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0x1Bb21b6EDB83E3dB63bde9F51616dA6909A368D2

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0x306271c9...5a31295C8 at txn 0x5d1ac72f8fafdeed4faa3833c2dcaa7d0072ece7900a1968e91bfb1c2fe8c096

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	Transaction Hash	Method	Block		From		To
	0x5d1ac72f8fafdeed4faa3833c2dcaa7d0072ece7900a1968e91bfb1c2fe8c096	0x60806040	7024698	2019-01-07 8:28:21	2150 days ago	1546849701	0x306271c9...5a31295C8	IN	Create: ForeignBridge	0 ETH$0.00	0.01098129	4

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Contract Source Code Verified (Exact Match)

Contract Name:

ForeignBridge

Compiler Version

v0.4.24+commit.e67f0147

Optimization Enabled:

Yes with 200 runs

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default evmVersion

Contract Source Code (Solidity)

IDE

/**
 *Submitted for verification at Etherscan.io on 2019-01-07
*/

pragma solidity 0.4.24;

// File: contracts/ERC677Receiver.sol

contract ERC677Receiver {
    function onTokenTransfer(address _from, uint _value, bytes _data) external returns(bool);
}

// File: openzeppelin-solidity/contracts/token/ERC20/ERC20Basic.sol

/**
 * @title ERC20Basic
 * @dev Simpler version of ERC20 interface
 * @dev see https://github.com/ethereum/EIPs/issues/179
 */
contract ERC20Basic {
    function totalSupply() public view returns (uint256);
    function balanceOf(address who) public view returns (uint256);
    function transfer(address to, uint256 value) public returns (bool);
    event Transfer(address indexed from, address indexed to, uint256 value);
}

// File: openzeppelin-solidity/contracts/token/ERC20/ERC20.sol

/**
 * @title ERC20 interface
 * @dev see https://github.com/ethereum/EIPs/issues/20
 */
contract ERC20 is ERC20Basic {
    function allowance(address owner, address spender) public view returns (uint256);
    function transferFrom(address from, address to, uint256 value) public returns (bool);
    function approve(address spender, uint256 value) public returns (bool);
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

// File: contracts/ERC677.sol

contract ERC677 is ERC20 {
    event Transfer(address indexed from, address indexed to, uint value, bytes data);

    function transferAndCall(address, uint, bytes) external returns (bool);

}

// File: contracts/IBurnableMintableERC677Token.sol

contract IBurnableMintableERC677Token is ERC677 {
    function mint(address, uint256) public returns (bool);
    function burn(uint256 _value) public;
    function claimTokens(address _token, address _to) public;
}

// File: contracts/IBridgeValidators.sol

interface IBridgeValidators {
    function isValidator(address _validator) public view returns(bool);
    function requiredSignatures() public view returns(uint256);
    function owner() public view returns(address);
}

// File: contracts/libraries/Message.sol

library Message {
    // function uintToString(uint256 inputValue) internal pure returns (string) {
    //     // figure out the length of the resulting string
    //     uint256 length = 0;
    //     uint256 currentValue = inputValue;
    //     do {
    //         length++;
    //         currentValue /= 10;
    //     } while (currentValue != 0);
    //     // allocate enough memory
    //     bytes memory result = new bytes(length);
    //     // construct the string backwards
    //     uint256 i = length - 1;
    //     currentValue = inputValue;
    //     do {
    //         result[i--] = byte(48 + currentValue % 10);
    //         currentValue /= 10;
    //     } while (currentValue != 0);
    //     return string(result);
    // }

    function addressArrayContains(address[] array, address value) internal pure returns (bool) {
        for (uint256 i = 0; i < array.length; i++) {
            if (array[i] == value) {
                return true;
            }
        }
        return false;
    }
    // layout of message :: bytes:
    // offset  0: 32 bytes :: uint256 - message length
    // offset 32: 20 bytes :: address - recipient address
    // offset 52: 32 bytes :: uint256 - value
    // offset 84: 32 bytes :: bytes32 - transaction hash
    // offset 116: 32 bytes :: uint256 - home gas price

