BNB Price: $696.41 (-2.23%)
Gas: 1 GWei

Contract

0x0000000000000000000000000000000000001000
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BSC: Validator Set
 Source Code

Overview

BNB Balance

BNB Smart Chain LogoBNB Smart Chain LogoBNB Smart Chain Logo259.272764517740386609 BNB

BNB Value

$180,559.09 (@ $696.41/BNB)

Token Holdings

More Info

Private Name Tags

Add

ContractCreator

GENESIS at txn GENESIS_0000000000000000000000000000000000001000

Multichain Info

 Latest 25 from a total of 44,795,342 transactions

Transaction Hash
Method
Block
From
To
0x9f2ebfbc4aa308eb5783855c5a7d488017522c956a8103a6161dc045e53c5b63
Deposit453250692024-12-30 10:59:107 secs ago1735556350
Validator : defibit
IN
BSC: Validator Set
0.02009337 BNB00
0xc3a026170cd47c4caecb989680dfbd6d62c404828053a0ab3efc9c00ec3df106
Deposit453250682024-12-30 10:59:0710 secs ago1735556347
Validator : defibit
IN
BSC: Validator Set
0.01645475 BNB00
0x01376b6245d1f931f963c5aff30e9f5395eb4c3ddf44d9380953de72388f12e7
Deposit453250672024-12-30 10:59:0413 secs ago1735556344
Validator : Shannon
IN
BSC: Validator Set
0.0155492 BNB00
0xc96eff878e82c73a0447e50de110487aa522a7ceba6625f871e900a26b8bd59e
Deposit453250662024-12-30 10:59:0116 secs ago1735556341
Validator : Shannon
IN
BSC: Validator Set
0.01681084 BNB00
0x979acc9beb85530dd664453ada01d92e0b775d885df7aacd2691195dffdbb5de
Deposit453250652024-12-30 10:58:5819 secs ago1735556338
Validator : Shannon
IN
BSC: Validator Set
0.02052249 BNB00
0xc1258221a2233504c465e95e382e2294602295dfa3e5e2d1e0d98caa469e8d22
Deposit453250642024-12-30 10:58:5522 secs ago1735556335
Validator : Shannon
IN
BSC: Validator Set
0.01908659 BNB00
0x672582d546cbff7a25fbbb910eac124ada1a10ea31fbafb50740a8694ecd125c
Deposit453250632024-12-30 10:58:5225 secs ago1735556332
Validator : LegendII
IN
BSC: Validator Set
0.02135745 BNB00
0x28e53ef83907145e714178c165ddb4a9f94f2c9bae2ecb796f7125b067c02568
Deposit453250622024-12-30 10:58:4928 secs ago1735556329
Validator : LegendII
IN
BSC: Validator Set
0.01942206 BNB00
0x097b27b082ee94193d17c704e3ab8b94a357b375be120fbdc5970e78c752963d
Deposit453250612024-12-30 10:58:4631 secs ago1735556326
Validator : LegendII
IN
BSC: Validator Set
0.01332149 BNB00
0x41ee4433d6d25dc2b2f90586bebe7a99c4243372593c11f47af57524b8ae6305
Deposit453250602024-12-30 10:58:4334 secs ago1735556323
Validator : LegendII
IN
BSC: Validator Set
0.01826178 BNB00
0x43afe0171bdd634f888faa22e2d06eeaec96aa43bfae112be6f2d18afcaaddee
Deposit453250592024-12-30 10:58:4037 secs ago1735556320
Validator : Tranchess
IN
BSC: Validator Set
0.02124022 BNB00
0xd9c4fd4af62f0f5b4f9a6c6bde78d9af09c10a02fdc8a983ed8cfe17303e3730
Deposit453250582024-12-30 10:58:3740 secs ago1735556317
Validator : Tranchess
IN
BSC: Validator Set
0.01990376 BNB00
0x719c0cd9246d69e870a3ec5c76a70373252c99839fd345bfca62a587a71e03fc
Deposit453250572024-12-30 10:58:3443 secs ago1735556314
Validator : Tranchess
IN
BSC: Validator Set
0.01694823 BNB00
0x48196a2633cd4a4e585b6cba315bc8373ee93879ee60d9327fc03f02eb8bf100
Deposit453250562024-12-30 10:58:3146 secs ago1735556311
Validator : Tranchess
IN
BSC: Validator Set
0.02777693 BNB00
0xd23c80a1714658581409b35877149d2202ca23c7349768be1fa42c4c7e241041
Deposit453250552024-12-30 10:58:2849 secs ago1735556308
Validator : Aoraki
IN
BSC: Validator Set
0.02150812 BNB00
0x87ebaf403761df4ff0fe4e6951d48661e58c0820a8468fcc7a3f0a08a8b37309
Deposit453250542024-12-30 10:58:2552 secs ago1735556305
Validator : Aoraki
IN
BSC: Validator Set
0.01603294 BNB00
0x509901215e94701def9089f34a17e8a28b0f0690068be5a4a502895226fcf35a
Deposit453250532024-12-30 10:58:2255 secs ago1735556302
Validator : Aoraki
IN
BSC: Validator Set
0.01710958 BNB00
0x979bc3d14407a4f5f1d417f2ebd3bd51ad4dc8fe1e1c07973bee877d038554d4
Deposit453250522024-12-30 10:58:1958 secs ago1735556299
Validator : Aoraki
IN
BSC: Validator Set
0.01498764 BNB00
0x90aa0f81675e7e8b82addda41e047b19e841050d6a38000b40d56fae37316bfb
Deposit453250512024-12-30 10:58:161 min ago1735556296
Validator : namelix
IN
BSC: Validator Set
0.0196872 BNB00
0xdc82106bf56b4b6e76858acef77a9fd4051e0da72b3b0bea08d745bc72e66a2c
Deposit453250502024-12-30 10:58:131 min ago1735556293
Validator : namelix
IN
BSC: Validator Set
0.01492721 BNB00
0x3f8b2e89bb75df61fa72056b3554a14413937a7e1549e8a9bd80f57999424617
Deposit453250492024-12-30 10:58:101 min ago1735556290
Validator : namelix
IN
BSC: Validator Set
0.01564162 BNB00
0xda6c51a4799071b6421364e9fdc039f7af4ea2c83d968c4b2b9b0886fcfb2709
Deposit453250482024-12-30 10:58:071 min ago1735556287
Validator : namelix
IN
BSC: Validator Set
0.02442585 BNB00
0xb7acc716b70aaba4fb4b44070cbe5ffe2fb3d19a86dbf5f83d79a3c7e9dfe627
Deposit453250472024-12-30 10:58:041 min ago1735556284
Validator : Avengers
IN
BSC: Validator Set
0.02111183 BNB00
0xd9b644e61271a1d2d0251c01cabbfc8e6d9c18575836061c8acf24644c7b40a8
Deposit453250462024-12-30 10:58:011 min ago1735556281
Validator : Avengers
IN
BSC: Validator Set
0.01535476 BNB00
0xe195322d40858831da7fed7b933a27fcb124e1742ad580c4cd071cb3efcc5dfc
Deposit453250452024-12-30 10:57:581 min ago1735556278
Validator : Avengers
IN
BSC: Validator Set
0.01337155 BNB00
View all transactions

Latest 25 internal transactions (View All)

Parent Transaction Hash Block From To
0x979acc9beb85530dd664453ada01d92e0b775d885df7aacd2691195dffdbb5de
453250652024-12-30 10:58:5819 secs ago1735556338
BSC: Validator Set
Null: 0x000...dEaD
0.00205224 BNB
0x979acc9beb85530dd664453ada01d92e0b775d885df7aacd2691195dffdbb5de
453250652024-12-30 10:58:5819 secs ago1735556338
BSC: Validator Set
BSC: System Reward
0.00128265 BNB
0xc1258221a2233504c465e95e382e2294602295dfa3e5e2d1e0d98caa469e8d22
453250642024-12-30 10:58:5522 secs ago1735556335
BSC: Validator Set
Null: 0x000...dEaD
0.00190865 BNB
0xc1258221a2233504c465e95e382e2294602295dfa3e5e2d1e0d98caa469e8d22
453250642024-12-30 10:58:5522 secs ago1735556335
BSC: Validator Set
BSC: System Reward
0.00119291 BNB
0x672582d546cbff7a25fbbb910eac124ada1a10ea31fbafb50740a8694ecd125c
453250632024-12-30 10:58:5225 secs ago1735556332
BSC: Validator Set
Null: 0x000...dEaD
0.00213574 BNB
0x672582d546cbff7a25fbbb910eac124ada1a10ea31fbafb50740a8694ecd125c
453250632024-12-30 10:58:5225 secs ago1735556332
BSC: Validator Set
BSC: System Reward
0.00133484 BNB
0x28e53ef83907145e714178c165ddb4a9f94f2c9bae2ecb796f7125b067c02568
453250622024-12-30 10:58:4928 secs ago1735556329
BSC: Validator Set
Null: 0x000...dEaD
0.0019422 BNB
0x28e53ef83907145e714178c165ddb4a9f94f2c9bae2ecb796f7125b067c02568
453250622024-12-30 10:58:4928 secs ago1735556329
BSC: Validator Set
BSC: System Reward
0.00121387 BNB
0x097b27b082ee94193d17c704e3ab8b94a357b375be120fbdc5970e78c752963d
453250612024-12-30 10:58:4631 secs ago1735556326
BSC: Validator Set
Null: 0x000...dEaD
0.00133214 BNB
0x097b27b082ee94193d17c704e3ab8b94a357b375be120fbdc5970e78c752963d
453250612024-12-30 10:58:4631 secs ago1735556326
BSC: Validator Set
BSC: System Reward
0.00083259 BNB
0x41ee4433d6d25dc2b2f90586bebe7a99c4243372593c11f47af57524b8ae6305
453250602024-12-30 10:58:4334 secs ago1735556323
BSC: Validator Set
Null: 0x000...dEaD
0.00182617 BNB
0x41ee4433d6d25dc2b2f90586bebe7a99c4243372593c11f47af57524b8ae6305
453250602024-12-30 10:58:4334 secs ago1735556323
BSC: Validator Set
BSC: System Reward
0.00114136 BNB
0x43afe0171bdd634f888faa22e2d06eeaec96aa43bfae112be6f2d18afcaaddee
453250592024-12-30 10:58:4037 secs ago1735556320
BSC: Validator Set
Null: 0x000...dEaD
0.00212402 BNB
0x43afe0171bdd634f888faa22e2d06eeaec96aa43bfae112be6f2d18afcaaddee
453250592024-12-30 10:58:4037 secs ago1735556320
BSC: Validator Set
BSC: System Reward
0.00132751 BNB
0xd9c4fd4af62f0f5b4f9a6c6bde78d9af09c10a02fdc8a983ed8cfe17303e3730
453250582024-12-30 10:58:3740 secs ago1735556317
BSC: Validator Set
Null: 0x000...dEaD
0.00199037 BNB
0xd9c4fd4af62f0f5b4f9a6c6bde78d9af09c10a02fdc8a983ed8cfe17303e3730
453250582024-12-30 10:58:3740 secs ago1735556317
BSC: Validator Set
BSC: System Reward
0.00124398 BNB
0x719c0cd9246d69e870a3ec5c76a70373252c99839fd345bfca62a587a71e03fc
453250572024-12-30 10:58:3443 secs ago1735556314
BSC: Validator Set
Null: 0x000...dEaD
0.00169482 BNB
0x719c0cd9246d69e870a3ec5c76a70373252c99839fd345bfca62a587a71e03fc
453250572024-12-30 10:58:3443 secs ago1735556314
BSC: Validator Set
BSC: System Reward
0.00105926 BNB
0x48196a2633cd4a4e585b6cba315bc8373ee93879ee60d9327fc03f02eb8bf100
453250562024-12-30 10:58:3146 secs ago1735556311
BSC: Validator Set
Null: 0x000...dEaD
0.00277769 BNB
0x48196a2633cd4a4e585b6cba315bc8373ee93879ee60d9327fc03f02eb8bf100
453250562024-12-30 10:58:3146 secs ago1735556311
BSC: Validator Set
BSC: System Reward
0.00173605 BNB
0xd23c80a1714658581409b35877149d2202ca23c7349768be1fa42c4c7e241041
453250552024-12-30 10:58:2849 secs ago1735556308
BSC: Validator Set
Null: 0x000...dEaD
0.00215081 BNB
0xd23c80a1714658581409b35877149d2202ca23c7349768be1fa42c4c7e241041
453250552024-12-30 10:58:2849 secs ago1735556308
BSC: Validator Set
BSC: System Reward
0.00134425 BNB
0x87ebaf403761df4ff0fe4e6951d48661e58c0820a8468fcc7a3f0a08a8b37309
453250542024-12-30 10:58:2552 secs ago1735556305
BSC: Validator Set
Null: 0x000...dEaD
0.00160329 BNB
0x87ebaf403761df4ff0fe4e6951d48661e58c0820a8468fcc7a3f0a08a8b37309
453250542024-12-30 10:58:2552 secs ago1735556305
BSC: Validator Set
BSC: System Reward
0.00100205 BNB
0x509901215e94701def9089f34a17e8a28b0f0690068be5a4a502895226fcf35a
453250532024-12-30 10:58:2255 secs ago1735556302
BSC: Validator Set
Null: 0x000...dEaD
0.00171095 BNB
View All Internal Transactions
Loading

Contract Source Code Verified (Genesis Bytecode Match Only)

Contract Name:
BSCValidatorSet
Compiler Version
v0.6.4+commit.1dca32f3
Optimization Enabled:
Yes with 200 runs
Other Settings:
default evmVersion

Contract Source Code (Solidity)

blockscan-logoblockscan-logoblockscan-logoIDE
/**
 *Submitted for verification at BscScan.com on 2020-09-02
*/

pragma solidity =0.6.4;
pragma experimental ABIEncoderV2;

// contracts/interface/IApplication.sol

interface IApplication {
    /**
     * @dev Handle syn package
     */
    function handleSynPackage(
        uint8 channelId,
        bytes calldata msgBytes
    ) external returns (bytes memory responsePayload);

    /**
     * @dev Handle ack package
     */
    function handleAckPackage(uint8 channelId, bytes calldata msgBytes) external;

    /**
     * @dev Handle fail ack package
     */
    function handleFailAckPackage(uint8 channelId, bytes calldata msgBytes) external;
}

// contracts/interface/IBSCValidatorSet.sol

interface IBSCValidatorSet {
    function misdemeanor(address validator) external;
    function felony(address validator) external;
    function isCurrentValidator(address validator) external view returns (bool);
    function getLivingValidators() external view returns (address[] memory, bytes[] memory);
    function getMiningValidators() external view returns (address[] memory, bytes[] memory);
    function isMonitoredForMaliciousVote(bytes calldata voteAddr) external view returns (bool);
}

// contracts/interface/ILightClient.sol

interface ILightClient {
    function isHeaderSynced(uint64 height) external view returns (bool);

    function getAppHash(uint64 height) external view returns (bytes32);

    function getSubmitter(uint64 height) external view returns (address payable);
}

// contracts/interface/IParamSubscriber.sol

interface IParamSubscriber {
    function updateParam(string calldata key, bytes calldata value) external;
}

// contracts/interface/IRelayerHub.sol

interface IRelayerHub {
    function isRelayer(address sender) external view returns (bool);
}

// contracts/interface/ISlashIndicator.sol

interface ISlashIndicator {
    function clean() external;
    function downtimeSlash(address validator, uint256 count) external;
    function sendFelonyPackage(address validator) external;
    function getSlashThresholds() external view returns (uint256, uint256);
}

// contracts/interface/IStakeHub.sol

interface IStakeHub {
    function downtimeSlash(address validator) external;
    function maliciousVoteSlash(bytes calldata voteAddress) external;
    function doubleSignSlash(address validator) external;
    function voteToOperator(bytes calldata voteAddress) external view returns (address);
    function consensusToOperator(address validator) external view returns (address);
    function getValidatorConsensusAddress(address validator) external view returns (address);
    function getValidatorCreditContract(address validator) external view returns (address);
    function getValidatorVoteAddress(address validator) external view returns (bytes memory);
    function maxElectedValidators() external view returns (uint256);
    function distributeReward(address validator) external payable;
}

// contracts/interface/ISystemReward.sol

interface ISystemReward {
    function claimRewards(address payable to, uint256 amount) external returns (uint256 actualAmount);
}

