false
true
0

Contract Address Details

0x1d0DcC8d8BcaFa8e8502BEaEeF6CBD49d3AFFCDC

Contract Name
DutchAuction
Creator
0xbe4e25–38f901 at 0x4dbf95–54a417
Balance
0 PLS ( )
Tokens
Fetching tokens...
Transactions
Fetching transactions...
Transfers
Fetching transfers...
Gas Used
Fetching gas used...
Last Balance Update
26336348
Warning! Contract bytecode has been changed and doesn't match the verified one. Therefore, interaction with this smart contract may be risky.
This contract has been partially verified via Sourcify. View contract in Sourcify repository
Contract name:
DutchAuction




Optimization enabled
false
Compiler version
v0.4.10+commit.f0d539ae




Verified at
2026-04-13T00:54:40.305603Z

Constructor Arguments

000000000000000000000000851b7f3ab81bd8df354f0d7640efcd72885534190000000000000000000000000000000000000000000034f086f3b33b684000000000000000000000000000000000000000000000000000000000000000001194

Arg [0] (address) : 0x851b7f3ab81bd8df354f0d7640efcd7288553419
Arg [1] (uint256) : 250000000000000000000000
Arg [2] (uint256) : 4500

DutchAuction.sol

pragma solidity 0.4.10;


/// @title Abstract token contract - Functions to be implemented by token contracts.
contract Token {
    function transfer(address to, uint256 value) returns (bool success);
    function transferFrom(address from, address to, uint256 value) returns (bool success);
    function approve(address spender, uint256 value) returns (bool success);

    // This is not an abstract function, because solc won't recognize generated getter functions for public variables as functions.
    function totalSupply() constant returns (uint256 supply) {}
    function balanceOf(address owner) constant returns (uint256 balance);
    function allowance(address owner, address spender) constant returns (uint256 remaining);

    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed owner, address indexed spender, uint256 value);
}


/// @title Dutch auction contract - distribution of Gnosis tokens using an auction.
/// @author Stefan George - <stefan.george@consensys.net>
contract DutchAuction {

    /*
     *  Events
     */
    event BidSubmission(address indexed sender, uint256 amount);

    /*
     *  Constants
     */
    uint constant public MAX_TOKENS_SOLD = 9000000 * 10**18; // 9M
    uint constant public WAITING_PERIOD = 7 days;

    /*
     *  Storage
     */
    Token public gnosisToken;
    address public wallet;
    address public owner;
    uint public ceiling;
    uint public priceFactor;
    uint public startBlock;
    uint public endTime;
    uint public totalReceived;
    uint public finalPrice;
    mapping (address => uint) public bids;
    Stages public stage;

    /*
     *  Enums
     */
    enum Stages {
        AuctionDeployed,
        AuctionSetUp,
        AuctionStarted,
        AuctionEnded,
        TradingStarted
    }

    /*
     *  Modifiers
     */
    modifier atStage(Stages _stage) {
        if (stage != _stage)
            // Contract not in expected state
            throw;
        _;
    }

    modifier isOwner() {
        if (msg.sender != owner)
            // Only owner is allowed to proceed
            throw;
        _;
    }

    modifier isWallet() {
        if (msg.sender != wallet)
            // Only wallet is allowed to proceed
            throw;
        _;
    }

    modifier isValidPayload() {
        if (msg.data.length != 4 && msg.data.length != 36)
            throw;
        _;
    }

    modifier timedTransitions() {
        if (stage == Stages.AuctionStarted && calcTokenPrice() <= calcStopPrice())
            finalizeAuction();
        if (stage == Stages.AuctionEnded && now > endTime + WAITING_PERIOD)
            stage = Stages.TradingStarted;
        _;
    }

    /*
     *  Public functions
     */
    /// @dev Contract constructor function sets owner.
    /// @param _wallet Gnosis wallet.
    /// @param _ceiling Auction ceiling.
    /// @param _priceFactor Auction price factor.
    function DutchAuction(address _wallet, uint _ceiling, uint _priceFactor)
        public
    {
        if (_wallet == 0 || _ceiling == 0 || _priceFactor == 0)
            // Arguments are null.
            throw;
        owner = msg.sender;
        wallet = _wallet;
        ceiling = _ceiling;
        priceFactor = _priceFactor;
        stage = Stages.AuctionDeployed;
    }