    // bytes 1 to 32 are 0 because message length is stored as little endian.
    // mload always reads 32 bytes.
    // so we can and have to start reading recipient at offset 20 instead of 32.
    // if we were to read at 32 the address would contain part of value and be corrupted.
    // when reading from offset 20 mload will read 12 zero bytes followed
    // by the 20 recipient address bytes and correctly convert it into an address.
    // this saves some storage/gas over the alternative solution
    // which is padding address to 32 bytes and reading recipient at offset 32.
    // for more details see discussion in:
    // https://github.com/paritytech/parity-bridge/issues/61
    function parseMessage(bytes message)
    internal
    pure
    returns(address recipient, uint256 amount, bytes32 txHash)
    {
        require(isMessageValid(message));
        assembly {
            recipient := and(mload(add(message, 20)), 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF)
            amount := mload(add(message, 52))
            txHash := mload(add(message, 84))
        }
    }

    function isMessageValid(bytes _msg) internal pure returns(bool) {
        return _msg.length == 116;
    }

    function recoverAddressFromSignedMessage(bytes signature, bytes message) internal pure returns (address) {
        require(signature.length == 65);
        bytes32 r;
        bytes32 s;
        bytes1 v;
        // solium-disable-next-line security/no-inline-assembly
        assembly {
            r := mload(add(signature, 0x20))
            s := mload(add(signature, 0x40))
            v := mload(add(signature, 0x60))
        }
        return ecrecover(hashMessage(message), uint8(v), r, s);
    }

    function hashMessage(bytes message) internal pure returns (bytes32) {
        bytes memory prefix = "\x19Ethereum Signed Message:\n";
        // message is always 116 length
        string memory msgLength = "116";
        return keccak256(prefix, msgLength, message);
    }

    function hasEnoughValidSignatures(
        bytes _message,
        uint8[] _vs,
        bytes32[] _rs,
        bytes32[] _ss,
        IBridgeValidators _validatorContract) internal view {
        require(isMessageValid(_message));
        uint256 requiredSignatures = _validatorContract.requiredSignatures();
        require(_vs.length >= requiredSignatures);
        bytes32 hash = hashMessage(_message);
        address[] memory encounteredAddresses = new address[](requiredSignatures);

        for (uint256 i = 0; i < requiredSignatures; i++) {
            address recoveredAddress = ecrecover(hash, _vs[i], _rs[i], _ss[i]);
            require(_validatorContract.isValidator(recoveredAddress));
            if (addressArrayContains(encounteredAddresses, recoveredAddress)) {
                revert();
            }
            encounteredAddresses[i] = recoveredAddress;
        }
    }
}

// File: contracts/libraries/SafeMath.sol

/**
 * @title SafeMath
 * @dev Math operations with safety checks that throw on error
 */
library SafeMath {

    /**
    * @dev Multiplies two numbers, throws on overflow.
    */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }
        uint256 c = a * b;
        assert(c / a == b);
        return c;
    }

    /**
    * @dev Integer division of two numbers, truncating the quotient.
    */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        // assert(b > 0); // Solidity automatically throws when dividing by 0
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold
        return c;
    }

    /**
    * @dev Substracts two numbers, throws on overflow (i.e. if subtrahend is greater than minuend).
    */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        assert(b <= a);
        return a - b;
    }

    /**
    * @dev Adds two numbers, throws on overflow.
    */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        assert(c >= a);
        return c;
    }
}

// File: contracts/IOwnedUpgradeabilityProxy.sol

interface IOwnedUpgradeabilityProxy {
    function proxyOwner() public view returns (address);
}

// File: contracts/upgradeable_contracts/OwnedUpgradeability.sol

contract OwnedUpgradeability {

    function upgradeabilityAdmin() public view returns (address) {
        return IOwnedUpgradeabilityProxy(this).proxyOwner();
    }

    // Avoid using onlyProxyOwner name to prevent issues with implementation from proxy contract
    modifier onlyIfOwnerOfProxy() {
        require(msg.sender == upgradeabilityAdmin());
        _;
    }
}