// contracts/interface/ITokenHub.sol

interface ITokenHub {
    function getMiniRelayFee() external view returns (uint256);

    function getContractAddrByBEP2Symbol(bytes32 bep2Symbol) external view returns (address);

    function getBep2SymbolByContractAddr(address contractAddr) external view returns (bytes32);

    function bindToken(bytes32 bep2Symbol, address contractAddr, uint256 decimals) external;

    function unbindToken(bytes32 bep2Symbol, address contractAddr) external;

    function transferOut(
        address contractAddr,
        address recipient,
        uint256 amount,
        uint64 expireTime
    ) external payable returns (bool);

    function recoverBCAsset(bytes32 tokenSymbol, address recipient, uint256 amount) external;
    function cancelTokenRecoverLock(bytes32 tokenSymbol, address attacker) external;

    /* solium-disable-next-line */
    function batchTransferOutBNB(
        address[] calldata recipientAddrs,
        uint256[] calldata amounts,
        address[] calldata refundAddrs,
        uint64 expireTime
    ) external payable returns (bool);

    function withdrawStakingBNB(uint256 amount) external returns (bool);

    function cancelTransferIn(address tokenAddress, address attacker) external;
}

// contracts/lib/BytesLib.sol
/*
 * @title Solidity Bytes Arrays Utils
 * @author Gonçalo Sá <[email protected]>
 * Copyright (c) 2016-2020 zpouladzade/Seriality
 * @dev Bytes tightly packed arrays utility library for ethereum contracts written in Solidity.
 *      The library lets you concatenate, slice and type cast bytes arrays both in memory and storage.
 */

library BytesLib {
    function concat(bytes memory _preBytes, bytes memory _postBytes) internal pure returns (bytes memory) {
        bytes memory tempBytes;

        assembly {
            // Get a location of some free memory and store it in tempBytes as
            // Solidity does for memory variables.
            tempBytes := mload(0x40)

            // Store the length of the first bytes array at the beginning of
            // the memory for tempBytes.
            let length := mload(_preBytes)
            mstore(tempBytes, length)

            // Maintain a memory counter for the current write location in the
            // temp bytes array by adding the 32 bytes for the array length to
            // the starting location.
            let mc := add(tempBytes, 0x20)
            // Stop copying when the memory counter reaches the length of the
            // first bytes array.
            let end := add(mc, length)

            for {
                // Initialize a copy counter to the start of the _preBytes data,
                // 32 bytes into its memory.
                let cc := add(_preBytes, 0x20)
            } lt(mc, end) {
                // Increase both counters by 32 bytes each iteration.
                mc := add(mc, 0x20)
                cc := add(cc, 0x20)
            } {
                // Write the _preBytes data into the tempBytes memory 32 bytes
                // at a time.
                mstore(mc, mload(cc))
            }

            // Add the length of _postBytes to the current length of tempBytes
            // and store it as the new length in the first 32 bytes of the
            // tempBytes memory.
            length := mload(_postBytes)
            mstore(tempBytes, add(length, mload(tempBytes)))

            // Move the memory counter back from a multiple of 0x20 to the
            // actual end of the _preBytes data.
            mc := end
            // Stop copying when the memory counter reaches the new combined
            // length of the arrays.
            end := add(mc, length)

            for { let cc := add(_postBytes, 0x20) } lt(mc, end) {
                mc := add(mc, 0x20)
                cc := add(cc, 0x20)
            } { mstore(mc, mload(cc)) }

            // Update the free-memory pointer by padding our last write location
            // to 32 bytes: add 31 bytes to the end of tempBytes to move to the
            // next 32 byte block, then round down to the nearest multiple of
            // 32. If the sum of the length of the two arrays is zero then add
            // one before rounding down to leave a blank 32 bytes (the length block with 0).
            mstore(
                0x40,
                and(
                    add(add(end, iszero(add(length, mload(_preBytes)))), 31),
                    not(31) // Round down to the nearest 32 bytes.
                )
            )
        }

        return tempBytes;
    }

    function concatStorage(bytes storage _preBytes, bytes memory _postBytes) internal {
        assembly {
            // Read the first 32 bytes of _preBytes storage, which is the length
            // of the array. (We don't need to use the offset into the slot
            // because arrays use the entire slot.)
            let fslot := sload(_preBytes_slot)
            // Arrays of 31 bytes or less have an even value in their slot,
            // while longer arrays have an odd value. The actual length is
            // the slot divided by two for odd values, and the lowest order
            // byte divided by two for even values.
            // If the slot is even, bitwise and the slot with 255 and divide by
            // two to get the length. If the slot is odd, bitwise and the slot
            // with -1 and divide by two.
            let slength := div(and(fslot, sub(mul(0x100, iszero(and(fslot, 1))), 1)), 2)
            let mlength := mload(_postBytes)
            let newlength := add(slength, mlength)
            // slength can contain both the length and contents of the array
            // if length < 32 bytes so let's prepare for that
            // v. http://solidity.readthedocs.io/en/latest/miscellaneous.html#layout-of-state-variables-in-storage
            switch add(lt(slength, 32), lt(newlength, 32))
            case 2 {
                // Since the new array still fits in the slot, we just need to
                // update the contents of the slot.
                // uint256(bytes_storage) = uint256(bytes_storage) + uint256(bytes_memory) + new_length
                sstore(
                    _preBytes_slot,
                    // all the modifications to the slot are inside this
                    // next block
                    add(
                        // we can just add to the slot contents because the
                        // bytes we want to change are the LSBs
                        fslot,
                        add(
                            mul(
                                div(
                                    // load the bytes from memory
                                    mload(add(_postBytes, 0x20)),
                                    // zero all bytes to the right
                                    exp(0x100, sub(32, mlength))
                                ),
                                // and now shift left the number of bytes to
                                // leave space for the length in the slot
                                exp(0x100, sub(32, newlength))
                            ),
                            // increase length by the double of the memory
                            // bytes length
                            mul(mlength, 2)
                        )
                    )
                )
            }
            case 1 {
                // The stored value fits in the slot, but the combined value
                // will exceed it.
                // get the keccak hash to get the contents of the array
                mstore(0x0, _preBytes_slot)
                let sc := add(keccak256(0x0, 0x20), div(slength, 32))

                // save new length
                sstore(_preBytes_slot, add(mul(newlength, 2), 1))

                // The contents of the _postBytes array start 32 bytes into
                // the structure. Our first read should obtain the `submod`
                // bytes that can fit into the unused space in the last word
                // of the stored array. To get this, we read 32 bytes starting
                // from `submod`, so the data we read overlaps with the array
                // contents by `submod` bytes. Masking the lowest-order
                // `submod` bytes allows us to add that value directly to the
                // stored value.

                let submod := sub(32, slength)
                let mc := add(_postBytes, submod)
                let end := add(_postBytes, mlength)
                let mask := sub(exp(0x100, submod), 1)

                sstore(
                    sc,
                    add(
                        and(fslot, 0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff00),
                        and(mload(mc), mask)
                    )
                )

                for {
                    mc := add(mc, 0x20)
                    sc := add(sc, 1)
                } lt(mc, end) {
                    sc := add(sc, 1)
                    mc := add(mc, 0x20)
                } { sstore(sc, mload(mc)) }

                mask := exp(0x100, sub(mc, end))

                sstore(sc, mul(div(mload(mc), mask), mask))
            }
            default {
                // get the keccak hash to get the contents of the array
                mstore(0x0, _preBytes_slot)
                // Start copying to the last used word of the stored array.
                let sc := add(keccak256(0x0, 0x20), div(slength, 32))

                // save new length
                sstore(_preBytes_slot, add(mul(newlength, 2), 1))

                // Copy over the first `submod` bytes of the new data as in
                // case 1 above.
                let slengthmod := mod(slength, 32)
                let mlengthmod := mod(mlength, 32)
                let submod := sub(32, slengthmod)
                let mc := add(_postBytes, submod)
                let end := add(_postBytes, mlength)
                let mask := sub(exp(0x100, submod), 1)

                sstore(sc, add(sload(sc), and(mload(mc), mask)))

                for {
                    sc := add(sc, 1)
                    mc := add(mc, 0x20)
                } lt(mc, end) {
                    sc := add(sc, 1)
                    mc := add(mc, 0x20)
                } { sstore(sc, mload(mc)) }

                mask := exp(0x100, sub(mc, end))

                sstore(sc, mul(div(mload(mc), mask), mask))
            }
        }
    }

    function slice(bytes memory _bytes, uint256 _start, uint256 _length) internal pure returns (bytes memory) {
        require(_bytes.length >= (_start + _length));

        bytes memory tempBytes;

        assembly {
            switch iszero(_length)
            case 0 {
                // Get a location of some free memory and store it in tempBytes as
                // Solidity does for memory variables.
                tempBytes := mload(0x40)

                // The first word of the slice result is potentially a partial
                // word read from the original array. To read it, we calculate
                // the length of that partial word and start copying that many
                // bytes into the array. The first word we copy will start with
                // data we don't care about, but the last `lengthmod` bytes will
                // land at the beginning of the contents of the new array. When
                // we're done copying, we overwrite the full first word with
                // the actual length of the slice.
                let lengthmod := and(_length, 31)

                // The multiplication in the next line is necessary
                // because when slicing multiples of 32 bytes (lengthmod == 0)
                // the following copy loop was copying the origin's length
                // and then ending prematurely not copying everything it should.
                let mc := add(add(tempBytes, lengthmod), mul(0x20, iszero(lengthmod)))
                let end := add(mc, _length)

                for {
                    // The multiplication in the next line has the same exact purpose
                    // as the one above.
                    let cc := add(add(add(_bytes, lengthmod), mul(0x20, iszero(lengthmod))), _start)
                } lt(mc, end) {
                    mc := add(mc, 0x20)
                    cc := add(cc, 0x20)
                } { mstore(mc, mload(cc)) }

                mstore(tempBytes, _length)

                //update free-memory pointer
                //allocating the array padded to 32 bytes like the compiler does now
                mstore(0x40, and(add(mc, 31), not(31)))
            }
            //if we want a zero-length slice let's just return a zero-length array
            default {
                tempBytes := mload(0x40)

                mstore(0x40, add(tempBytes, 0x20))
            }
        }

        return tempBytes;
    }

    function toAddress(bytes memory _bytes, uint256 _start) internal pure returns (address) {
        require(_bytes.length >= (_start + 20));
        address tempAddress;

        assembly {
            tempAddress := div(mload(add(add(_bytes, 0x20), _start)), 0x1000000000000000000000000)
        }

        return tempAddress;
    }

    function toUint8(bytes memory _bytes, uint256 _start) internal pure returns (uint8) {
        require(_bytes.length >= (_start + 1));
        uint8 tempUint;

        assembly {
            tempUint := mload(add(add(_bytes, 0x1), _start))
        }

        return tempUint;
    }

    function toUint16(bytes memory _bytes, uint256 _start) internal pure returns (uint16) {
        require(_bytes.length >= (_start + 2));
        uint16 tempUint;

        assembly {
            tempUint := mload(add(add(_bytes, 0x2), _start))
        }

        return tempUint;
    }

    function toUint32(bytes memory _bytes, uint256 _start) internal pure returns (uint32) {
        require(_bytes.length >= (_start + 4));
        uint32 tempUint;

        assembly {
            tempUint := mload(add(add(_bytes, 0x4), _start))
        }

        return tempUint;
    }

    function toUint64(bytes memory _bytes, uint256 _start) internal pure returns (uint64) {
        require(_bytes.length >= (_start + 8));
        uint64 tempUint;

        assembly {
            tempUint := mload(add(add(_bytes, 0x8), _start))
        }

        return tempUint;
    }

    function toUint96(bytes memory _bytes, uint256 _start) internal pure returns (uint96) {
        require(_bytes.length >= (_start + 12));
        uint96 tempUint;

        assembly {
            tempUint := mload(add(add(_bytes, 0xc), _start))
        }

        return tempUint;
    }

    function toUint128(bytes memory _bytes, uint256 _start) internal pure returns (uint128) {
        require(_bytes.length >= (_start + 16));
        uint128 tempUint;

        assembly {
            tempUint := mload(add(add(_bytes, 0x10), _start))
        }

        return tempUint;
    }

    function toUint(bytes memory _bytes, uint256 _start) internal pure returns (uint256) {
        require(_bytes.length >= (_start + 32));
        uint256 tempUint;

        assembly {
            tempUint := mload(add(add(_bytes, 0x20), _start))
        }

        return tempUint;
    }

    function toBytes32(bytes memory _bytes, uint256 _start) internal pure returns (bytes32) {
        require(_bytes.length >= (_start + 32));
        bytes32 tempBytes32;

        assembly {
            tempBytes32 := mload(add(add(_bytes, 0x20), _start))
        }

        return tempBytes32;
    }

    function equal(bytes memory _preBytes, bytes memory _postBytes) internal pure returns (bool) {
        bool success = true;

        assembly {
            let length := mload(_preBytes)

            // if lengths don't match the arrays are not equal
            switch eq(length, mload(_postBytes))
            case 1 {
                // cb is a circuit breaker in the for loop since there's
                //  no said feature for inline assembly loops
                // cb = 1 - don't breaker
                // cb = 0 - break
                let cb := 1

                let mc := add(_preBytes, 0x20)
                let end := add(mc, length)

                for { let cc := add(_postBytes, 0x20) }
                // the next line is the loop condition:
                // while (uint(mc < end) + cb == 2)
                eq(add(lt(mc, end), cb), 2) {
                    mc := add(mc, 0x20)
                    cc := add(cc, 0x20)
                } {
                    // if any of these checks fails then arrays are not equal
                    if iszero(eq(mload(mc), mload(cc))) {
                        // unsuccess:
                        success := 0
                        cb := 0
                    }
                }
            }
            default {
                // unsuccess:
                success := 0
            }
        }

        return success;
    }

    function equalStorage(bytes storage _preBytes, bytes memory _postBytes) internal view returns (bool) {
        bool success = true;

        assembly {
            // we know _preBytes_offset is 0
            let fslot := sload(_preBytes_slot)
            // Decode the length of the stored array like in concatStorage().
            let slength := div(and(fslot, sub(mul(0x100, iszero(and(fslot, 1))), 1)), 2)
            let mlength := mload(_postBytes)

            // if lengths don't match the arrays are not equal
            switch eq(slength, mlength)
            case 1 {
                // slength can contain both the length and contents of the array
                // if length < 32 bytes so let's prepare for that
                // v. http://solidity.readthedocs.io/en/latest/miscellaneous.html#layout-of-state-variables-in-storage
                if iszero(iszero(slength)) {
                    switch lt(slength, 32)
                    case 1 {
                        // blank the last byte which is the length
                        fslot := mul(div(fslot, 0x100), 0x100)

                        if iszero(eq(fslot, mload(add(_postBytes, 0x20)))) {
                            // unsuccess:
                            success := 0
                        }
                    }
                    default {
                        // cb is a circuit breaker in the for loop since there's
                        //  no said feature for inline assembly loops
                        // cb = 1 - don't breaker
                        // cb = 0 - break
                        let cb := 1

                        // get the keccak hash to get the contents of the array
                        mstore(0x0, _preBytes_slot)
                        let sc := keccak256(0x0, 0x20)

                        let mc := add(_postBytes, 0x20)
                        let end := add(mc, mlength)

