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0x82734Ae1E495d6e67bF12F2153659a0F74d2874B
 

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Contract Source Code Verified (Exact Match)

Contract Name:
SlowWallet

Compiler Version
v0.5.8+commit.23d335f2

Optimization Enabled:
Yes with 1 runs

Other Settings:
default evmVersion, None license
/**
 *Submitted for verification at Etherscan.io on 2021-04-23
*/

pragma solidity ^0.5.8;

/**
 * @title The standard ERC20 interface
 * @dev see https://eips.ethereum.org/EIPS/eip-20
 */
interface IERC20 {
    function transfer(address, uint256) external returns (bool);
    function approve(address, uint256) external returns (bool);
    function transferFrom(address, address, uint256) external returns (bool);
    function totalSupply() external view returns (uint256);
    function balanceOf(address) external view returns (uint256);
    function allowance(address, address) external view returns (uint256);
    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed holder, address indexed spender, uint256 value);
}

/// @title Time-delayed ERC-20 wallet contract.
/// Can only transfer tokens after publicly recording the intention to do so
/// at least four weeks in advance.
contract SlowWallet {

    // TYPES

    struct TransferProposal {
        address destination;
        uint256 value;
        uint256 time;
        string notes;
        bool closed;
    }

    // DATA

    IERC20 public token;
    uint256 public constant delay = 4 weeks;
    address public owner;

    // PROPOSALS

    mapping (uint256 => TransferProposal) public proposals;
    uint256 public proposalsLength;

    // EVENTS

    event TransferProposed(
        uint256 index,
        address indexed destination,
        uint256 value,
        uint256 delayUntil,
        string notes
    );
    event TransferConfirmed(uint256 index, address indexed destination, uint256 value, string notes);
    event TransferCancelled(uint256 index, address indexed destination, uint256 value, string notes);
    event AllTransfersCancelled();

    // FUNCTIONALITY

    constructor(address tokenAddress) public {
        token = IERC20(tokenAddress);
        owner = 0xA7b123D54BcEc14b4206dAb796982a6d5aaA6770;
    }

    modifier onlyOwner() {
        require(msg.sender == owner, "must be owner");
        _;
    }

    /// Propose a new transfer, which can be confirmed after two weeks.
    function propose(address destination, uint256 value, string calldata notes) external onlyOwner {
        // Delay by at least two weeks.
        // We are relying on block.timestamp for this, and aware of the possibility of its
        // manipulation by miners. But we are working at a timescale that is already much
        // longer than the variance in timestamps we have observed and expect in the future,
        // so we are satisfied with this choice.
        // solium-disable-next-line security/no-block-members
        uint256 delayUntil = now + delay;
        require(delayUntil >= now, "delay overflowed");

        proposals[proposalsLength] = TransferProposal({
            destination: destination,
            value: value,
            time: delayUntil,
            notes: notes,
            closed: false
        });
        proposalsLength++;

        emit TransferProposed(proposalsLength-1, destination, value, delayUntil, notes);
    }

    /// Cancel a proposed transfer.
    function cancel(uint256 index, address addr, uint256 value) external onlyOwner {
        // Check authorization.
        requireMatchingOpenProposal(index, addr, value);

        // Cancel transfer.
        proposals[index].closed = true;
        emit TransferCancelled(index, addr, value, proposals[index].notes);
    }

    /// Mark all proposals "void", in O(1).
    function voidAll() external onlyOwner {
        proposalsLength = 0;
        emit AllTransfersCancelled();
    }

    /// Confirm and execute a proposed transfer, if enough time has passed since it was proposed.
    function confirm(uint256 index, address destination, uint256 value) external onlyOwner {
        // Check authorization.
        requireMatchingOpenProposal(index, destination, value);

        // See commentary above about using `now`.
        // solium-disable-next-line security/no-block-members
        require(proposals[index].time < now, "too early");

        // Record execution of transfer.
        proposals[index].closed = true;
        emit TransferConfirmed(index, destination, value, proposals[index].notes);

        // Proceed with execution of transfer.
        require(token.transfer(destination, value));
    }

    /// Throw unless the given transfer proposal exists and matches `destination` and `value`.
    function requireMatchingOpenProposal(uint256 index, address destination, uint256 value) private view {
        require(index < proposalsLength, "index too high, or transfer voided");
        require(!proposals[index].closed, "transfer already closed");

        // Slither reports "dangerous strict equality" for each of these, but it's OK.
        // These equalities are to confirm that the transfer entered is equal to the
        // matching previous transfer. We're vetting data entry; strict equality is appropriate.
        require(proposals[index].destination == destination, "destination mismatched");
        require(proposals[index].value == value, "value mismatched");
    }
}

Contract Security Audit

Contract ABI

API
[{"constant":true,"inputs":[{"name":"","type":"uint256"}],"name":"proposals","outputs":[{"name":"destination","type":"address"},{"name":"value","type":"uint256"},{"name":"time","type":"uint256"},{"name":"notes","type":"string"},{"name":"closed","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"index","type":"uint256"},{"name":"addr","type":"address"},{"name":"value","type":"uint256"}],"name":"cancel","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"proposalsLength","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"delay","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"destination","type":"address"},{"name":"value","type":"uint256"},{"name":"notes","type":"string"}],"name":"propose","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"owner","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"voidAll","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"index","type":"uint256"},{"name":"destination","type":"address"},{"name":"value","type":"uint256"}],"name":"confirm","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"token","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"inputs":[{"name":"tokenAddress","type":"address"}],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"name":"index","type":"uint256"},{"indexed":true,"name":"destination","type":"address"},{"indexed":false,"name":"value","type":"uint256"},{"indexed":false,"name":"delayUntil","type":"uint256"},{"indexed":false,"name":"notes","type":"string"}],"name":"TransferProposed","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"name":"index","type":"uint256"},{"indexed":true,"name":"destination","type":"address"},{"indexed":false,"name":"value","type":"uint256"},{"indexed":false,"name":"notes","type":"string"}],"name":"TransferConfirmed","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"name":"index","type":"uint256"},{"indexed":true,"name":"destination","type":"address"},{"indexed":false,"name":"value","type":"uint256"},{"indexed":false,"name":"notes","type":"string"}],"name":"TransferCancelled","type":"event"},{"anonymous":false,"inputs":[],"name":"AllTransfersCancelled","type":"event"}]

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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)

0000000000000000000000008762db106b2c2a0bccb3a80d1ed41273552616e8

-----Decoded View---------------
Arg [0] : tokenAddress (address): 0x8762db106B2c2A0bccB3A80d1Ed41273552616E8

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 0000000000000000000000008762db106b2c2a0bccb3a80d1ed41273552616e8


Deployed Bytecode Sourcemap

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Swarm Source

bzzr://6811defaf98e92dd59622754e5637e22462d388026609bac1a4c78e23c7ae563

Block Transaction Difficulty Gas Used Reward
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Block Uncle Number Difficulty Gas Used Reward
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Validator Index Block Amount
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Transaction Hash Block Value Eth2 PubKey Valid
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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.