// File: contracts/upgradeability/EternalStorage.sol

/**
 * @title EternalStorage
 * @dev This contract holds all the necessary state variables to carry out the storage of any contract.
 */
contract EternalStorage {

    mapping(bytes32 => uint256) internal uintStorage;
    mapping(bytes32 => string) internal stringStorage;
    mapping(bytes32 => address) internal addressStorage;
    mapping(bytes32 => bytes) internal bytesStorage;
    mapping(bytes32 => bool) internal boolStorage;
    mapping(bytes32 => int256) internal intStorage;

}

// File: contracts/upgradeable_contracts/Ownable.sol

/**
 * @title Ownable
 * @dev This contract has an owner address providing basic authorization control
 */
contract Ownable is EternalStorage {
    /**
    * @dev Event to show ownership has been transferred
    * @param previousOwner representing the address of the previous owner
    * @param newOwner representing the address of the new owner
    */
    event OwnershipTransferred(address previousOwner, address newOwner);

    /**
    * @dev Throws if called by any account other than the owner.
    */
    modifier onlyOwner() {
        require(msg.sender == owner());
        _;
    }

    /**
    * @dev Tells the address of the owner
    * @return the address of the owner
    */
    function owner() public view returns (address) {
        return addressStorage[keccak256("owner")];
    }

    /**
    * @dev Allows the current owner to transfer control of the contract to a newOwner.
    * @param newOwner the address to transfer ownership to.
    */
    function transferOwnership(address newOwner) public onlyOwner {
        require(newOwner != address(0));
        setOwner(newOwner);
    }

    /**
    * @dev Sets a new owner address
    */
    function setOwner(address newOwner) internal {
        emit OwnershipTransferred(owner(), newOwner);
        addressStorage[keccak256("owner")] = newOwner;
    }
}

// File: contracts/upgradeable_contracts/Validatable.sol

contract Validatable is EternalStorage {

    function validatorContract() public view returns(IBridgeValidators) {
        return IBridgeValidators(addressStorage[keccak256("validatorContract")]);
    }

    modifier onlyValidator() {
        require(validatorContract().isValidator(msg.sender));
        _;
    }
}

// File: contracts/upgradeable_contracts/U_BasicBridge.sol

contract BasicBridge is EternalStorage, Validatable, Ownable {
    event GasPriceChanged(uint256 gasPrice);
    event RequiredBlockConfirmationChanged(uint256 requiredBlockConfirmations);

    function setGasPrice(uint256 _gasPrice) public onlyOwner {
        require(_gasPrice > 0);
        uintStorage[keccak256("gasPrice")] = _gasPrice;
        emit GasPriceChanged(_gasPrice);
    }

    function gasPrice() public view returns(uint256) {
        return uintStorage[keccak256("gasPrice")];
    }

    function setRequiredBlockConfirmations(uint256 _blockConfirmations) public onlyOwner {
        require(_blockConfirmations > 0);
        uintStorage[keccak256("requiredBlockConfirmations")] = _blockConfirmations;
        emit RequiredBlockConfirmationChanged(_blockConfirmations);
    }

    function requiredBlockConfirmations() public view returns(uint256) {
        return uintStorage[keccak256("requiredBlockConfirmations")];
    }
}

// File: contracts/upgradeable_contracts/U_ForeignBridge.sol

contract ForeignBridge is ERC677Receiver, BasicBridge, OwnedUpgradeability {
    using SafeMath for uint256;
    /// triggered when relay of deposit from HomeBridge is complete
    event Deposit(address recipient, uint value, bytes32 transactionHash);

    /// Event created on money withdraw.
    event Withdraw(address recipient, uint256 value, uint256 homeGasPrice);