                        // the next line is the loop condition:
                        // while (uint(mc < end) + cb == 2)
                        for { } eq(add(lt(mc, end), cb), 2) {
                            sc := add(sc, 1)
                            mc := add(mc, 0x20)
                        } {
                            if iszero(eq(sload(sc), mload(mc))) {
                                // unsuccess:
                                success := 0
                                cb := 0
                            }
                        }
                    }
                }
            }
            default {
                // unsuccess:
                success := 0
            }
        }

        return success;
    }
}

// contracts/lib/BytesToTypes.sol

/**
 * @title BytesToTypes
 * Copyright (c) 2016-2020 zpouladzade/Seriality
 * @dev The BytesToTypes contract converts the memory byte arrays to the standard solidity types
 * @author [email protected]
 */
library BytesToTypes {
    function bytesToAddress(uint256 _offst, bytes memory _input) internal pure returns (address _output) {
        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToBool(uint256 _offst, bytes memory _input) internal pure returns (bool _output) {
        uint8 x;
        assembly {
            x := mload(add(_input, _offst))
        }
        x == 0 ? _output = false : _output = true;
    }

    function getStringSize(uint256 _offst, bytes memory _input) internal pure returns (uint256 size) {
        assembly {
            size := mload(add(_input, _offst))
            let chunk_count := add(div(size, 32), 1) // chunk_count = size/32 + 1

            if gt(mod(size, 32), 0) {
                // if size%32 > 0
                chunk_count := add(chunk_count, 1)
            }

            size := mul(chunk_count, 32) // first 32 bytes reseves for size in strings
        }
    }

    function bytesToString(uint256 _offst, bytes memory _input, bytes memory _output) internal pure {
        uint256 size = 32;
        assembly {
            let chunk_count

            size := mload(add(_input, _offst))
            chunk_count := add(div(size, 32), 1) // chunk_count = size/32 + 1

            if gt(mod(size, 32), 0) { chunk_count := add(chunk_count, 1) } // chunk_count++

            for { let index := 0 } lt(index, chunk_count) { index := add(index, 1) } {
                mstore(add(_output, mul(index, 32)), mload(add(_input, _offst)))
                _offst := sub(_offst, 32) // _offst -= 32
            }
        }
    }

    function bytesToBytes32(uint256 _offst, bytes memory _input, bytes32 _output) internal pure {
        assembly {
            mstore(_output, add(_input, _offst))
            mstore(add(_output, 32), add(add(_input, _offst), 32))
        }
    }

    function bytesToInt8(uint256 _offst, bytes memory _input) internal pure returns (int8 _output) {
        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToInt16(uint256 _offst, bytes memory _input) internal pure returns (int16 _output) {
        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToInt24(uint256 _offst, bytes memory _input) internal pure returns (int24 _output) {
        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToInt32(uint256 _offst, bytes memory _input) internal pure returns (int32 _output) {
        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToInt40(uint256 _offst, bytes memory _input) internal pure returns (int40 _output) {
        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToInt48(uint256 _offst, bytes memory _input) internal pure returns (int48 _output) {
        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToInt56(uint256 _offst, bytes memory _input) internal pure returns (int56 _output) {
        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToInt64(uint256 _offst, bytes memory _input) internal pure returns (int64 _output) {
        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToInt72(uint256 _offst, bytes memory _input) internal pure returns (int72 _output) {
        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToInt80(uint256 _offst, bytes memory _input) internal pure returns (int80 _output) {
        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToInt88(uint256 _offst, bytes memory _input) internal pure returns (int88 _output) {
        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToInt96(uint256 _offst, bytes memory _input) internal pure returns (int96 _output) {
        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToInt104(uint256 _offst, bytes memory _input) internal pure returns (int104 _output) {
        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToInt112(uint256 _offst, bytes memory _input) internal pure returns (int112 _output) {
        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToInt120(uint256 _offst, bytes memory _input) internal pure returns (int120 _output) {
        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToInt128(uint256 _offst, bytes memory _input) internal pure returns (int128 _output) {
        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToInt136(uint256 _offst, bytes memory _input) internal pure returns (int136 _output) {
        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToInt144(uint256 _offst, bytes memory _input) internal pure returns (int144 _output) {
        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToInt152(uint256 _offst, bytes memory _input) internal pure returns (int152 _output) {
        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToInt160(uint256 _offst, bytes memory _input) internal pure returns (int160 _output) {
        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToInt168(uint256 _offst, bytes memory _input) internal pure returns (int168 _output) {
        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToInt176(uint256 _offst, bytes memory _input) internal pure returns (int176 _output) {
        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToInt184(uint256 _offst, bytes memory _input) internal pure returns (int184 _output) {
        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToInt192(uint256 _offst, bytes memory _input) internal pure returns (int192 _output) {
        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToInt200(uint256 _offst, bytes memory _input) internal pure returns (int200 _output) {
        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToInt208(uint256 _offst, bytes memory _input) internal pure returns (int208 _output) {
        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToInt216(uint256 _offst, bytes memory _input) internal pure returns (int216 _output) {
        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToInt224(uint256 _offst, bytes memory _input) internal pure returns (int224 _output) {
        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToInt232(uint256 _offst, bytes memory _input) internal pure returns (int232 _output) {
        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToInt240(uint256 _offst, bytes memory _input) internal pure returns (int240 _output) {
        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToInt248(uint256 _offst, bytes memory _input) internal pure returns (int248 _output) {
        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToInt256(uint256 _offst, bytes memory _input) internal pure returns (int256 _output) {
        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToUint8(uint256 _offst, bytes memory _input) internal pure returns (uint8 _output) {
        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToUint16(uint256 _offst, bytes memory _input) internal pure returns (uint16 _output) {
        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToUint24(uint256 _offst, bytes memory _input) internal pure returns (uint24 _output) {
        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToUint32(uint256 _offst, bytes memory _input) internal pure returns (uint32 _output) {
        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToUint40(uint256 _offst, bytes memory _input) internal pure returns (uint40 _output) {
        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToUint48(uint256 _offst, bytes memory _input) internal pure returns (uint48 _output) {
        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToUint56(uint256 _offst, bytes memory _input) internal pure returns (uint56 _output) {
        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToUint64(uint256 _offst, bytes memory _input) internal pure returns (uint64 _output) {
        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToUint72(uint256 _offst, bytes memory _input) internal pure returns (uint72 _output) {
        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToUint80(uint256 _offst, bytes memory _input) internal pure returns (uint80 _output) {
        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToUint88(uint256 _offst, bytes memory _input) internal pure returns (uint88 _output) {
        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToUint96(uint256 _offst, bytes memory _input) internal pure returns (uint96 _output) {
        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToUint104(uint256 _offst, bytes memory _input) internal pure returns (uint104 _output) {
        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToUint112(uint256 _offst, bytes memory _input) internal pure returns (uint112 _output) {
        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToUint120(uint256 _offst, bytes memory _input) internal pure returns (uint120 _output) {
        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToUint128(uint256 _offst, bytes memory _input) internal pure returns (uint128 _output) {
        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToUint136(uint256 _offst, bytes memory _input) internal pure returns (uint136 _output) {
        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToUint144(uint256 _offst, bytes memory _input) internal pure returns (uint144 _output) {
        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToUint152(uint256 _offst, bytes memory _input) internal pure returns (uint152 _output) {
        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToUint160(uint256 _offst, bytes memory _input) internal pure returns (uint160 _output) {
        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToUint168(uint256 _offst, bytes memory _input) internal pure returns (uint168 _output) {
        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToUint176(uint256 _offst, bytes memory _input) internal pure returns (uint176 _output) {
        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToUint184(uint256 _offst, bytes memory _input) internal pure returns (uint184 _output) {
        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToUint192(uint256 _offst, bytes memory _input) internal pure returns (uint192 _output) {
        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToUint200(uint256 _offst, bytes memory _input) internal pure returns (uint200 _output) {
        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToUint208(uint256 _offst, bytes memory _input) internal pure returns (uint208 _output) {
        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToUint216(uint256 _offst, bytes memory _input) internal pure returns (uint216 _output) {
        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToUint224(uint256 _offst, bytes memory _input) internal pure returns (uint224 _output) {
        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToUint232(uint256 _offst, bytes memory _input) internal pure returns (uint232 _output) {
        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToUint240(uint256 _offst, bytes memory _input) internal pure returns (uint240 _output) {
        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToUint248(uint256 _offst, bytes memory _input) internal pure returns (uint248 _output) {
        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToUint256(uint256 _offst, bytes memory _input) internal pure returns (uint256 _output) {
        assembly {
            _output := mload(add(_input, _offst))
        }
    }
}

// contracts/lib/Memory.sol

library Memory {
    // Size of a word, in bytes.
    uint256 internal constant WORD_SIZE = 32;
    // Size of the header of a 'bytes' array.
    uint256 internal constant BYTES_HEADER_SIZE = 32;
    // Address of the free memory pointer.
    uint256 internal constant FREE_MEM_PTR = 0x40;

    // Compares the 'len' bytes starting at address 'addr' in memory with the 'len'
    // bytes starting at 'addr2'.
    // Returns 'true' if the bytes are the same, otherwise 'false'.
    function equals(uint256 addr, uint256 addr2, uint256 len) internal pure returns (bool equal) {
        assembly {
            equal := eq(keccak256(addr, len), keccak256(addr2, len))
        }
    }

    // Compares the 'len' bytes starting at address 'addr' in memory with the bytes stored in
    // 'bts'. It is allowed to set 'len' to a lower value then 'bts.length', in which case only
    // the first 'len' bytes will be compared.
    // Requires that 'bts.length >= len'
    function equals(uint256 addr, uint256 len, bytes memory bts) internal pure returns (bool equal) {
        require(bts.length >= len);
        uint256 addr2;
        assembly {
            addr2 := add(bts, /*BYTES_HEADER_SIZE*/ 32)
        }
        return equals(addr, addr2, len);
    }

    function compareStrings(string memory a, string memory b) internal pure returns (bool) {
        return (keccak256(abi.encodePacked((a))) == keccak256(abi.encodePacked((b))));
    }

    // Copy 'len' bytes from memory address 'src', to address 'dest'.
    // This function does not check the or destination, it only copies
    // the bytes.
    function copy(uint256 src, uint256 dest, uint256 len) internal pure {
        // Copy word-length chunks while possible
        for (; len >= WORD_SIZE; len -= WORD_SIZE) {
            assembly {
                mstore(dest, mload(src))
            }
            dest += WORD_SIZE;
            src += WORD_SIZE;
        }

        // Copy remaining bytes
        uint256 mask = 256 ** (WORD_SIZE - len) - 1;
        assembly {
            let srcpart := and(mload(src), not(mask))
            let destpart := and(mload(dest), mask)
            mstore(dest, or(destpart, srcpart))
        }
    }

    // Returns a memory pointer to the provided bytes array.
    function ptr(bytes memory bts) internal pure returns (uint256 addr) {
        assembly {
            addr := bts
        }
    }

    // Returns a memory pointer to the data portion of the provided bytes array.
    function dataPtr(bytes memory bts) internal pure returns (uint256 addr) {
        assembly {
            addr := add(bts, /*BYTES_HEADER_SIZE*/ 32)
        }
    }

    // This function does the same as 'dataPtr(bytes memory)', but will also return the
    // length of the provided bytes array.
    function fromBytes(bytes memory bts) internal pure returns (uint256 addr, uint256 len) {
        len = bts.length;
        assembly {
            addr := add(bts, /*BYTES_HEADER_SIZE*/ 32)
        }
    }

    // Creates a 'bytes memory' variable from the memory address 'addr', with the
    // length 'len'. The function will allocate new memory for the bytes array, and
    // the 'len bytes starting at 'addr' will be copied into that new memory.
    function toBytes(uint256 addr, uint256 len) internal pure returns (bytes memory bts) {
        bts = new bytes(len);
        uint256 btsptr;
        assembly {
            btsptr := add(bts, /*BYTES_HEADER_SIZE*/ 32)
        }
        copy(addr, btsptr, len);
    }

    // Get the word stored at memory address 'addr' as a 'uint'.
    function toUint(uint256 addr) internal pure returns (uint256 n) {
        assembly {
            n := mload(addr)
        }
    }

    // Get the word stored at memory address 'addr' as a 'bytes32'.
    function toBytes32(uint256 addr) internal pure returns (bytes32 bts) {
        assembly {
            bts := mload(addr)
        }
    }
}

// contracts/lib/RLPDecode.sol

library RLPDecode {
    uint8 constant STRING_SHORT_START = 0x80;
    uint8 constant STRING_LONG_START = 0xb8;
    uint8 constant LIST_SHORT_START = 0xc0;
    uint8 constant LIST_LONG_START = 0xf8;

    uint8 constant WORD_SIZE = 32;

    struct RLPItem {
        uint256 len;
        uint256 memPtr;
    }

    struct Iterator {
        RLPItem item; // Item that's being iterated over.
        uint256 nextPtr; // Position of the next item in the list.
    }

    function next(Iterator memory self) internal pure returns (RLPItem memory) {
        require(hasNext(self));

        uint256 ptr = self.nextPtr;
        uint256 itemLength = _itemLength(ptr);
        self.nextPtr = ptr + itemLength;

        return RLPItem(itemLength, ptr);
    }

    function hasNext(Iterator memory self) internal pure returns (bool) {
        RLPItem memory item = self.item;
        return self.nextPtr < item.memPtr + item.len;
    }

    function toRLPItem(bytes memory self) internal pure returns (RLPItem memory) {
        uint256 memPtr;
        assembly {
            memPtr := add(self, 0x20)
        }

        return RLPItem(self.length, memPtr);
    }

    function iterator(RLPItem memory self) internal pure returns (Iterator memory) {
        require(isList(self));

        uint256 ptr = self.memPtr + _payloadOffset(self.memPtr);
        return Iterator(self, ptr);
    }

    function rlpLen(RLPItem memory item) internal pure returns (uint256) {
        return item.len;
    }

    function payloadLen(RLPItem memory item) internal pure returns (uint256) {
        return item.len - _payloadOffset(item.memPtr);
    }

    function toList(RLPItem memory item) internal pure returns (RLPItem[] memory) {
        require(isList(item));

        uint256 items = numItems(item);
        RLPItem[] memory result = new RLPItem[](items);

        uint256 memPtr = item.memPtr + _payloadOffset(item.memPtr);
        uint256 dataLen;
        for (uint256 i = 0; i < items; ++i) {
            dataLen = _itemLength(memPtr);
            result[i] = RLPItem(dataLen, memPtr);
            memPtr = memPtr + dataLen;
        }

        return result;
    }

    function isList(RLPItem memory item) internal pure returns (bool) {
        if (item.len == 0) return false;

        uint8 byte0;
        uint256 memPtr = item.memPtr;
        assembly {
            byte0 := byte(0, mload(memPtr))
        }

        if (byte0 < LIST_SHORT_START) {
            return false;
        }
        return true;
    }

    function toRlpBytes(RLPItem memory item) internal pure returns (bytes memory) {
        bytes memory result = new bytes(item.len);
        if (result.length == 0) return result;

        uint256 ptr;
        assembly {
            ptr := add(0x20, result)
        }

        copy(item.memPtr, ptr, item.len);
        return result;
    }

    function toBoolean(RLPItem memory item) internal pure returns (bool) {
        require(item.len == 1);
        uint256 result;
        uint256 memPtr = item.memPtr;
        assembly {
            result := byte(0, mload(memPtr))
        }

        if (result == 0 || result == STRING_SHORT_START) {
            return false;
        } else {
            return true;
        }
    }

    function toAddress(RLPItem memory item) internal pure returns (address) {
        // 1 byte for the length prefix
        require(item.len == 21);

        return address(toUint(item));
    }

    function toUint(RLPItem memory item) internal pure returns (uint256) {
        require(item.len > 0 && item.len <= 33);

        uint256 offset = _payloadOffset(item.memPtr);
        require(item.len >= offset, "length is less than offset");
        uint256 len = item.len - offset;

        uint256 result;
        uint256 memPtr = item.memPtr + offset;
        assembly {
            result := mload(memPtr)

            // shfit to the correct location if neccesary
            if lt(len, 32) { result := div(result, exp(256, sub(32, len))) }
        }

        return result;
    }

    // enforces 32 byte length
    function toUintStrict(RLPItem memory item) internal pure returns (uint256) {
        // one byte prefix
        require(item.len == 33);

        uint256 result;
        uint256 memPtr = item.memPtr + 1;
        assembly {
            result := mload(memPtr)
        }

        return result;
    }

    function toBytes(RLPItem memory item) internal pure returns (bytes memory) {
        require(item.len > 0);

        uint256 offset = _payloadOffset(item.memPtr);
        uint256 len = item.len - offset; // data length
        bytes memory result = new bytes(len);

        uint256 destPtr;
        assembly {
            destPtr := add(0x20, result)
        }

        copy(item.memPtr + offset, destPtr, len);
        return result;
    }

    function numItems(RLPItem memory item) private pure returns (uint256) {
        if (item.len == 0) return 0;

        uint256 count = 0;
        uint256 currPtr = item.memPtr + _payloadOffset(item.memPtr);
        uint256 endPtr = item.memPtr + item.len;
        while (currPtr < endPtr) {
            currPtr = currPtr + _itemLength(currPtr); // skip over an item
            ++count;
        }

        return count;
    }

    function _itemLength(uint256 memPtr) private pure returns (uint256) {
        uint256 itemLen;
        uint256 byte0;
        assembly {
            byte0 := byte(0, mload(memPtr))
        }

        if (byte0 < STRING_SHORT_START) {
            itemLen = 1;
        } else if (byte0 < STRING_LONG_START) {
            itemLen = byte0 - STRING_SHORT_START + 1;
        } else if (byte0 < LIST_SHORT_START) {
            uint256 dataLen;
            assembly {
                let byteLen := sub(byte0, 0xb7) // # of bytes the actual length is
                memPtr := add(memPtr, 1) // skip over the first byte