    /// @dev Setup function sets external contracts' addresses.
    /// @param _gnosisToken Gnosis token address.
    function setup(address _gnosisToken)
        public
        isOwner
        atStage(Stages.AuctionDeployed)
    {
        if (_gnosisToken == 0)
            // Argument is null.
            throw;
        gnosisToken = Token(_gnosisToken);
        // Validate token balance
        if (gnosisToken.balanceOf(this) != MAX_TOKENS_SOLD)
            throw;
        stage = Stages.AuctionSetUp;
    }

    /// @dev Starts auction and sets startBlock.
    function startAuction()
        public
        isWallet
        atStage(Stages.AuctionSetUp)
    {
        stage = Stages.AuctionStarted;
        startBlock = block.number;
    }

    /// @dev Changes auction ceiling and start price factor before auction is started.
    /// @param _ceiling Updated auction ceiling.
    /// @param _priceFactor Updated start price factor.
    function changeSettings(uint _ceiling, uint _priceFactor)
        public
        isWallet
        atStage(Stages.AuctionSetUp)
    {
        ceiling = _ceiling;
        priceFactor = _priceFactor;
    }

    /// @dev Calculates current token price.
    /// @return Returns token price.
    function calcCurrentTokenPrice()
        public
        timedTransitions
        returns (uint)
    {
        if (stage == Stages.AuctionEnded || stage == Stages.TradingStarted)
            return finalPrice;
        return calcTokenPrice();
    }

    /// @dev Returns correct stage, even if a function with timedTransitions modifier has not yet been called yet.
    /// @return Returns current auction stage.
    function updateStage()
        public
        timedTransitions
        returns (Stages)
    {
        return stage;
    }

    /// @dev Allows to send a bid to the auction.
    /// @param receiver Bid will be assigned to this address if set.
    function bid(address receiver)
        public
        payable
        isValidPayload
        timedTransitions
        atStage(Stages.AuctionStarted)
        returns (uint amount)
    {
        // If a bid is done on behalf of a user via ShapeShift, the receiver address is set.
        if (receiver == 0)
            receiver = msg.sender;
        amount = msg.value;
        // Prevent that more than 90% of tokens are sold. Only relevant if cap not reached.
        uint maxWei = (MAX_TOKENS_SOLD / 10**18) * calcTokenPrice() - totalReceived;
        uint maxWeiBasedOnTotalReceived = ceiling - totalReceived;
        if (maxWeiBasedOnTotalReceived < maxWei)
            maxWei = maxWeiBasedOnTotalReceived;
        // Only invest maximum possible amount.
        if (amount > maxWei) {
            amount = maxWei;
            // Send change back to receiver address. In case of a ShapeShift bid the user receives the change back directly.
            if (!receiver.send(msg.value - amount))
                // Sending failed
                throw;
        }
        // Forward funding to ether wallet
        if (amount == 0 || !wallet.send(amount))
            // No amount sent or sending failed
            throw;
        bids[receiver] += amount;
        totalReceived += amount;
        if (maxWei == amount)
            // When maxWei is equal to the big amount the auction is ended and finalizeAuction is triggered.
            finalizeAuction();
        BidSubmission(receiver, amount);
    }

    /// @dev Claims tokens for bidder after auction.
    /// @param receiver Tokens will be assigned to this address if set.
    function claimTokens(address receiver)
        public
        isValidPayload
        timedTransitions
        atStage(Stages.TradingStarted)
    {
        if (receiver == 0)
            receiver = msg.sender;
        uint tokenCount = bids[receiver] * 10**18 / finalPrice;
        bids[receiver] = 0;
        gnosisToken.transfer(receiver, tokenCount);
    }

    /// @dev Calculates stop price.
    /// @return Returns stop price.
    function calcStopPrice()
        constant
        public
        returns (uint)
    {
        return totalReceived * 10**18 / MAX_TOKENS_SOLD + 1;
    }

    /// @dev Calculates token price.
    /// @return Returns token price.
    function calcTokenPrice()
        constant
        public
        returns (uint)
    {
        return priceFactor * 10**18 / (block.number - startBlock + 7500) + 1;
    }