    /// Collected signatures which should be relayed to home chain.
    event CollectedSignatures(address authorityResponsibleForRelay, bytes32 messageHash);

    event GasConsumptionLimitsUpdated(uint256 gasLimitDepositRelay, uint256 gasLimitWithdrawConfirm);

    event SignedForDeposit(address indexed signer, bytes32 transactionHash);
    event SignedForWithdraw(address indexed signer, bytes32 messageHash);
    event DailyLimit(uint256 newLimit);
    event HomeDailyLimit(uint256 newLimit);

    function initialize(
        address _validatorContract,
        address _erc677token,
        uint256 _foreignDailyLimit,
        uint256 _maxPerTx,
        uint256 _minPerTx,
        uint256 _foreignGasPrice,
        uint256 _requiredBlockConfirmations
    ) public returns(bool) {
        require(!isInitialized());
        require(_validatorContract != address(0));
        require(_minPerTx > 0 && _maxPerTx > _minPerTx && _foreignDailyLimit > _maxPerTx);
        require(_foreignGasPrice > 0);
        addressStorage[keccak256("validatorContract")] = _validatorContract;
        setErc677token(_erc677token);
        uintStorage[keccak256("foreignDailyLimit")] = _foreignDailyLimit;
        uintStorage[keccak256("deployedAtBlock")] = block.number;
        uintStorage[keccak256("maxPerTx")] = _maxPerTx;
        uintStorage[keccak256("minPerTx")] = _minPerTx;
        uintStorage[keccak256("gasPrice")] = _foreignGasPrice;
        uintStorage[keccak256("requiredBlockConfirmations")] = _requiredBlockConfirmations;
        setInitialize(true);
        return isInitialized();
    }

    function upgradeFrom2To3() public {
        require(owner() == address(0));
        setOwner(validatorContract().owner());
    }

    function onTokenTransfer(address _from, uint256 _value, bytes /*_data*/) external returns(bool) {
        require(msg.sender == address(erc677token()));
        require(withinLimit(_value));
        setTotalSpentPerDay(getCurrentDay(), totalSpentPerDay(getCurrentDay()).add(_value));
        erc677token().burn(_value);
        emit Withdraw(_from, _value, gasPriceForCompensationAtHomeSide());
        return true;
    }

    function setMaxPerTx(uint256 _maxPerTx) external onlyOwner {
        require(_maxPerTx < foreignDailyLimit());
        uintStorage[keccak256("maxPerTx")] = _maxPerTx;
    }

    function setHomeMaxPerTx(uint256 _maxPerTx) external onlyOwner {
        require(_maxPerTx < homeDailyLimit());
        uintStorage[keccak256("homeMaxPerTx")] = _maxPerTx;
    }

    function setMinPerTx(uint256 _minPerTx) external onlyOwner {
        require(_minPerTx < foreignDailyLimit() && _minPerTx < maxPerTx());
        uintStorage[keccak256("minPerTx")] = _minPerTx;
    }

    function claimTokens(address _token, address _to) external onlyIfOwnerOfProxy {
        require(_to != address(0));
        if (_token == address(0)) {
            _to.transfer(address(this).balance);
            return;
        }

        ERC20Basic token = ERC20Basic(_token);
        uint256 balance = token.balanceOf(this);
        require(token.transfer(_to, balance));
    }

    function claimTokensFromErc677(address _token, address _to) external onlyIfOwnerOfProxy {
        erc677token().claimTokens(_token, _to);
    }

    function minPerTx() public view returns(uint256) {
        return uintStorage[keccak256("minPerTx")];
    }

    function maxPerTx() public view returns(uint256) {
        return uintStorage[keccak256("maxPerTx")];
    }

    function homeMaxPerTx() public view returns(uint256) {
        return uintStorage[keccak256("homeMaxPerTx")];
    }

    function totalSpentPerDay(uint256 _day) public view returns(uint256) {
        return uintStorage[keccak256("totalSpentPerDay", _day)];
    }

    function totalExecutedPerDay(uint256 _day) public view returns(uint256) {
        return uintStorage[keccak256("totalExecutedPerDay", _day)];
    }

    function deployedAtBlock() public view returns(uint256) {
        return uintStorage[keccak256("deployedAtBlock")];
    }

    function gasLimitDepositRelay() public view returns(uint256) {
        return uintStorage[keccak256("gasLimitDepositRelay")];
    }