                /* 32 byte word size */
                dataLen := div(mload(memPtr), exp(256, sub(32, byteLen))) // right shifting to get the len
                itemLen := add(dataLen, add(byteLen, 1))
            }
            require(itemLen >= dataLen, "addition overflow");
        } else if (byte0 < LIST_LONG_START) {
            itemLen = byte0 - LIST_SHORT_START + 1;
        } else {
            uint256 dataLen;
            assembly {
                let byteLen := sub(byte0, 0xf7)
                memPtr := add(memPtr, 1)

                dataLen := div(mload(memPtr), exp(256, sub(32, byteLen))) // right shifting to the correct length
                itemLen := add(dataLen, add(byteLen, 1))
            }
            require(itemLen >= dataLen, "addition overflow");
        }

        return itemLen;
    }

    // @return number of bytes until the data
    function _payloadOffset(uint256 memPtr) private pure returns (uint256) {
        uint256 byte0;
        assembly {
            byte0 := byte(0, mload(memPtr))
        }

        if (byte0 < STRING_SHORT_START) {
            return 0;
        } else if (byte0 < STRING_LONG_START || (byte0 >= LIST_SHORT_START && byte0 < LIST_LONG_START)) {
            return 1;
        } else if (
            byte0 < LIST_SHORT_START // being explicit
        ) {
            return byte0 - (STRING_LONG_START - 1) + 1;
        } else {
            return byte0 - (LIST_LONG_START - 1) + 1;
        }
    }

    /*
    * @param src Pointer to source
    * @param dest Pointer to destination
    * @param len Amount of memory to copy from the source
    */
    function copy(uint256 src, uint256 dest, uint256 len) private pure {
        if (len == 0) return;

        // copy as many word sizes as possible
        for (; len >= WORD_SIZE; len -= WORD_SIZE) {
            assembly {
                mstore(dest, mload(src))
            }

            src += WORD_SIZE;
            dest += WORD_SIZE;
        }

        // left over bytes. Mask is used to remove unwanted bytes from the word
        uint256 mask = 256 ** (WORD_SIZE - len) - 1;
        assembly {
            let srcpart := and(mload(src), not(mask)) // zero out src
            let destpart := and(mload(dest), mask) // retrieve the bytes
            mstore(dest, or(destpart, srcpart))
        }
    }
}

// contracts/lib/RLPEncode.sol

library RLPEncode {
    uint8 constant STRING_OFFSET = 0x80;
    uint8 constant LIST_OFFSET = 0xc0;

    /**
     * @notice Encode string item
     * @param self The string (ie. byte array) item to encode
     * @return The RLP encoded string in bytes
     */
    function encodeBytes(bytes memory self) internal pure returns (bytes memory) {
        if (self.length == 1 && self[0] <= 0x7f) {
            return self;
        }
        return mergeBytes(encodeLength(self.length, STRING_OFFSET), self);
    }

    /**
     * @notice Encode address
     * @param self The address to encode
     * @return The RLP encoded address in bytes
     */
    function encodeAddress(address self) internal pure returns (bytes memory) {
        bytes memory b;
        assembly {
            let m := mload(0x40)
            mstore(add(m, 20), xor(0x140000000000000000000000000000000000000000, self))
            mstore(0x40, add(m, 52))
            b := m
        }
        return encodeBytes(b);
    }

    /**
     * @notice Encode uint
     * @param self The uint to encode
     * @return The RLP encoded uint in bytes
     */
    function encodeUint(uint256 self) internal pure returns (bytes memory) {
        return encodeBytes(toBinary(self));
    }

    /**
     * @notice Encode int
     * @param self The int to encode
     * @return The RLP encoded int in bytes
     */
    function encodeInt(int256 self) internal pure returns (bytes memory) {
        return encodeUint(uint256(self));
    }

    /**
     * @notice Encode bool
     * @param self The bool to encode
     * @return The RLP encoded bool in bytes
     */
    function encodeBool(bool self) internal pure returns (bytes memory) {
        bytes memory rs = new bytes(1);
        rs[0] = (self ? bytes1(0x01) : bytes1(0x80));
        return rs;
    }

    /**
     * @notice Encode list of items
     * @param self The list of items to encode, each item in list must be already encoded
     * @return The RLP encoded list of items in bytes
     */
    function encodeList(bytes[] memory self) internal pure returns (bytes memory) {
        if (self.length == 0) {
            return new bytes(0);
        }
        bytes memory payload = self[0];
        for (uint256 i = 1; i < self.length; ++i) {
            payload = mergeBytes(payload, self[i]);
        }
        return mergeBytes(encodeLength(payload.length, LIST_OFFSET), payload);
    }

    /**
     * @notice Concat two bytes arrays
     * @param _preBytes The first bytes array
     * @param _postBytes The second bytes array
     * @return The merged bytes array
     */
    function mergeBytes(bytes memory _preBytes, bytes memory _postBytes) internal pure returns (bytes memory) {
        bytes memory tempBytes;

        assembly {
            // Get a location of some free memory and store it in tempBytes as
            // Solidity does for memory variables.
            tempBytes := mload(0x40)

            // Store the length of the first bytes array at the beginning of
            // the memory for tempBytes.
            let length := mload(_preBytes)
            mstore(tempBytes, length)

            // Maintain a memory counter for the current write location in the
            // temp bytes array by adding the 32 bytes for the array length to
            // the starting location.
            let mc := add(tempBytes, 0x20)
            // Stop copying when the memory counter reaches the length of the
            // first bytes array.
            let end := add(mc, length)

            for {
                // Initialize a copy counter to the start of the _preBytes data,
                // 32 bytes into its memory.
                let cc := add(_preBytes, 0x20)
            } lt(mc, end) {
                // Increase both counters by 32 bytes each iteration.
                mc := add(mc, 0x20)
                cc := add(cc, 0x20)
            } {
                // Write the _preBytes data into the tempBytes memory 32 bytes
                // at a time.
                mstore(mc, mload(cc))
            }

            // Add the length of _postBytes to the current length of tempBytes
            // and store it as the new length in the first 32 bytes of the
            // tempBytes memory.
            length := mload(_postBytes)
            mstore(tempBytes, add(length, mload(tempBytes)))

            // Move the memory counter back from a multiple of 0x20 to the
            // actual end of the _preBytes data.
            mc := end
            // Stop copying when the memory counter reaches the new combined
            // length of the arrays.
            end := add(mc, length)

            for { let cc := add(_postBytes, 0x20) } lt(mc, end) {
                mc := add(mc, 0x20)
                cc := add(cc, 0x20)
            } { mstore(mc, mload(cc)) }

            // Update the free-memory pointer by padding our last write location
            // to 32 bytes: add 31 bytes to the end of tempBytes to move to the
            // next 32 byte block, then round down to the nearest multiple of
            // 32. If the sum of the length of the two arrays is zero then add
            // one before rounding down to leave a blank 32 bytes (the length block with 0).
            mstore(
                0x40,
                and(
                    add(add(end, iszero(add(length, mload(_preBytes)))), 31),
                    not(31) // Round down to the nearest 32 bytes.
                )
            )
        }

        return tempBytes;
    }

    /**
     * @notice Encode the first byte, followed by the `length` in binary form if `length` is more than 55.
     * @param length The length of the string or the payload
     * @param offset `STRING_OFFSET` if item is string, `LIST_OFFSET` if item is list
     * @return RLP encoded bytes
     */
    function encodeLength(uint256 length, uint256 offset) internal pure returns (bytes memory) {
        require(length < 256 ** 8, "input too long");
        bytes memory rs = new bytes(1);
        if (length <= 55) {
            rs[0] = bytes1(uint8(length + offset));
            return rs;
        }
        bytes memory bl = toBinary(length);
        rs[0] = bytes1(uint8(bl.length + offset + 55));
        return mergeBytes(rs, bl);
    }

    /**
     * @notice Encode integer in big endian binary form with no leading zeroes
     * @param x The integer to encode
     * @return RLP encoded bytes
     */
    function toBinary(uint256 x) internal pure returns (bytes memory) {
        bytes memory b = new bytes(32);
        assembly {
            mstore(add(b, 32), x)
        }
        uint256 i;
        if (x & 0xffffffffffffffffffffffffffffffffffffffffffffffff0000000000000000 == 0) {
            i = 24;
        } else if (x & 0xffffffffffffffffffffffffffffffff00000000000000000000000000000000 == 0) {
            i = 16;
        } else {
            i = 0;
        }
        for (; i < 32; ++i) {
            if (b[i] != 0) {
                break;
            }
        }
        uint256 length = 32 - i;
        bytes memory rs = new bytes(length);
        assembly {
            mstore(add(rs, length), x)
            mstore(rs, length)
        }
        return rs;
    }
}

// contracts/lib/SafeMath.sol

/**
 * Copyright (c) 2016-2019 zOS Global Limited
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;

        return c;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        // Solidity only automatically asserts when dividing by 0
        require(b > 0, errorMessage);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts with custom message when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

// contracts/lib/CmnPkg.sol

library CmnPkg {
    using RLPEncode for *;
    using RLPDecode for *;

    struct CommonAckPackage {
        uint32 code;
    }

    function encodeCommonAckPackage(uint32 code) internal pure returns (bytes memory) {
        bytes[] memory elements = new bytes[](1);
        elements[0] = uint256(code).encodeUint();
        return elements.encodeList();
    }

    function decodeCommonAckPackage(bytes memory msgBytes) internal pure returns (CommonAckPackage memory, bool) {
        CommonAckPackage memory ackPkg;
        RLPDecode.Iterator memory iter = msgBytes.toRLPItem().iterator();

        bool success = false;
        uint256 idx = 0;
        while (iter.hasNext()) {
            if (idx == 0) {
                ackPkg.code = uint32(iter.next().toUint());
                success = true;
            } else {
                break;
            }
            ++idx;
        }
        return (ackPkg, success);
    }
}

// contracts/System.sol

contract System {
    bool public alreadyInit;

    uint32 public constant CODE_OK = 0;
    uint32 public constant ERROR_FAIL_DECODE = 100;

    uint8 public constant BIND_CHANNELID = 0x01;
    uint8 public constant TRANSFER_IN_CHANNELID = 0x02;
    uint8 public constant TRANSFER_OUT_CHANNELID = 0x03;
    uint8 public constant STAKING_CHANNELID = 0x08;
    uint8 public constant GOV_CHANNELID = 0x09;
    uint8 public constant SLASH_CHANNELID = 0x0b;
    uint8 public constant CROSS_STAKE_CHANNELID = 0x10;
    uint8 public constant BC_FUSION_CHANNELID = 0x11; // new channel id for cross-chain redelegate from Beacon Chain to Smart Chain after Feynman upgrade
    uint16 public constant bscChainID = 0x0038;

    address public constant VALIDATOR_CONTRACT_ADDR = 0x0000000000000000000000000000000000001000;
    address public constant SLASH_CONTRACT_ADDR = 0x0000000000000000000000000000000000001001;
    address public constant SYSTEM_REWARD_ADDR = 0x0000000000000000000000000000000000001002;
    address public constant LIGHT_CLIENT_ADDR = 0x0000000000000000000000000000000000001003;
    address public constant TOKEN_HUB_ADDR = 0x0000000000000000000000000000000000001004;
    address public constant INCENTIVIZE_ADDR = 0x0000000000000000000000000000000000001005;
    address public constant RELAYERHUB_CONTRACT_ADDR = 0x0000000000000000000000000000000000001006;
    address public constant GOV_HUB_ADDR = 0x0000000000000000000000000000000000001007;
    address public constant TOKEN_MANAGER_ADDR = 0x0000000000000000000000000000000000001008;
    address public constant CROSS_CHAIN_CONTRACT_ADDR = 0x0000000000000000000000000000000000002000;
    address public constant STAKING_CONTRACT_ADDR = 0x0000000000000000000000000000000000002001;
    address public constant STAKE_HUB_ADDR = 0x0000000000000000000000000000000000002002;
    address public constant STAKE_CREDIT_ADDR = 0x0000000000000000000000000000000000002003;
    address public constant GOVERNOR_ADDR = 0x0000000000000000000000000000000000002004;
    address public constant GOV_TOKEN_ADDR = 0x0000000000000000000000000000000000002005;
    address public constant TIMELOCK_ADDR = 0x0000000000000000000000000000000000002006;
    address public constant TOKEN_RECOVER_PORTAL_ADDR = 0x0000000000000000000000000000000000003000;

    modifier onlyCoinbase() {
        require(msg.sender == block.coinbase, "the message sender must be the block producer");
        _;
    }

    modifier onlyZeroGasPrice() {
        require(tx.gasprice == 0, "gasprice is not zero");
        _;
    }

    modifier onlyNotInit() {
        require(!alreadyInit, "the contract already init");
        _;
    }

    modifier onlyInit() {
        require(alreadyInit, "the contract not init yet");
        _;
    }

    modifier onlySlash() {
        require(msg.sender == SLASH_CONTRACT_ADDR, "the message sender must be slash contract");
        _;
    }

    modifier onlyTokenHub() {
        require(msg.sender == TOKEN_HUB_ADDR, "the message sender must be token hub contract");
        _;
    }

    modifier onlyGov() {
        require(msg.sender == GOV_HUB_ADDR, "the message sender must be governance contract");
        _;
    }

    modifier onlyValidatorContract() {
        require(msg.sender == VALIDATOR_CONTRACT_ADDR, "the message sender must be validatorSet contract");
        _;
    }

    modifier onlyCrossChainContract() {
        require(msg.sender == CROSS_CHAIN_CONTRACT_ADDR, "the message sender must be cross chain contract");
        _;
    }

    modifier onlyRelayerIncentivize() {
        require(msg.sender == INCENTIVIZE_ADDR, "the message sender must be incentivize contract");
        _;
    }

    modifier onlyRelayer() {
        require(IRelayerHub(RELAYERHUB_CONTRACT_ADDR).isRelayer(msg.sender), "the msg sender is not a relayer");
        _;
    }

    modifier onlyTokenManager() {
        require(msg.sender == TOKEN_MANAGER_ADDR, "the msg sender must be tokenManager");
        _;
    }

    modifier onlyStakeHub() {
        require(msg.sender == STAKE_HUB_ADDR, "the msg sender must be stakeHub");
        _;
    }

    modifier onlyGovernorTimelock() {
        require(msg.sender == TIMELOCK_ADDR, "the msg sender must be governor timelock contract");
        _;
    }

    modifier onlyTokenRecoverPortal() {
        require(msg.sender == TOKEN_RECOVER_PORTAL_ADDR, "the msg sender must be token recover portal");
        _;
    }

    // Not reliable, do not use when need strong verify
    function isContract(address addr) internal view returns (bool) {
        uint256 size;
        assembly {
            size := extcodesize(addr)
        }
        return size > 0;
    }
}

// contracts/BSCValidatorSet.sol

interface ICrossChain {
    function registeredContractChannelMap(address, uint8) external view returns (bool);
}

contract BSCValidatorSet is IBSCValidatorSet, System, IParamSubscriber, IApplication {
    using SafeMath for uint256;

    using RLPDecode for *;

    // will not transfer value less than 0.1 BNB for validators
    uint256 public constant DUSTY_INCOMING = 1e17;

    uint8 public constant JAIL_MESSAGE_TYPE = 1;
    uint8 public constant VALIDATORS_UPDATE_MESSAGE_TYPE = 0;

    // the precision of cross chain value transfer.
    uint256 public constant PRECISION = 1e10;
    uint256 public constant EXPIRE_TIME_SECOND_GAP = 1000;
    uint256 public constant MAX_NUM_OF_VALIDATORS = 100;

    bytes public constant INIT_VALIDATORSET_BYTES = hex"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    uint32 public constant ERROR_UNKNOWN_PACKAGE_TYPE = 101;
    uint32 public constant ERROR_FAIL_CHECK_VALIDATORS = 102;
    uint32 public constant ERROR_LEN_OF_VAL_MISMATCH = 103;
    uint32 public constant ERROR_RELAYFEE_TOO_LARGE = 104;

    uint256 public constant INIT_NUM_OF_CABINETS = 21;
    uint256 public constant EPOCH = 200;