    /*
     *  Private functions
     */
    function finalizeAuction()
        private
    {
        stage = Stages.AuctionEnded;
        if (totalReceived == ceiling)
            finalPrice = calcTokenPrice();
        else
            finalPrice = calcStopPrice();
        uint soldTokens = totalReceived * 10**18 / finalPrice;
        // Auction contract transfers all unsold tokens to Gnosis inventory multisig
        gnosisToken.transfer(wallet, MAX_TOKENS_SOLD - soldTokens);
        endTime = now;
    }
}

Compiler Settings

{"remappings":[],"optimizer":{"runs":200,"enabled":false},"libraries":{},"compilationTarget":{"DutchAuction.sol":"DutchAuction"}}

Contract ABI

[{"type":"function","payable":false,"outputs":[{"type":"uint256","name":""}],"name":"MAX_TOKENS_SOLD","inputs":[],"constant":true},{"type":"function","payable":false,"outputs":[{"type":"uint256","name":""}],"name":"endTime","inputs":[],"constant":true},{"type":"function","payable":false,"outputs":[],"name":"changeSettings","inputs":[{"type":"uint256","name":"_ceiling"},{"type":"uint256","name":"_priceFactor"}],"constant":false},{"type":"function","payable":false,"outputs":[{"type":"uint256","name":""}],"name":"calcTokenPrice","inputs":[],"constant":true},{"type":"function","payable":false,"outputs":[{"type":"uint256","name":""}],"name":"startBlock","inputs":[],"constant":true},{"type":"function","payable":false,"outputs":[{"type":"address","name":""}],"name":"wallet","inputs":[],"constant":true},{"type":"function","payable":false,"outputs":[{"type":"address","name":""}],"name":"gnosisToken","inputs":[],"constant":true},{"type":"function","payable":false,"outputs":[{"type":"uint256","name":""}],"name":"bids","inputs":[{"type":"address","name":""}],"constant":true},{"type":"function","payable":false,"outputs":[],"name":"setup","inputs":[{"type":"address","name":"_gnosisToken"}],"constant":false},{"type":"function","payable":false,"outputs":[],"name":"startAuction","inputs":[],"constant":false},{"type":"function","payable":false,"outputs":[{"type":"uint256","name":""}],"name":"WAITING_PERIOD","inputs":[],"constant":true},{"type":"function","payable":false,"outputs":[{"type":"uint256","name":""}],"name":"ceiling","inputs":[],"constant":true},{"type":"function","payable":false,"outputs":[{"type":"address","name":""}],"name":"owner","inputs":[],"constant":true},{"type":"function","payable":true,"outputs":[{"type":"uint256","name":"amount"}],"name":"bid","inputs":[{"type":"address","name":"receiver"}],"constant":false},{"type":"function","payable":false,"outputs":[{"type":"uint256","name":""}],"name":"totalReceived","inputs":[],"constant":true},{"type":"function","payable":false,"outputs":[{"type":"uint256","name":""}],"name":"finalPrice","inputs":[],"constant":true},{"type":"function","payable":false,"outputs":[{"type":"uint8","name":""}],"name":"stage","inputs":[],"constant":true},{"type":"function","payable":false,"outputs":[{"type":"uint8","name":""}],"name":"updateStage","inputs":[],"constant":false},{"type":"function","payable":false,"outputs":[{"type":"uint256","name":""}],"name":"calcCurrentTokenPrice","inputs":[],"constant":false},{"type":"function","payable":false,"outputs":[{"type":"uint256","name":""}],"name":"calcStopPrice","inputs":[],"constant":true},{"type":"function","payable":false,"outputs":[],"name":"claimTokens","inputs":[{"type":"address","name":"receiver"}],"constant":false},{"type":"function","payable":false,"outputs":[{"type":"uint256","name":""}],"name":"priceFactor","inputs":[],"constant":true},{"type":"constructor","payable":false,"inputs":[{"type":"address","name":"_wallet"},{"type":"uint256","name":"_ceiling"},{"type":"uint256","name":"_priceFactor"}]},{"type":"event","name":"BidSubmission","inputs":[{"type":"address","name":"sender","indexed":true},{"type":"uint256","name":"amount","indexed":false}],"anonymous":false}]

Contract Creation Code

Verify & Publish 
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Deployed ByteCode

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