    function gasLimitWithdrawConfirm() public view returns(uint256) {
        return uintStorage[keccak256("gasLimitWithdrawConfirm")];
    }

    function foreignDailyLimit() public view returns(uint256) {
        return uintStorage[keccak256("foreignDailyLimit")];
    }

    function homeDailyLimit() public view returns(uint256) {
        return uintStorage[keccak256("homeDailyLimit")];
    }

    function erc677token() public view returns(IBurnableMintableERC677Token) {
        return IBurnableMintableERC677Token(addressStorage[keccak256("erc677token")]);
    }

    function setGasLimits(uint256 _gasLimitDepositRelay, uint256 _gasLimitWithdrawConfirm) external onlyOwner {
        uintStorage[keccak256("gasLimitDepositRelay")] = _gasLimitDepositRelay;
        uintStorage[keccak256("gasLimitWithdrawConfirm")] = _gasLimitWithdrawConfirm;
        emit GasConsumptionLimitsUpdated(gasLimitDepositRelay(), gasLimitWithdrawConfirm());
    }

    function deposit(address recipient, uint256 value, bytes32 transactionHash) external onlyValidator {
        bytes32 hashMsg = keccak256(recipient, value, transactionHash);
        bytes32 hashSender = keccak256(msg.sender, hashMsg);
        require(withinHomeLimit(value));
        // Duplicated deposits
        require(!depositsSigned(hashSender));
        setDepositsSigned(hashSender, true);

        uint256 signed = numDepositsSigned(hashMsg);
        require(!isAlreadyProcessed(signed));
        // the check above assumes that the case when the value could be overflew will not happen in the addition operation below
        signed = signed + 1;

        setNumDepositsSigned(hashMsg, signed);

        emit SignedForDeposit(msg.sender, transactionHash);

        if (signed >= validatorContract().requiredSignatures()) {
            // If the bridge contract does not own enough tokens to transfer
            // it will couse funds lock on the home side of the bridge
            setTotalExecutedPerDay(getCurrentDay(), totalExecutedPerDay(getCurrentDay()).add(value));
            setNumDepositsSigned(hashMsg, markAsProcessed(signed));
            erc677token().mint(recipient, value);
            emit Deposit(recipient, value, transactionHash);
        }
    }

    /// Should be used as sync tool
    ///
    /// Message is a message that should be relayed to main chain once authorities sign it.
    ///
    /// for withdraw message contains:
    /// withdrawal recipient (bytes20)
    /// withdrawal value (uint)
    /// foreign transaction hash (bytes32) // to avoid transaction duplication
    function submitSignature(bytes signature, bytes message) external onlyValidator {
        // ensure that `signature` is really `message` signed by `msg.sender`
        require(Message.isMessageValid(message));
        require(msg.sender == Message.recoverAddressFromSignedMessage(signature, message));
        bytes32 hashMsg = keccak256(message);
        bytes32 hashSender = keccak256(msg.sender, hashMsg);

        uint256 signed = numMessagesSigned(hashMsg);
        require(!isAlreadyProcessed(signed));
        // the check above assumes that the case when the value could be overflew will not happen in the addition operation below
        signed = signed + 1;
        if (signed > 1) {
            // Duplicated signatures
            require(!messagesSigned(hashSender));
        } else {
            setMessages(hashMsg, message);
        }
        setMessagesSigned(hashSender, true);

        bytes32 signIdx = keccak256(hashMsg, (signed-1));
        setSignatures(signIdx, signature);

        setNumMessagesSigned(hashMsg, signed);

        emit SignedForWithdraw(msg.sender, hashMsg);
        if (signed >= validatorContract().requiredSignatures()) {
            setNumMessagesSigned(hashMsg, markAsProcessed(signed));
            emit CollectedSignatures(msg.sender, hashMsg);
        }
    }

    function gasPriceForCompensationAtHomeSide() public pure returns(uint256) {
        return 1000000000 wei;
    }

    function isAlreadyProcessed(uint256 _number) public pure returns(bool) {
        return _number & 2**255 == 2**255;
    }

    function signature(bytes32 _hash, uint256 _index) public view returns (bytes) {
        bytes32 signIdx = keccak256(_hash, _index);
        return signatures(signIdx);
    }