    /*----------------- state of the contract -----------------*/
    Validator[] public currentValidatorSet;
    uint256 public expireTimeSecondGap;
    uint256 public totalInComing;

    // key is the `consensusAddress` of `Validator`,
    // value is the index of the element in `currentValidatorSet`.
    mapping(address => uint256) public currentValidatorSetMap;
    uint256 public numOfJailed;

    uint256 public constant BLOCK_FEES_RATIO_SCALE = 10000;
    address public constant BURN_ADDRESS = 0x000000000000000000000000000000000000dEaD;
    uint256 public constant INIT_BURN_RATIO = 1000;
    uint256 public burnRatio;
    bool public burnRatioInitialized; // deprecated

    // BEP-127 Temporary Maintenance
    uint256 public constant INIT_MAX_NUM_OF_MAINTAINING = 3;
    uint256 public constant INIT_MAINTAIN_SLASH_SCALE = 2;

    uint256 public maxNumOfMaintaining;
    uint256 public numOfMaintaining;
    uint256 public maintainSlashScale;

    // Corresponds strictly to currentValidatorSet
    // validatorExtraSet[index] = the `ValidatorExtra` info of currentValidatorSet[index]
    ValidatorExtra[] public validatorExtraSet;
    // BEP-131 candidate validator
    uint256 public numOfCabinets;
    uint256 public maxNumOfCandidates;
    uint256 public maxNumOfWorkingCandidates;

    // BEP-126 Fast Finality
    uint256 public constant INIT_SYSTEM_REWARD_RATIO = 625; // 625/10000 is 1/16
    uint256 public constant MAX_SYSTEM_REWARD_BALANCE = 100 ether;

    uint256 public systemRewardRatio;
    uint256 public previousHeight;
    uint256 public previousBalanceOfSystemReward; // deprecated
    bytes[] public previousVoteAddrFullSet;
    bytes[] public currentVoteAddrFullSet;
    bool public isSystemRewardIncluded;

    // BEP-294 BC-fusion
    Validator[] private _tmpMigratedValidatorSet;
    bytes[] private _tmpMigratedVoteAddrs;

    struct Validator {
        address consensusAddress;
        address payable feeAddress;
        address BBCFeeAddress;
        uint64 votingPower;
        // only in state
        bool jailed;
        uint256 incoming;
    }

    struct ValidatorExtra {
        // BEP-127 Temporary Maintenance
        uint256 enterMaintenanceHeight; // the height from where the validator enters Maintenance
        bool isMaintaining;
        // BEP-126 Fast Finality
        bytes voteAddress;
        // reserve for future use
        uint256[19] slots;
    }

    /*----------------- cross chain package -----------------*/
    struct IbcValidatorSetPackage {
        uint8 packageType;
        Validator[] validatorSet;
        bytes[] voteAddrs;
    }

    /*----------------- modifiers -----------------*/
    modifier noEmptyDeposit() {
        require(msg.value > 0, "deposit value is zero");
        _;
    }

    modifier initValidatorExtraSet() {
        if (validatorExtraSet.length == 0) {
            ValidatorExtra memory validatorExtra;
            // init validatorExtraSet
            uint256 validatorsNum = currentValidatorSet.length;
            for (uint256 i; i < validatorsNum; ++i) {
                validatorExtraSet.push(validatorExtra);
            }
        }

        _;
    }

    modifier oncePerBlock() {
        require(block.number > previousHeight, "can not do this twice in one block");
        _;
        previousHeight = block.number;
    }

    /*----------------- events -----------------*/
    event validatorSetUpdated();
    event validatorJailed(address indexed validator);
    event validatorEmptyJailed(address indexed validator);
    event batchTransfer(uint256 amount);
    event batchTransferFailed(uint256 indexed amount, string reason);
    event batchTransferLowerFailed(uint256 indexed amount, bytes reason);
    event systemTransfer(uint256 amount);
    event directTransfer(address payable indexed validator, uint256 amount);
    event directTransferFail(address payable indexed validator, uint256 amount);
    event deprecatedDeposit(address indexed validator, uint256 amount);
    event validatorDeposit(address indexed validator, uint256 amount);
    event validatorMisdemeanor(address indexed validator, uint256 amount);
    event validatorFelony(address indexed validator, uint256 amount);
    event failReasonWithStr(string message);
    event unexpectedPackage(uint8 channelId, bytes msgBytes);
    event paramChange(string key, bytes value);
    event feeBurned(uint256 amount);
    event validatorEnterMaintenance(address indexed validator);
    event validatorExitMaintenance(address indexed validator);
    event finalityRewardDeposit(address indexed validator, uint256 amount);
    event deprecatedFinalityRewardDeposit(address indexed validator, uint256 amount);
    event tmpValidatorSetUpdated(uint256 validatorsNum);

    /*----------------- init -----------------*/
    function init() external onlyNotInit {
        (IbcValidatorSetPackage memory validatorSetPkg, bool valid) =
            decodeValidatorSetSynPackage(INIT_VALIDATORSET_BYTES);
        require(valid, "failed to parse init validatorSet");
        for (uint256 i; i < validatorSetPkg.validatorSet.length; ++i) {
            currentValidatorSet.push(validatorSetPkg.validatorSet[i]);
            currentValidatorSetMap[validatorSetPkg.validatorSet[i].consensusAddress] = i + 1;
        }
        expireTimeSecondGap = EXPIRE_TIME_SECOND_GAP;
        alreadyInit = true;
    }

    receive() external payable { }

    /*----------------- Cross Chain App Implement -----------------*/
    function handleSynPackage(
        uint8,
        bytes calldata msgBytes
    ) external override onlyInit onlyCrossChainContract initValidatorExtraSet returns (bytes memory responsePayload) {
        (IbcValidatorSetPackage memory validatorSetPackage, bool ok) = decodeValidatorSetSynPackage(msgBytes);
        if (!ok) {
            return CmnPkg.encodeCommonAckPackage(ERROR_FAIL_DECODE);
        }
        uint32 resCode;
        if (validatorSetPackage.packageType == VALIDATORS_UPDATE_MESSAGE_TYPE) {
            resCode = updateValidatorSet(validatorSetPackage.validatorSet, validatorSetPackage.voteAddrs);
        } else if (validatorSetPackage.packageType == JAIL_MESSAGE_TYPE) {
            if (validatorSetPackage.validatorSet.length != 1) {
                emit failReasonWithStr("length of jail validators must be one");
                resCode = ERROR_LEN_OF_VAL_MISMATCH;
            } else {
                address validator = validatorSetPackage.validatorSet[0].consensusAddress;
                uint256 index = currentValidatorSetMap[validator];
                if (index == 0 || currentValidatorSet[index - 1].jailed) {
                    emit validatorEmptyJailed(validator);
                } else {
                    // felony will failed if the validator is the only one in the validator set
                    bool success = _felony(validator, index - 1);
                    if (!success) {
                        emit validatorEmptyJailed(validator);
                    }
                }
                resCode = CODE_OK;
            }
        } else {
            resCode = ERROR_UNKNOWN_PACKAGE_TYPE;
        }
        if (resCode == CODE_OK) {
            return new bytes(0);
        } else {
            return CmnPkg.encodeCommonAckPackage(resCode);
        }
    }

    function handleAckPackage(uint8 channelId, bytes calldata msgBytes) external override onlyCrossChainContract {
        // should not happen
        emit unexpectedPackage(channelId, msgBytes);
    }

    function handleFailAckPackage(uint8 channelId, bytes calldata msgBytes) external override onlyCrossChainContract {
        // should not happen
        emit unexpectedPackage(channelId, msgBytes);
    }

    /*----------------- External Functions -----------------*/
    /**
     * @dev Update validator set method after fusion fork.
     */
    function updateValidatorSetV2(
        address[] memory _consensusAddrs,
        uint64[] memory _votingPowers,
        bytes[] memory _voteAddrs
    ) public onlyCoinbase onlyZeroGasPrice {
        uint256 _length = _consensusAddrs.length;
        Validator[] memory _validatorSet = new Validator[](_length);
        for (uint256 i; i < _length; ++i) {
            _validatorSet[i] = Validator({
                consensusAddress: _consensusAddrs[i],
                feeAddress: payable(address(0)),
                BBCFeeAddress: address(0),
                votingPower: _votingPowers[i],
                jailed: false,
                incoming: 0
            });
        }

        // if staking channel is not closed, store the migrated validator set and return
        if (
            ICrossChain(CROSS_CHAIN_CONTRACT_ADDR).registeredContractChannelMap(
                VALIDATOR_CONTRACT_ADDR, STAKING_CHANNELID
            )
        ) {
            uint256 newLength = _validatorSet.length;
            uint256 oldLength = _tmpMigratedValidatorSet.length;
            if (oldLength > newLength) {
                for (uint256 i = newLength; i < oldLength; ++i) {
                    _tmpMigratedValidatorSet.pop();
                    _tmpMigratedVoteAddrs.pop();
                }
            }

            for (uint256 i; i < newLength; ++i) {
                if (i >= oldLength) {
                    _tmpMigratedValidatorSet.push(_validatorSet[i]);
                    _tmpMigratedVoteAddrs.push(_voteAddrs[i]);
                } else {
                    _tmpMigratedValidatorSet[i] = _validatorSet[i];
                    _tmpMigratedVoteAddrs[i] = _voteAddrs[i];
                }
            }

            emit tmpValidatorSetUpdated(newLength);
            return;
        }

        // step 0: force all maintaining validators to exit `Temporary Maintenance`
        // - 1. validators exit maintenance
        // - 2. clear all maintainInfo
        // - 3. get unjailed validators from validatorSet
        (Validator[] memory validatorSetTemp, bytes[] memory voteAddrsTemp) =
            _forceMaintainingValidatorsExit(_validatorSet, _voteAddrs);

        // step 1: distribute incoming
        for (uint256 i; i < currentValidatorSet.length; ++i) {
            uint256 incoming = currentValidatorSet[i].incoming;
            if (incoming != 0) {
                currentValidatorSet[i].incoming = 0;
                IStakeHub(STAKE_HUB_ADDR).distributeReward{ value: incoming }(currentValidatorSet[i].consensusAddress);
            }
        }

        // step 2: do dusk transfer
        if (address(this).balance > 0) {
            emit systemTransfer(address(this).balance);
            address(uint160(SYSTEM_REWARD_ADDR)).transfer(address(this).balance);
        }

        // step 3: do update validator set state
        totalInComing = 0;
        numOfJailed = 0;
        if (validatorSetTemp.length != 0) {
            doUpdateState(validatorSetTemp, voteAddrsTemp);
        }

        // step 3: clean slash contract
        ISlashIndicator(SLASH_CONTRACT_ADDR).clean();
        emit validatorSetUpdated();
    }

    /**
     * @dev Collect all fee of transactions from the current block and deposit it to the contract
     *
     * @param valAddr The validator address who produced the current block
     */
    function deposit(address valAddr) external payable onlyCoinbase onlyInit noEmptyDeposit onlyZeroGasPrice {
        uint256 value = msg.value;
        uint256 index = currentValidatorSetMap[valAddr];

        if (isSystemRewardIncluded == false) {
            systemRewardRatio = INIT_SYSTEM_REWARD_RATIO;
            burnRatio = INIT_BURN_RATIO;
            isSystemRewardIncluded = true;
        }

        if (value > 0 && systemRewardRatio > 0) {
            uint256 toSystemReward = msg.value.mul(systemRewardRatio).div(BLOCK_FEES_RATIO_SCALE);
            if (toSystemReward > 0) {
                address(uint160(SYSTEM_REWARD_ADDR)).transfer(toSystemReward);
                emit systemTransfer(toSystemReward);

                value = value.sub(toSystemReward);
            }
        }

        if (value > 0 && burnRatio > 0) {
            uint256 toBurn = msg.value.mul(burnRatio).div(BLOCK_FEES_RATIO_SCALE);
            if (toBurn > 0) {
                address(uint160(BURN_ADDRESS)).transfer(toBurn);
                emit feeBurned(toBurn);

                value = value.sub(toBurn);
            }
        }

        if (index > 0) {
            Validator storage validator = currentValidatorSet[index - 1];
            if (validator.jailed) {
                emit deprecatedDeposit(valAddr, value);
            } else {
                totalInComing = totalInComing.add(value);
                validator.incoming = validator.incoming.add(value);
                emit validatorDeposit(valAddr, value);
            }
        } else {
            // get incoming from deprecated validator;
            emit deprecatedDeposit(valAddr, value);
        }
    }

    function distributeFinalityReward(
        address[] calldata valAddrs,
        uint256[] calldata weights
    ) external onlyCoinbase oncePerBlock onlyZeroGasPrice onlyInit {
        uint256 totalValue;
        uint256 balanceOfSystemReward = address(SYSTEM_REWARD_ADDR).balance;
        if (balanceOfSystemReward > MAX_SYSTEM_REWARD_BALANCE) {
            // when a slash happens, theres will no rewards in some epochs,
            // it's tolerated because slash happens rarely
            totalValue = balanceOfSystemReward.sub(MAX_SYSTEM_REWARD_BALANCE);
        } else {
            return;
        }

        totalValue = ISystemReward(SYSTEM_REWARD_ADDR).claimRewards(payable(address(this)), totalValue);
        if (totalValue == 0) {
            return;
        }

        uint256 totalWeight;
        for (uint256 i; i < weights.length; ++i) {
            totalWeight += weights[i];
        }
        if (totalWeight == 0) {
            return;
        }

        uint256 value;
        address valAddr;
        uint256 index;

        for (uint256 i; i < valAddrs.length; ++i) {
            value = (totalValue * weights[i]) / totalWeight;
            valAddr = valAddrs[i];
            index = currentValidatorSetMap[valAddr];
            if (index > 0) {
                Validator storage validator = currentValidatorSet[index - 1];
                if (validator.jailed) {
                    emit deprecatedFinalityRewardDeposit(valAddr, value);
                } else {
                    totalInComing = totalInComing.add(value);
                    validator.incoming = validator.incoming.add(value);
                    emit finalityRewardDeposit(valAddr, value);
                }
            } else {
                // get incoming from deprecated validator;
                emit deprecatedFinalityRewardDeposit(valAddr, value);
            }
        }
    }

    /*----------------- View Functions -----------------*/
    /**
     * @notice Return the vote address and consensus address of the validators in `currentValidatorSet` that are not jailed
     */
    function getLivingValidators() external view override returns (address[] memory, bytes[] memory) {
        uint256 n = currentValidatorSet.length;
        uint256 living;
        for (uint256 i; i < n; ++i) {
            if (!currentValidatorSet[i].jailed) {
                living++;
            }
        }
        address[] memory consensusAddrs = new address[](living);
        bytes[] memory voteAddrs = new bytes[](living);
        living = 0;
        if (validatorExtraSet.length == n) {
            for (uint256 i; i < n; ++i) {
                if (!currentValidatorSet[i].jailed) {
                    consensusAddrs[living] = currentValidatorSet[i].consensusAddress;
                    voteAddrs[living] = validatorExtraSet[i].voteAddress;
                    living++;
                }
            }
        } else {
            for (uint256 i; i < n; ++i) {
                if (!currentValidatorSet[i].jailed) {
                    consensusAddrs[living] = currentValidatorSet[i].consensusAddress;
                    living++;
                }
            }
        }
        return (consensusAddrs, voteAddrs);
    }

    /**
     * @notice Return the vote address and consensus address of mining validators
     *
     * Mining validators are block producers in the current epoch
     * including most of the cabinets and a few of the candidates
     */
    function getMiningValidators() external view override returns (address[] memory, bytes[] memory) {
        uint256 _maxNumOfWorkingCandidates = maxNumOfWorkingCandidates;
        uint256 _numOfCabinets = numOfCabinets > 0 ? numOfCabinets : INIT_NUM_OF_CABINETS;

        address[] memory validators = getValidators();
        bytes[] memory voteAddrs = getVoteAddresses(validators);
        if (validators.length <= _numOfCabinets) {
            return (validators, voteAddrs);
        }

        if ((validators.length - _numOfCabinets) < _maxNumOfWorkingCandidates) {
            _maxNumOfWorkingCandidates = validators.length - _numOfCabinets;
        }
        if (_maxNumOfWorkingCandidates > 0) {
            uint256 epochNumber = block.number / EPOCH;
            shuffle(
                validators,
                voteAddrs,
                epochNumber,
                _numOfCabinets - _maxNumOfWorkingCandidates,
                0,
                _maxNumOfWorkingCandidates,
                _numOfCabinets
            );
            shuffle(
                validators,
                voteAddrs,
                epochNumber,
                _numOfCabinets - _maxNumOfWorkingCandidates,
                _numOfCabinets - _maxNumOfWorkingCandidates,
                _maxNumOfWorkingCandidates,
                validators.length - _numOfCabinets + _maxNumOfWorkingCandidates
            );
        }
        address[] memory miningValidators = new address[](_numOfCabinets);
        bytes[] memory miningVoteAddrs = new bytes[](_numOfCabinets);
        for (uint256 i; i < _numOfCabinets; ++i) {
            miningValidators[i] = validators[i];
            miningVoteAddrs[i] = voteAddrs[i];
        }
        return (miningValidators, miningVoteAddrs);
    }

    /**
     * @notice Return the consensus address of the validators in `currentValidatorSet` that are not jailed and not maintaining
     */
    function getValidators() public view returns (address[] memory) {
        uint256 n = currentValidatorSet.length;
        uint256 valid = 0;
        for (uint256 i; i < n; ++i) {
            if (isWorkingValidator(i)) {
                ++valid;
            }
        }
        address[] memory consensusAddrs = new address[](valid);
        valid = 0;
        for (uint256 i; i < n; ++i) {
            if (isWorkingValidator(i)) {
                consensusAddrs[valid] = currentValidatorSet[i].consensusAddress;
                ++valid;
            }
        }
        return consensusAddrs;
    }

    /**
     * @notice Return the current incoming of the validator
     */
    function getIncoming(address validator) external view returns (uint256) {
        uint256 index = currentValidatorSetMap[validator];
        if (index <= 0) {
            return 0;
        }
        return currentValidatorSet[index - 1].incoming;
    }

    /**
     * @notice Return whether the validator is a working validator(not jailed or maintaining) by index
     *
     * @param index The index of the validator in `currentValidatorSet`(from 0 to `currentValidatorSet.length-1`)
     */
    function isWorkingValidator(uint256 index) public view returns (bool) {
        if (index >= currentValidatorSet.length) {
            return false;
        }

        // validatorExtraSet[index] should not be used before it has been init.
        if (index >= validatorExtraSet.length) {
            return !currentValidatorSet[index].jailed;
        }

        return !currentValidatorSet[index].jailed && !validatorExtraSet[index].isMaintaining;
    }

    /**
     * @notice Return whether the validator is a working validator(not jailed or maintaining) by consensus address
     * Will return false if the validator is not in `currentValidatorSet`
     */
    function isCurrentValidator(address validator) external view override returns (bool) {
        uint256 index = currentValidatorSetMap[validator];
        if (index <= 0) {
            return false;
        }

        // the actual index
        index = index - 1;
        return isWorkingValidator(index);
    }

    /**
     * @notice Return the index of the validator in `currentValidatorSet`(from 0 to `currentValidatorSet.length-1`)
     */
    function getCurrentValidatorIndex(address validator) public view returns (uint256) {
        uint256 index = currentValidatorSetMap[validator];
        require(index > 0, "only current validators");

        // the actual index
        return index - 1;
    }

    /**
     * @notice Return the number of mining validators.
     * The function name is misleading, it should be `getMiningValidatorCount`. But it's kept for compatibility.
     */
    function getWorkingValidatorCount() public view returns (uint256 workingValidatorCount) {
        workingValidatorCount = getValidators().length;
        uint256 _numOfCabinets = numOfCabinets > 0 ? numOfCabinets : INIT_NUM_OF_CABINETS;
        if (workingValidatorCount > _numOfCabinets) {
            workingValidatorCount = _numOfCabinets;
        }
        if (workingValidatorCount == 0) {
            workingValidatorCount = 1;
        }
    }

    /*----------------- For slash -----------------*/
    function misdemeanor(address validator) external override onlySlash initValidatorExtraSet {
        uint256 validatorIndex = _misdemeanor(validator);
        if (canEnterMaintenance(validatorIndex)) {
            _enterMaintenance(validator, validatorIndex);
        }
    }

    function felony(address validator) external override initValidatorExtraSet {
        require(msg.sender == SLASH_CONTRACT_ADDR || msg.sender == STAKE_HUB_ADDR, "only slash or stakeHub contract");

        uint256 index = currentValidatorSetMap[validator];
        if (index <= 0) {
            return;
        }
        // the actual index
        index = index - 1;

        bool isMaintaining = validatorExtraSet[index].isMaintaining;
        if (_felony(validator, index) && isMaintaining) {
            --numOfMaintaining;
        }
    }

    function removeTmpMigratedValidator(address validator) external onlyStakeHub {
        for (uint256 i; i < _tmpMigratedValidatorSet.length; ++i) {
            if (_tmpMigratedValidatorSet[i].consensusAddress == validator) {
                _tmpMigratedValidatorSet[i].jailed = true;
                break;
            }
        }
    }

    /*----------------- For Temporary Maintenance -----------------*/
    /**
     * @notice Return whether the validator at index could enter maintenance
     */
    function canEnterMaintenance(uint256 index) public view returns (bool) {
        if (index >= currentValidatorSet.length) {
            return false;
        }

        if (
            currentValidatorSet[index].consensusAddress == address(0) // - 0. check if empty validator
                || (maxNumOfMaintaining == 0 || maintainSlashScale == 0) // - 1. check if not start
                || numOfMaintaining >= maxNumOfMaintaining // - 2. check if reached upper limit
                || !isWorkingValidator(index) // - 3. check if not working(not jailed and not maintaining)
                || validatorExtraSet[index].enterMaintenanceHeight > 0 // - 5. check if has Maintained during current 24-hour period
                    // current validators are selected every 24 hours(from 00:00:00 UTC to 23:59:59 UTC)
                || getValidators().length <= 1 // - 6. check num of remaining working validators
        ) {
            return false;
        }

        return true;
    }

    /**
     * @dev Enter maintenance for current validators. refer to https://github.com/bnb-chain/BEPs/blob/master/BEP127.md
     */
    function enterMaintenance() external initValidatorExtraSet {
        // check maintain config
        if (maxNumOfMaintaining == 0) {
            maxNumOfMaintaining = INIT_MAX_NUM_OF_MAINTAINING;
        }
        if (maintainSlashScale == 0) {
            maintainSlashScale = INIT_MAINTAIN_SLASH_SCALE;
        }

        uint256 index = getCurrentValidatorIndex(msg.sender);
        require(canEnterMaintenance(index), "can not enter Temporary Maintenance");
        _enterMaintenance(msg.sender, index);
    }

    /**
     * @dev Exit maintenance for current validators. refer to https://github.com/bnb-chain/BEPs/blob/master/BEP127.md
     */
    function exitMaintenance() external {
        uint256 index = getCurrentValidatorIndex(msg.sender);

        // jailed validators are allowed to exit maintenance
        require(validatorExtraSet[index].isMaintaining, "not in maintenance");
        uint256 miningValidatorCount = getWorkingValidatorCount();
        _exitMaintenance(msg.sender, index, miningValidatorCount);
    }

    /*----------------- Param update -----------------*/
    function updateParam(string calldata key, bytes calldata value) external override onlyInit onlyGov {
        if (Memory.compareStrings(key, "expireTimeSecondGap")) {
            require(value.length == 32, "length of expireTimeSecondGap mismatch");
            uint256 newExpireTimeSecondGap = BytesToTypes.bytesToUint256(32, value);
            require(
                newExpireTimeSecondGap >= 100 && newExpireTimeSecondGap <= 1e5,
                "the expireTimeSecondGap is out of range"
            );
            expireTimeSecondGap = newExpireTimeSecondGap;
        } else if (Memory.compareStrings(key, "burnRatio")) {
            require(value.length == 32, "length of burnRatio mismatch");
            uint256 newBurnRatio = BytesToTypes.bytesToUint256(32, value);
            require(
                newBurnRatio.add(systemRewardRatio) <= BLOCK_FEES_RATIO_SCALE,
                "the burnRatio plus systemRewardRatio must be no greater than 10000"
            );
            burnRatio = newBurnRatio;
        } else if (Memory.compareStrings(key, "maxNumOfMaintaining")) {
            require(value.length == 32, "length of maxNumOfMaintaining mismatch");
            uint256 newMaxNumOfMaintaining = BytesToTypes.bytesToUint256(32, value);
            uint256 _numOfCabinets = numOfCabinets;
            if (_numOfCabinets == 0) {
                _numOfCabinets = INIT_NUM_OF_CABINETS;
            }
            require(newMaxNumOfMaintaining < _numOfCabinets, "the maxNumOfMaintaining must be less than numOfCabinets");
            maxNumOfMaintaining = newMaxNumOfMaintaining;
        } else if (Memory.compareStrings(key, "maintainSlashScale")) {
            require(value.length == 32, "length of maintainSlashScale mismatch");
            uint256 newMaintainSlashScale = BytesToTypes.bytesToUint256(32, value);
            require(
                newMaintainSlashScale > 0 && newMaintainSlashScale < 10,
                "the maintainSlashScale must be greater than 0 and less than 10"
            );
            maintainSlashScale = newMaintainSlashScale;
        } else if (Memory.compareStrings(key, "maxNumOfWorkingCandidates")) {
            require(value.length == 32, "length of maxNumOfWorkingCandidates mismatch");
            uint256 newMaxNumOfWorkingCandidates = BytesToTypes.bytesToUint256(32, value);
            require(
                newMaxNumOfWorkingCandidates <= maxNumOfCandidates,
                "the maxNumOfWorkingCandidates must be not greater than maxNumOfCandidates"
            );
            maxNumOfWorkingCandidates = newMaxNumOfWorkingCandidates;
        } else if (Memory.compareStrings(key, "maxNumOfCandidates")) {
            require(value.length == 32, "length of maxNumOfCandidates mismatch");
            uint256 newMaxNumOfCandidates = BytesToTypes.bytesToUint256(32, value);
            maxNumOfCandidates = newMaxNumOfCandidates;
            if (maxNumOfWorkingCandidates > maxNumOfCandidates) {
                maxNumOfWorkingCandidates = maxNumOfCandidates;
            }
        } else if (Memory.compareStrings(key, "numOfCabinets")) {
            require(value.length == 32, "length of numOfCabinets mismatch");
            uint256 newNumOfCabinets = BytesToTypes.bytesToUint256(32, value);
            require(newNumOfCabinets > 0, "the numOfCabinets must be greater than 0");
            require(
                newNumOfCabinets <= MAX_NUM_OF_VALIDATORS, "the numOfCabinets must be less than MAX_NUM_OF_VALIDATORS"
            );
            numOfCabinets = newNumOfCabinets;
        } else if (Memory.compareStrings(key, "systemRewardRatio")) {
            require(value.length == 32, "length of systemRewardRatio mismatch");
            uint256 newSystemRewardRatio = BytesToTypes.bytesToUint256(32, value);
            require(
                newSystemRewardRatio.add(burnRatio) <= BLOCK_FEES_RATIO_SCALE,
                "the systemRewardRatio plus burnRatio must be no greater than 10000"
            );
            systemRewardRatio = newSystemRewardRatio;
        } else {
            require(false, "unknown param");
        }
        emit paramChange(key, value);
    }

    /*----------------- Internal Functions -----------------*/
    function updateValidatorSet(Validator[] memory validatorSet, bytes[] memory voteAddrs) internal returns (uint32) {
        {
            // do verify.
            if (validatorSet.length > MAX_NUM_OF_VALIDATORS) {
                emit failReasonWithStr("the number of validators exceed the limit");
                return ERROR_FAIL_CHECK_VALIDATORS;
            }
            for (uint256 i; i < validatorSet.length; ++i) {
                for (uint256 j; j < i; ++j) {
                    if (validatorSet[i].consensusAddress == validatorSet[j].consensusAddress) {
                        emit failReasonWithStr("duplicate consensus address of validatorSet");
                        return ERROR_FAIL_CHECK_VALIDATORS;
                    }
                }
            }
        }

        // step 0: force all maintaining validators to exit `Temporary Maintenance`
        // - 1. validators exit maintenance
        // - 2. clear all maintainInfo
        // - 3. get unjailed validators from validatorSet
        Validator[] memory validatorSetTemp;
        bytes[] memory voteAddrsTemp;
        {
            // get migrated validators
            Validator[] memory bscValidatorSet = _tmpMigratedValidatorSet;
            bytes[] memory bscVoteAddrs = _tmpMigratedVoteAddrs;
            for (uint256 i; i < bscValidatorSet.length; ++i) {
                bscValidatorSet[i].votingPower = bscValidatorSet[i].votingPower * 3; // amplify the voting power for BSC validators
            }
            (Validator[] memory mergedValidators, bytes[] memory mergedVoteAddrs) =
                _mergeValidatorSet(validatorSet, voteAddrs, bscValidatorSet, bscVoteAddrs);

            (validatorSetTemp, voteAddrsTemp) = _forceMaintainingValidatorsExit(mergedValidators, mergedVoteAddrs);
        }

        {
            //step 1: do calculate distribution, do not make it as an internal function for saving gas.
            uint256 crossSize;
            uint256 directSize;
            uint256 validatorsNum = currentValidatorSet.length;
            uint8[] memory isMigrated = new uint8[](validatorsNum);
            for (uint256 i; i < validatorsNum; ++i) {
                if (
                    IStakeHub(STAKE_HUB_ADDR).consensusToOperator(currentValidatorSet[i].consensusAddress) != address(0)
                ) {
                    isMigrated[i] = 1;
                    if (currentValidatorSet[i].incoming != 0) {
                        ++directSize;
                    }
                } else if (currentValidatorSet[i].incoming >= DUSTY_INCOMING) {
                    ++crossSize;
                } else if (currentValidatorSet[i].incoming != 0) {
                    ++directSize;
                }
            }

            //cross transfer
            address[] memory crossAddrs = new address[](crossSize);
            uint256[] memory crossAmounts = new uint256[](crossSize);
            uint256[] memory crossIndexes = new uint256[](crossSize);
            address[] memory crossRefundAddrs = new address[](crossSize);
            uint256 crossTotal;
            // direct transfer
            address payable[] memory directAddrs = new address payable[](directSize);
            uint256[] memory directAmounts = new uint256[](directSize);
            crossSize = 0;
            directSize = 0;
            uint256 relayFee = ITokenHub(TOKEN_HUB_ADDR).getMiniRelayFee();
            if (relayFee > DUSTY_INCOMING) {
                emit failReasonWithStr("fee is larger than DUSTY_INCOMING");
                return ERROR_RELAYFEE_TOO_LARGE;
            }
            for (uint256 i; i < validatorsNum; ++i) {
                if (isMigrated[i] == 1) {
                    if (currentValidatorSet[i].incoming != 0) {
                        directAddrs[directSize] = payable(currentValidatorSet[i].consensusAddress);
                        directAmounts[directSize] = currentValidatorSet[i].incoming;
                        isMigrated[directSize] = 1; // directSize must be less than i. so we can use directSize as index
                        ++directSize;
                    }
                } else if (currentValidatorSet[i].incoming >= DUSTY_INCOMING) {
                    crossAddrs[crossSize] = currentValidatorSet[i].BBCFeeAddress;
                    uint256 value = currentValidatorSet[i].incoming - currentValidatorSet[i].incoming % PRECISION;
                    crossAmounts[crossSize] = value.sub(relayFee);
                    crossRefundAddrs[crossSize] = currentValidatorSet[i].feeAddress;
                    crossIndexes[crossSize] = i;
                    crossTotal = crossTotal.add(value);
                    ++crossSize;
                } else if (currentValidatorSet[i].incoming != 0) {
                    directAddrs[directSize] = currentValidatorSet[i].feeAddress;
                    directAmounts[directSize] = currentValidatorSet[i].incoming;
                    isMigrated[directSize] = 0;
                    ++directSize;
                }
            }