    /// Get message
    function message(bytes32 _hash) public view returns (bytes) {
        return messages(_hash);
    }

    function getCurrentDay() public view returns(uint256) {
        return now / 1 days;
    }

    function setForeignDailyLimit(uint256 _foreignDailyLimit) public onlyOwner {
        uintStorage[keccak256("foreignDailyLimit")] = _foreignDailyLimit;
        emit DailyLimit(_foreignDailyLimit);
    }

    function setHomeDailyLimit(uint256 _homeDailyLimit) external onlyOwner {
        uintStorage[keccak256("homeDailyLimit")] = _homeDailyLimit;
        emit HomeDailyLimit(_homeDailyLimit);
    }

    function withinLimit(uint256 _amount) public view returns(bool) {
        uint256 nextLimit = totalSpentPerDay(getCurrentDay()).add(_amount);
        return foreignDailyLimit() >= nextLimit && _amount <= maxPerTx() && _amount >= minPerTx();
    }

    function withinHomeLimit(uint256 _amount) public view returns(bool) {
        uint256 nextLimit = totalExecutedPerDay(getCurrentDay()).add(_amount);
        return homeDailyLimit() >= nextLimit && _amount <= homeMaxPerTx();
    }

    function isInitialized() public view returns(bool) {
        return boolStorage[keccak256("isInitialized")];
    }

    function messages(bytes32 _hash) private view returns(bytes) {
        return bytesStorage[keccak256("messages", _hash)];
    }

    function setMessages(bytes32 _hash, bytes _message) private {
        bytesStorage[keccak256("messages", _hash)] = _message;
    }

    function signatures(bytes32 _hash) private view returns(bytes) {
        return bytesStorage[keccak256("signatures", _hash)];
    }

    function setSignatures(bytes32 _hash, bytes _signature) private {
        bytesStorage[keccak256("signatures", _hash)] = _signature;
    }

    function messagesSigned(bytes32 _message) public view returns(bool) {
        return boolStorage[keccak256("messagesSigned", _message)];
    }

    function depositsSigned(bytes32 _deposit) public view returns(bool) {
        return boolStorage[keccak256("depositsSigned", _deposit)];
    }

    function markAsProcessed(uint256 _v) private pure returns(uint256) {
        return _v | 2 ** 255;
    }

    function numMessagesSigned(bytes32 _message) private view returns(uint256) {
        return uintStorage[keccak256("numMessagesSigned", _message)];
    }

    function numDepositsSigned(bytes32 _deposit) private view returns(uint256) {
        return uintStorage[keccak256("numDepositsSigned", _deposit)];
    }

    function setMessagesSigned(bytes32 _hash, bool _status) private {
        boolStorage[keccak256("messagesSigned", _hash)] = _status;
    }

    function setDepositsSigned(bytes32 _deposit, bool _status) private {
        boolStorage[keccak256("depositsSigned", _deposit)] = _status;
    }

    function setNumMessagesSigned(bytes32 _message, uint256 _number) private {
        uintStorage[keccak256("numMessagesSigned", _message)] = _number;
    }

    function setNumDepositsSigned(bytes32 _deposit, uint256 _number) private {
        uintStorage[keccak256("numDepositsSigned", _deposit)] = _number;
    }

    function setTotalSpentPerDay(uint256 _day, uint256 _value) private {
        uintStorage[keccak256("totalSpentPerDay", _day)] = _value;
    }

    function setTotalExecutedPerDay(uint256 _day, uint256 _value) private {
        uintStorage[keccak256("totalExecutedPerDay", _day)] = _value;
    }

    function setErc677token(address _token) private {
        require(_token != address(0));
        addressStorage[keccak256("erc677token")] = _token;
    }

    function setInitialize(bool _status) private {
        boolStorage[keccak256("isInitialized")] = _status;
    }

}

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Contract ABI

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Contract Creation Code

Decompile Bytecode Switch to Opcodes View

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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.

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