            //step 2: do cross chain transfer
            bool failCross = false;
            if (crossTotal > 0) {
                try ITokenHub(TOKEN_HUB_ADDR).batchTransferOutBNB{ value: crossTotal }(
                    crossAddrs, crossAmounts, crossRefundAddrs, uint64(block.timestamp + expireTimeSecondGap)
                ) returns (bool success) {
                    if (success) {
                        emit batchTransfer(crossTotal);
                    } else {
                        emit batchTransferFailed(crossTotal, "batch transfer return false");
                    }
                } catch Error(string memory reason) {
                    failCross = true;
                    emit batchTransferFailed(crossTotal, reason);
                } catch (bytes memory lowLevelData) {
                    failCross = true;
                    emit batchTransferLowerFailed(crossTotal, lowLevelData);
                }
            }

            if (failCross) {
                for (uint256 i; i < crossIndexes.length; ++i) {
                    uint256 idx = crossIndexes[i];
                    bool success = currentValidatorSet[idx].feeAddress.send(currentValidatorSet[idx].incoming);
                    if (success) {
                        emit directTransfer(currentValidatorSet[idx].feeAddress, currentValidatorSet[idx].incoming);
                    } else {
                        emit directTransferFail(currentValidatorSet[idx].feeAddress, currentValidatorSet[idx].incoming);
                    }
                }
            }

            // step 3: direct transfer
            if (directAddrs.length > 0) {
                for (uint256 i; i < directAddrs.length; ++i) {
                    if (isMigrated[i] == 1) {
                        IStakeHub(STAKE_HUB_ADDR).distributeReward{ value: directAmounts[i] }(directAddrs[i]);
                    } else {
                        bool success = directAddrs[i].send(directAmounts[i]);
                        if (success) {
                            emit directTransfer(directAddrs[i], directAmounts[i]);
                        } else {
                            emit directTransferFail(directAddrs[i], directAmounts[i]);
                        }
                    }
                }
            }
        }

        for (uint256 i; i < currentValidatorSet.length; ++i) {
            if (currentValidatorSet[i].incoming != 0) {
                currentValidatorSet[i].incoming = 0;
            }
        }

        // step 4: do dusk transfer
        if (address(this).balance > 0) {
            emit systemTransfer(address(this).balance);
            address(uint160(SYSTEM_REWARD_ADDR)).transfer(address(this).balance);
        }

        // step 5: do update validator set state
        totalInComing = 0;
        numOfJailed = 0;
        if (validatorSetTemp.length > 0) {
            doUpdateState(validatorSetTemp, voteAddrsTemp);
        }

        // step 6: clean slash contract
        ISlashIndicator(SLASH_CONTRACT_ADDR).clean();
        emit validatorSetUpdated();
        return CODE_OK;
    }

    function doUpdateState(Validator[] memory newValidatorSet, bytes[] memory newVoteAddrs) private {
        uint256 n = currentValidatorSet.length;
        uint256 m = newValidatorSet.length;

        // delete stale validators
        for (uint256 i; i < n; ++i) {
            bool stale = true;
            Validator memory oldValidator = currentValidatorSet[i];
            for (uint256 j; j < m; ++j) {
                if (oldValidator.consensusAddress == newValidatorSet[j].consensusAddress) {
                    stale = false;
                    break;
                }
            }
            if (stale) {
                delete currentValidatorSetMap[oldValidator.consensusAddress];
            }
        }

        // if old validator set is larger than new validator set, pop the extra validators
        if (n > m) {
            for (uint256 i = m; i < n; ++i) {
                currentValidatorSet.pop();
                validatorExtraSet.pop();
            }
        }

        uint256 k = n < m ? n : m;
        for (uint256 i; i < k; ++i) {
            // if the validator is not the same, update the validator set directly
            if (!isSameValidator(newValidatorSet[i], currentValidatorSet[i])) {
                currentValidatorSetMap[newValidatorSet[i].consensusAddress] = i + 1;
                currentValidatorSet[i] = newValidatorSet[i];
                validatorExtraSet[i].voteAddress = newVoteAddrs[i];
                validatorExtraSet[i].isMaintaining = false;
                validatorExtraSet[i].enterMaintenanceHeight = 0;
            } else {
                currentValidatorSet[i].votingPower = newValidatorSet[i].votingPower;
                // update the vote address if it is different
                if (!BytesLib.equal(newVoteAddrs[i], validatorExtraSet[i].voteAddress)) {
                    validatorExtraSet[i].voteAddress = newVoteAddrs[i];
                }
            }
        }

        if (m > n) {
            ValidatorExtra memory _validatorExtra;
            for (uint256 i = n; i < m; ++i) {
                _validatorExtra.voteAddress = newVoteAddrs[i];
                currentValidatorSet.push(newValidatorSet[i]);
                validatorExtraSet.push(_validatorExtra);
                currentValidatorSetMap[newValidatorSet[i].consensusAddress] = i + 1;
            }
        }

        // update vote addr full set
        setPreviousVoteAddrFullSet();
        setCurrentVoteAddrFullSet();

        // make sure all new validators are cleared maintainInfo
        // should not happen, still protect
        numOfMaintaining = 0;
        n = currentValidatorSet.length;
        for (uint256 i; i < n; ++i) {
            validatorExtraSet[i].isMaintaining = false;
            validatorExtraSet[i].enterMaintenanceHeight = 0;
        }
    }

    /**
     * @dev With each epoch, there will be a partial rotation between cabinets and candidates. Rotation is determined by this function
     */
    function shuffle(
        address[] memory validators,
        bytes[] memory voteAddrs,
        uint256 epochNumber,
        uint256 startIdx,
        uint256 offset,
        uint256 limit,
        uint256 modNumber
    ) internal pure {
        for (uint256 i; i < limit; ++i) {
            uint256 random = uint256(keccak256(abi.encodePacked(epochNumber, startIdx + i))) % modNumber;
            if ((startIdx + i) != (offset + random)) {
                address tmpAddr = validators[startIdx + i];
                bytes memory tmpBLS = voteAddrs[startIdx + i];
                validators[startIdx + i] = validators[offset + random];
                validators[offset + random] = tmpAddr;
                voteAddrs[startIdx + i] = voteAddrs[offset + random];
                voteAddrs[offset + random] = tmpBLS;
            }
        }
    }

    /**
     * @dev Check if two validators are the same
     *
     * Vote address is not considered
     */
    function isSameValidator(Validator memory v1, Validator memory v2) private pure returns (bool) {
        return v1.consensusAddress == v2.consensusAddress && v1.feeAddress == v2.feeAddress
            && v1.BBCFeeAddress == v2.BBCFeeAddress;
    }

    function getVoteAddresses(address[] memory validators) internal view returns (bytes[] memory) {
        uint256 n = currentValidatorSet.length;
        uint256 length = validators.length;
        bytes[] memory voteAddrs = new bytes[](length);

        // check if validatorExtraSet has been initialized
        if (validatorExtraSet.length != n) {
            return voteAddrs;
        }

        for (uint256 i; i < length; ++i) {
            voteAddrs[i] = validatorExtraSet[currentValidatorSetMap[validators[i]] - 1].voteAddress;
        }
        return voteAddrs;
    }

    function setPreviousVoteAddrFullSet() private {
        uint256 n = previousVoteAddrFullSet.length;
        uint256 m = currentVoteAddrFullSet.length;

        if (n > m) {
            for (uint256 i = m; i < n; ++i) {
                previousVoteAddrFullSet.pop();
            }
        }

        uint256 k = n < m ? n : m;
        for (uint256 i; i < k; ++i) {
            if (!BytesLib.equal(previousVoteAddrFullSet[i], currentVoteAddrFullSet[i])) {
                previousVoteAddrFullSet[i] = currentVoteAddrFullSet[i];
            }
        }

        if (m > n) {
            for (uint256 i = n; i < m; ++i) {
                previousVoteAddrFullSet.push(currentVoteAddrFullSet[i]);
            }
        }
    }

    function setCurrentVoteAddrFullSet() private {
        uint256 n = currentVoteAddrFullSet.length;
        uint256 m = validatorExtraSet.length;

        if (n > m) {
            for (uint256 i = m; i < n; ++i) {
                currentVoteAddrFullSet.pop();
            }
        }

        uint256 k = n < m ? n : m;
        for (uint256 i; i < k; ++i) {
            if (!BytesLib.equal(currentVoteAddrFullSet[i], validatorExtraSet[i].voteAddress)) {
                currentVoteAddrFullSet[i] = validatorExtraSet[i].voteAddress;
            }
        }

        if (m > n) {
            for (uint256 i = n; i < m; ++i) {
                currentVoteAddrFullSet.push(validatorExtraSet[i].voteAddress);
            }
        }
    }

    function isMonitoredForMaliciousVote(bytes calldata voteAddr) external view override returns (bool) {
        uint256 m = currentVoteAddrFullSet.length;
        for (uint256 i; i < m; ++i) {
            if (BytesLib.equal(voteAddr, currentVoteAddrFullSet[i])) {
                return true;
            }
        }

        uint256 n = previousVoteAddrFullSet.length;
        for (uint256 i; i < n; ++i) {
            if (BytesLib.equal(voteAddr, previousVoteAddrFullSet[i])) {
                return true;
            }
        }

        return false;
    }

    function _misdemeanor(address validator) private returns (uint256) {
        uint256 index = currentValidatorSetMap[validator];
        if (index <= 0) {
            return ~uint256(0);
        }
        // the actually index
        index = index - 1;

        uint256 income = currentValidatorSet[index].incoming;
        currentValidatorSet[index].incoming = 0;
        uint256 rest = currentValidatorSet.length - 1;
        emit validatorMisdemeanor(validator, income);
        if (rest == 0) {
            // should not happen, but still protect
            return index;
        }

        // averageDistribute*rest may less than income, but it is ok, the dust income will go to system reward eventually.
        uint256 averageDistribute = income / rest;
        if (averageDistribute != 0) {
            for (uint256 i; i < index; ++i) {
                currentValidatorSet[i].incoming = currentValidatorSet[i].incoming.add(averageDistribute);
            }
            uint256 n = currentValidatorSet.length;
            for (uint256 i = index + 1; i < n; ++i) {
                currentValidatorSet[i].incoming = currentValidatorSet[i].incoming.add(averageDistribute);
            }
        }

        return index;
    }

    function _felony(address validator, uint256 index) private returns (bool) {
        uint256 income = currentValidatorSet[index].incoming;
        uint256 rest = currentValidatorSet.length - 1;
        if (getValidators().length <= 1) {
            // will not remove the validator if it is the only one validator.
            currentValidatorSet[index].incoming = 0;
            return false;
        }
        emit validatorFelony(validator, income);

        // remove the validator from currentValidatorSet
        delete currentValidatorSetMap[validator];
        // remove felony validator
        for (uint256 i = index; i < (currentValidatorSet.length - 1); ++i) {
            currentValidatorSet[i] = currentValidatorSet[i + 1];
            validatorExtraSet[i] = validatorExtraSet[i + 1];
            currentValidatorSetMap[currentValidatorSet[i].consensusAddress] = i + 1;
        }
        currentValidatorSet.pop();
        validatorExtraSet.pop();

        // averageDistribute*rest may less than income, but it is ok, the dust income will go to system reward eventually.
        uint256 averageDistribute = income / rest;
        if (averageDistribute != 0) {
            uint256 n = currentValidatorSet.length;
            for (uint256 i; i < n; ++i) {
                currentValidatorSet[i].incoming = currentValidatorSet[i].incoming.add(averageDistribute);
            }
        }
        return true;
    }

    function _forceMaintainingValidatorsExit(
        Validator[] memory _validatorSet,
        bytes[] memory _voteAddrs
    ) private returns (Validator[] memory unjailedValidatorSet, bytes[] memory unjailedVoteAddrs) {
        uint256 numOfFelony = 0;
        address validator;
        bool isFelony;

        // 1. validators exit maintenance
        uint256 i;
        // caution: it must calculate miningValidatorCount before _exitMaintenance loop
        // because the miningValidatorCount will be changed in _exitMaintenance
        uint256 miningValidatorCount = getWorkingValidatorCount();
        // caution: it must loop from the endIndex to startIndex in currentValidatorSet
        // because the validators order in currentValidatorSet may be changed by _felony(validator)
        for (uint256 index = currentValidatorSet.length; index > 0; --index) {
            i = index - 1; // the actual index
            if (!validatorExtraSet[i].isMaintaining) {
                continue;
            }

            // only maintaining validators
            validator = currentValidatorSet[i].consensusAddress;

            // exit maintenance
            isFelony = _exitMaintenance(validator, i, miningValidatorCount);
            if (!isFelony) {
                continue;
            }

            // get the latest consensus address
            address latestConsensusAddress;
            address operatorAddress = IStakeHub(STAKE_HUB_ADDR).consensusToOperator(validator);
            if (operatorAddress != address(0)) {
                latestConsensusAddress = IStakeHub(STAKE_HUB_ADDR).getValidatorConsensusAddress(operatorAddress);
            }

            // record the jailed validator in validatorSet
            for (uint256 j; j < _validatorSet.length; ++j) {
                if (
                    _validatorSet[j].consensusAddress == validator
                        || _validatorSet[j].consensusAddress == latestConsensusAddress
                ) {
                    _validatorSet[j].jailed = true;
                    break;
                }
            }
        }

        // count the number of felony validators
        for (uint256 k; k < _validatorSet.length; ++k) {
            if (_validatorSet[k].jailed || _validatorSet[k].consensusAddress == address(0)) {
                ++numOfFelony;
            }
        }

        // 2. get unjailed validators from validatorSet
        if (numOfFelony >= _validatorSet.length) {
            // make sure there is at least one validator
            unjailedValidatorSet = new Validator[](1);
            unjailedVoteAddrs = new bytes[](1);
            unjailedValidatorSet[0] = _validatorSet[0];
            unjailedVoteAddrs[0] = _voteAddrs[0];
            unjailedValidatorSet[0].jailed = false;
        } else {
            unjailedValidatorSet = new Validator[](_validatorSet.length - numOfFelony);
            unjailedVoteAddrs = new bytes[](_validatorSet.length - numOfFelony);
            i = 0;
            for (uint256 index; index < _validatorSet.length; ++index) {
                if (!_validatorSet[index].jailed && _validatorSet[index].consensusAddress != address(0)) {
                    unjailedValidatorSet[i] = _validatorSet[index];
                    unjailedVoteAddrs[i] = _voteAddrs[index];
                    ++i;
                }
            }
        }

        return (unjailedValidatorSet, unjailedVoteAddrs);
    }

    function _enterMaintenance(address validator, uint256 index) private {
        ++numOfMaintaining;
        validatorExtraSet[index].isMaintaining = true;
        validatorExtraSet[index].enterMaintenanceHeight = block.number;
        emit validatorEnterMaintenance(validator);
    }

    function _exitMaintenance(
        address validator,
        uint256 index,
        uint256 miningValidatorCount
    ) private returns (bool isFelony) {
        if (maintainSlashScale == 0 || miningValidatorCount == 0 || numOfMaintaining == 0) {
            // should not happen, still protect
            return false;
        }

        // step 1: calculate slashCount
        uint256 slashCount = block.number.sub(validatorExtraSet[index].enterMaintenanceHeight).div(miningValidatorCount)
            .div(maintainSlashScale);

        // step2: slash the validator
        (uint256 misdemeanorThreshold, uint256 felonyThreshold) =
            ISlashIndicator(SLASH_CONTRACT_ADDR).getSlashThresholds();
        isFelony = false;
        if (slashCount >= felonyThreshold) {
            _felony(validator, index);
            if (IStakeHub(STAKE_HUB_ADDR).consensusToOperator(validator) != address(0)) {
                ISlashIndicator(SLASH_CONTRACT_ADDR).downtimeSlash(validator, slashCount);
            } else {
                ISlashIndicator(SLASH_CONTRACT_ADDR).sendFelonyPackage(validator);
            }
            isFelony = true;
        } else if (slashCount >= misdemeanorThreshold) {
            _misdemeanor(validator);
        }

        // step 3: modify global storage
        --numOfMaintaining;
        validatorExtraSet[index].isMaintaining = false;

        emit validatorExitMaintenance(validator);
    }

    function _mergeValidatorSet(
        Validator[] memory validatorSet1,
        bytes[] memory voteAddrSet1,
        Validator[] memory validatorSet2,
        bytes[] memory voteAddrSet2
    ) internal view returns (Validator[] memory, bytes[] memory) {
        uint256 _length = IStakeHub(STAKE_HUB_ADDR).maxElectedValidators();
        if (validatorSet1.length + validatorSet2.length < _length) {
            _length = validatorSet1.length + validatorSet2.length;
        }
        Validator[] memory mergedValidatorSet = new Validator[](_length);
        bytes[] memory mergedVoteAddrSet = new bytes[](_length);

        uint256 i;
        uint256 j;
        uint256 k;
        while ((i < validatorSet1.length || j < validatorSet2.length) && k < _length) {
            if (i == validatorSet1.length) {
                mergedValidatorSet[k] = validatorSet2[j];
                mergedVoteAddrSet[k] = voteAddrSet2[j];
                ++j;
                ++k;
                continue;
            }

            if (j == validatorSet2.length) {
                mergedValidatorSet[k] = validatorSet1[i];
                mergedVoteAddrSet[k] = voteAddrSet1[i];
                ++i;
                ++k;
                continue;
            }

            if (validatorSet1[i].votingPower > validatorSet2[j].votingPower) {
                mergedValidatorSet[k] = validatorSet1[i];
                mergedVoteAddrSet[k] = voteAddrSet1[i];
                ++i;
            } else if (validatorSet1[i].votingPower < validatorSet2[j].votingPower) {
                mergedValidatorSet[k] = validatorSet2[j];
                mergedVoteAddrSet[k] = voteAddrSet2[j];
                ++j;
            } else {
                if (validatorSet1[i].consensusAddress < validatorSet2[j].consensusAddress) {
                    mergedValidatorSet[k] = validatorSet1[i];
                    mergedVoteAddrSet[k] = voteAddrSet1[i];
                    ++i;
                } else {
                    mergedValidatorSet[k] = validatorSet2[j];
                    mergedVoteAddrSet[k] = voteAddrSet2[j];
                    ++j;
                }
            }
            ++k;
        }

        return (mergedValidatorSet, mergedVoteAddrSet);
    }

    //rlp encode & decode function
    function decodeValidatorSetSynPackage(bytes memory msgBytes)
        internal
        pure
        returns (IbcValidatorSetPackage memory, bool)
    {
        IbcValidatorSetPackage memory validatorSetPkg;

        RLPDecode.Iterator memory iter = msgBytes.toRLPItem().iterator();
        bool success = false;
        uint256 idx = 0;
        while (iter.hasNext()) {
            if (idx == 0) {
                validatorSetPkg.packageType = uint8(iter.next().toUint());
            } else if (idx == 1) {
                RLPDecode.RLPItem[] memory items = iter.next().toList();
                validatorSetPkg.validatorSet = new Validator[](items.length);
                validatorSetPkg.voteAddrs = new bytes[](items.length);
                for (uint256 j; j < items.length; ++j) {
                    (Validator memory val, bytes memory voteAddr, bool ok) = decodeValidator(items[j]);
                    if (!ok) {
                        return (validatorSetPkg, false);
                    }
                    validatorSetPkg.validatorSet[j] = val;
                    validatorSetPkg.voteAddrs[j] = voteAddr;
                }
                success = true;
            } else {
                break;
            }
            ++idx;
        }
        return (validatorSetPkg, success);
    }

    function decodeValidator(RLPDecode.RLPItem memory itemValidator)
        internal
        pure
        returns (Validator memory, bytes memory, bool)
    {
        Validator memory validator;
        bytes memory voteAddr;
        RLPDecode.Iterator memory iter = itemValidator.iterator();
        bool success = false;
        uint256 idx = 0;
        while (iter.hasNext()) {
            if (idx == 0) {
                validator.consensusAddress = iter.next().toAddress();
            } else if (idx == 1) {
                validator.feeAddress = address(uint160(iter.next().toAddress()));
            } else if (idx == 2) {
                validator.BBCFeeAddress = iter.next().toAddress();
            } else if (idx == 3) {
                validator.votingPower = uint64(iter.next().toUint());
                success = true;
            } else if (idx == 4) {
                voteAddr = iter.next().toBytes();
            } else {
                break;
            }
            ++idx;
        }
        return (validator, voteAddr, success);
    }
}

Contract Security Audit

Contract ABI

[{"anonymous": false,"inputs": [{"indexed": false,"internalType": "uint256","name": "amount","type": "uint256"}],"name": "batchTransfer","type": "event"},{"anonymous": false,"inputs": [{"indexed": true,"internalType": "uint256","name": "amount","type": "uint256"},{"indexed": false,"internalType": "string","name": "reason","type": "string"}],"name": "batchTransferFailed","type": "event"},{"anonymous": false,"inputs": [{"indexed": true,"internalType": "uint256","name": "amount","type": "uint256"},{"indexed": false,"internalType": "bytes","name": "reason","type": "bytes"}],"name": "batchTransferLowerFailed","type": "event"},{"anonymous": false,"inputs": [{"indexed": true,"internalType": "address","name": "validator","type": "address"},{"indexed": false,"internalType": "uint256","name": "amount","type": "uint256"}],"name": "deprecatedDeposit","type": "event"},{"anonymous": false,"inputs": [{"indexed": true,"internalType": "address","name": "validator","type": "address"},{"indexed": false,"internalType": "uint256","name": "amount","type": "uint256"}],"name": "deprecatedFinalityRewardDeposit","type": "event"},{"anonymous": false,"inputs": [{"indexed": true,"internalType": "address payable","name": "validator","type": "address"},{"indexed": false,"internalType": "uint256","name": "amount","type": "uint256"}],"name": "directTransfer","type": "event"},{"anonymous": false,"inputs": [{"indexed": true,"internalType": "address payable","name": "validator","type": "address"},{"indexed": false,"internalType": "uint256","name": "amount","type": "uint256"}],"name": "directTransferFail","type": "event"},{"anonymous": false,"inputs": [{"indexed": false,"internalType": "string","name": "message","type": "string"}],"name": "failReasonWithStr","type": "event"},{"anonymous": false,"inputs": [{"indexed": false,"internalType": "uint256","name": "amount","type": "uint256"}],"name": "feeBurned","type": "event"},{"anonymous": false,"inputs": [{"indexed": true,"internalType": "address","name": "validator","type": "address"},{"indexed": false,"internalType": "uint256","name": "amount","type": "uint256"}],"name": "finalityRewardDeposit","type": "event"},{"anonymous": false,"inputs": [{"indexed": false,"internalType": "string","name": "key","type": "string"},{"indexed": false,"internalType": "bytes","name": "value","type": "bytes"}],"name": "paramChange","type": "event"},{"anonymous": false,"inputs": [{"indexed": false,"internalType": "uint256","name": "amount","type": "uint256"}],"name": "systemTransfer","type": "event"},{"anonymous": false,"inputs": [{"indexed": false,"internalType": "uint256","name": "validatorsNum","type": "uint256"}],"name": "tmpValidatorSetUpdated","type": "event"},{"anonymous": false,"inputs": [{"indexed": false,"internalType": "uint8","name": "channelId","type": "uint8"},{"indexed": false,"internalType": "bytes","name": "msgBytes","type": "bytes"}],"name": "unexpectedPackage","type": "event"},{"anonymous": false,"inputs": [{"indexed": true,"internalType": "address","name": "validator","type": "address"},{"indexed": false,"internalType": "uint256","name": "amount","type": "uint256"}],"name": "validatorDeposit","type": "event"},{"anonymous": false,"inputs": [{"indexed": true,"internalType": "address","name": "validator","type": "address"}],"name": "validatorEmptyJailed","type": "event"},{"anonymous": false,"inputs": [{"indexed": true,"internalType": "address","name": "validator","type": "address"}],"name": "validatorEnterMaintenance","type": "event"},{"anonymous": false,"inputs": [{"indexed": true,"internalType": "address","name": "validator","type": "address"}],"name": "validatorExitMaintenance","type": "event"},{"anonymous": false,"inputs": [{"indexed": true,"internalType": "address","name": "validator","type": "address"},{"indexed": false,"internalType": "uint256","name": "amount","type": "uint256"}],"name": "validatorFelony","type": "event"},{"anonymous": false,"inputs": [{"indexed": true,"internalType": "address","name": "validator","type": "address"}],"name": "validatorJailed","type": "event"},{"anonymous": false,"inputs": [{"indexed": true,"internalType": "address","name": "validator","type": "address"},{"indexed": false,"internalType": "uint256","name": "amount","type": "uint256"}],"name": "validatorMisdemeanor","type": "event"},{"anonymous": false,"inputs": [],"name": "validatorSetUpdated","type": "event"},{"inputs": [],"name": "BC_FUSION_CHANNELID","outputs": [{"internalType": "uint8","name": "","type": "uint8"}],"stateMutability": "view","type": "function"},{"inputs": [],"name": "BIND_CHANNELID","outputs": [{"internalType": "uint8","name": "","type": "uint8"}],"stateMutability": "view","type": "function"},{"inputs": [],"name": "BLOCK_FEES_RATIO_SCALE","outputs": [{"internalType": "uint256","name": "","type": "uint256"}],"stateMutability": "view","type": "function"},{"inputs": [],"name": "BURN_ADDRESS","outputs": [{"internalType": "address","name": "","type": "address"}],"stateMutability": "view","type": "function"},{"inputs": [],"name": "CODE_OK","outputs": [{"internalType": "uint32","name": "","type": "uint32"}],"stateMutability": "view","type": "function"},{"inputs": [],"name": "CROSS_CHAIN_CONTRACT_ADDR","outputs": [{"internalType": "address","name": "","type": "address"}],"stateMutability": "view","type": "function"},{"inputs": [],"name": "CROSS_STAKE_CHANNELID","outputs": [{"internalType": "uint8","name": "","type": "uint8"}],"stateMutability": "view","type": "function"},{"inputs": [],"name": "DUSTY_INCOMING","outputs": [{"internalType": "uint256","name": "","type": "uint256"}],"stateMutability": "view","type": "function"},{"inputs": [],"name": "EPOCH","outputs": [{"internalType": "uint256","name": "","type": "uint256"}],"stateMutability": "view","type": "function"},{"inputs": [],"name": "ERROR_FAIL_CHECK_VALIDATORS","outputs": [{"internalType": "uint32","name": "","type": "uint32"}],"stateMutability": "view","type": "function"},{"inputs": [],"name": "ERROR_FAIL_DECODE","outputs": [{"internalType": "uint32","name": "","type": "uint32"}],"stateMutability": "view","type": "function"},{"inputs": [],"name": "ERROR_LEN_OF_VAL_MISMATCH","outputs": [{"internalType": "uint32","name": "","type": "uint32"}],"stateMutability": "view","type": "function"},{"inputs": [],"name": "ERROR_RELAYFEE_TOO_LARGE","outputs": [{"internalType": "uint32","name": "","type": "uint32"}],"stateMutability": "view","type": "function"},{"inputs": [],"name": "ERROR_UNKNOWN_PACKAGE_TYPE","outputs": [{"internalType": "uint32","name": "","type": "uint32"}],"stateMutability": "view","type": "function"},{"inputs": [],"name": "EXPIRE_TIME_SECOND_GAP","outputs": [{"internalType": "uint256","name": "","type": "uint256"}],"stateMutability": "view","type": "function"},{"inputs": [],"name": "GOVERNOR_ADDR","outputs": [{"internalType": "address","name": "","type": "address"}],"stateMutability": "view","type": "function"},{"inputs": [],"name": 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Contract Creation Code

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Multichain Portfolio | 30 Chains

Display all chains •
Last updated: less than 1 sec ago
BNB Chain
BNB Chain (30)
$189,546 (99%)
Ethereum
Ethereum (2)
$956 (1%)
Optimism
Optimism (1)
$3 (<1%)
Base
Base (1)
$2 (<1%)
opBNB
opBNB (1)
0 (<1%)
Arbitrum One
Arbitrum One (1)
0 (<1%)
Linea
Linea (1)
0 (<1%)
Polygon
Polygon (0)
0 (0%)
BTTC
BTTC (0)
0 (0%)
Celo
Celo (0)
0 (0%)
Fantom
Fantom (0)
0 (0%)
Gnosis
Gnosis (0)
0 (0%)
Polygon zkEVM
Polygon zkEVM (0)
0 (0%)
Moonbeam
Moonbeam (0)
0 (0%)
Moonriver
Moonriver (0)
0 (0%)
Arbitrum Nova
Arbitrum Nova (0)
0 (0%)
Scroll
Scroll (0)
0 (0%)
Wemix
Wemix (0)
0 (0%)
Avax C-Chain
Avax C-Chain (0)
0 (0%)
zkSync Era
zkSync Era (0)
0 (0%)
Fraxtal
Fraxtal (0)
0 (0%)
Blast
Blast (0)
0 (0%)
Cronos
Cronos (0)
0 (0%)
Mantle
Mantle (0)
0 (0%)
Taiko
Taiko (0)
0 (0%)
Xai
Xai (0)
0 (0%)
World
World (0)
0 (0%)
Xdc
Xdc (0)
0 (0%)
Ape
Ape (0)
0 (0%)
Sophon
Sophon (0)
0 (0%)
Chain Token Portfolio % Price Amount Value
BSC
BNB Chain (BNB)
94.77%$696.36259.2728$180,548.24
BSC
BabyApe (BABYAPE)
1.90%$0.000007543,696,662.5298$3,617.11
BSC
SpongeBob Square (SPONGS)
1.47%$0.0003168,836,000$2,791.36
BSC
Binance-Peg BSC-USD (BSC-USD)
0.59%$0.9979561,118.2861$1,116
BSC
TheBullockchain (XBUL)
0.48%<$0.0000013,000,002,004.6432$917.7
BSC
MetaWar (METAWAR)
0.13%$0.02563310,000$256.33
BSC
Trust Wallet (TWT)
0.06%$1.1699.5$115.58
BSC
Binance-Peg Cardano Token (ADA)
0.05%$0.86932113.0589$98.28
BSC
Musk Token (MUSK)
0.01%<$0.000001200,000,000$26.68
BSC
Nicheman (NICHEMAN)
<0.01%<$0.0000014,772,629,056.1795$11.93
BSC
MechMaster (MECH)
<0.01%$0.0007512,700$9.53
BSC
Hare Token (HARE)
<0.01%<$0.000001296,137,155,953,485,630$9.48
BSC
GoMining Token (GMT)
<0.01%$0.50010410$5
BSC
Sologenic (SOLO)
<0.01%$0.38344611.2975$4.33
BSC
Poollotto.finance (PLT)
<0.01%$3.631$3.63
BSC
WenLambo (WLBO)
<0.01%$0.0019821,800.003$3.57
BSC
Sacred Tails (ST)
<0.01%$0.00031110,154.4234$3.16
BSC
Binance-Peg BUSD Token (BUSD)
<0.01%$11.927$1.93
BSC
Saiyan Inu (SAYAN)
<0.01%<$0.00000112,154,909,481.4719$1.22
BSC
Binance-Peg XRP Token (XRP)
<0.01%$2.070.441$0.9137
BSC
Mobox (MBOX)
<0.01%$0.1903824$0.7615
BSC
Fantom (FTM)
<0.01%$0.7881090.8$0.6304
BSC
Binance-Peg Filecoin (FIL)
<0.01%$50.107$0.5344
BSC
Binance-Peg Kyber Network Crystal Token (KNC)
<0.01%$0.5565060.833$0.4635
BSC
Binance-Peg ELF Token (ELF)
<0.01%$0.447980.615$0.2755
BSC
Petoverse (PETO)
<0.01%$0.1384271.8356$0.254
BSC
XBank (XBA)
<0.01%$0.2455871$0.2455
BSC
Baby Shiba Inu (BABYSHIBAINU)
<0.01%<$0.00000137,132,404.5886$0.2408
BSC
LEOPARD (LEOPARD)
<0.01%<$0.000001355,028,038,988.7721$0.2239
BSC
Dalarnia (DAR)
<0.01%$0.1515230.75$0.1136
ETH
Tether USD (USDT)
0.50%$0.997956950$948.06
ETH
Ether (ETH)
<0.01%$3,407.220.00236071$8.04
OP
Ether (ETH)
<0.01%$3,407.690.001$3.41
BASE
Ether (ETH)
<0.01%$3,407.720.00071627$2.44
OPBNB
BNB Chain (BNB)
<0.01%$696.390.000002$0.001393
ARB
Ether (ETH)
<0.01%$3,407.730.0000003$0.001022
LINEA
Ether (ETH)
<0.01%$3,408.350.0000002$0.000682
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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.