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Method
Block
From
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Start Auction52742572018-03-18 0:11:212670 days ago1521331881IN
0xB0E67450...f327eb5d9
0 ETH0.000317242
Start Auction52742132018-03-18 0:00:002670 days ago1521331200IN
0xB0E67450...f327eb5d9
0 ETH0.00037752

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Similar Match Source Code
This contract matches the deployed Bytecode of the Source Code for Contract 0xe3f4383c...DbeD29890
The constructor portion of the code might be different and could alter the actual behaviour of the contract

Contract Name:
ERC721Auction

Compiler Version
v0.4.21+commit.dfe3193c

Optimization Enabled:
No with 200 runs

Other Settings:
default evmVersion

Contract Source Code (Solidity)

/**
 *Submitted for verification at Etherscan.io on 2018-03-18
*/

pragma solidity ^0.4.18;


/**
 * @title Ownable
 * @dev The Ownable contract has an owner address, and provides basic authorization control
 * functions, this simplifies the implementation of "user permissions".
 */
contract Ownable {
    address public owner;


    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);


    /**
     * @dev The Ownable constructor sets the original `owner` of the contract to the sender
     * account.
     */
    function Ownable() public {
        owner = msg.sender;
    }


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

}






contract Beneficiary is Ownable {

    address public beneficiary;

    function Beneficiary() public {
        beneficiary = msg.sender;
    }

    function setBeneficiary(address _beneficiary) onlyOwner public {
        beneficiary = _beneficiary;
    }


}


/// @title Auction contract for any type of erc721 token
/// @author Fishbank

contract ERC721 {

    function implementsERC721() public pure returns (bool);

    function totalSupply() public view returns (uint256 total);

    function balanceOf(address _owner) public view returns (uint256 balance);

    function ownerOf(uint256 _tokenId) public view returns (address owner);

    function approve(address _to, uint256 _tokenId) public;

    function transferFrom(address _from, address _to, uint256 _tokenId) public returns (bool);

    function transfer(address _to, uint256 _tokenId) public returns (bool);

    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);

    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);

    // Optional
    // function name() public view returns (string name);
    // function symbol() public view returns (string symbol);
    // function tokenOfOwnerByIndex(address _owner, uint256 _index) external view returns (uint256 tokenId);
    // function tokenMetadata(uint256 _tokenId) public view returns (string infoUrl);
}


contract ERC721Auction is Beneficiary {

    struct Auction {
        address seller;
        uint256 tokenId;
        uint64 auctionBegin;
        uint64 auctionEnd;
        uint256 startPrice;
        uint256 endPrice;
    }

    uint32 public auctionDuration = 7 days;

    ERC721 public ERC721Contract;
    uint256 public fee = 45000; //in 1 10000th of a percent so 4.5% at the start
    uint256 constant FEE_DIVIDER = 1000000;
    mapping(uint256 => Auction) public auctions;

    event AuctionWon(uint256 indexed tokenId, address indexed winner, address indexed seller, uint256 price);

    event AuctionStarted(uint256 indexed tokenId, address indexed seller);

    event AuctionFinalized(uint256 indexed tokenId, address indexed seller);


    function startAuction(uint256 _tokenId, uint256 _startPrice, uint256 _endPrice) external {
        require(ERC721Contract.transferFrom(msg.sender, address(this), _tokenId));
        //Prices must be in range from 0.01 Eth and 10 000 Eth
        require(_startPrice <= 10000 ether && _endPrice <= 10000 ether);
        require(_startPrice >= (1 ether / 100) && _endPrice >= (1 ether / 100));

        Auction memory auction;

        auction.seller = msg.sender;
        auction.tokenId = _tokenId;
        auction.auctionBegin = uint64(now);
        auction.auctionEnd = uint64(now + auctionDuration);
        require(auction.auctionEnd > auction.auctionBegin);
        auction.startPrice = _startPrice;
        auction.endPrice = _endPrice;

        auctions[_tokenId] = auction;

        AuctionStarted(_tokenId, msg.sender);
    }


    function buyAuction(uint256 _tokenId) payable external {
        Auction storage auction = auctions[_tokenId];

        uint256 price = calculateBid(_tokenId);
        uint256 totalFee = price * fee / FEE_DIVIDER; //safe math needed?

        require(price <= msg.value); //revert if not enough ether send

        if (price != msg.value) {//send back to much eth
            msg.sender.transfer(msg.value - price);
        }

        beneficiary.transfer(totalFee);

        auction.seller.transfer(price - totalFee);

        if (!ERC721Contract.transfer(msg.sender, _tokenId)) {
            revert();
            //can't complete transfer if this fails
        }

        AuctionWon(_tokenId, msg.sender, auction.seller, price);

        delete auctions[_tokenId];
        //deletes auction
    }

    function saveToken(uint256 _tokenId) external {
        require(auctions[_tokenId].auctionEnd < now);
        //auction must have ended
        require(ERC721Contract.transfer(auctions[_tokenId].seller, _tokenId));
        //transfer fish back to seller

        AuctionFinalized(_tokenId, auctions[_tokenId].seller);

        delete auctions[_tokenId];
        //delete auction
    }

    function ERC721Auction(address _ERC721Contract) public {
        ERC721Contract = ERC721(_ERC721Contract);
    }

    function setFee(uint256 _fee) onlyOwner public {
        if (_fee > fee) {
            revert(); //fee can only be set to lower value to prevent attacks by owner
        }
        fee = _fee; // all is well set fee
    }

    function calculateBid(uint256 _tokenId) public view returns (uint256) {
        Auction storage auction = auctions[_tokenId];

        if (now >= auction.auctionEnd) {//if auction ended return auction end price
            return auction.endPrice;
        }
        //get hours passed
        uint256 hoursPassed = (now - auction.auctionBegin) / 1 hours;
        uint256 currentPrice;
        //get total hours
        uint16 totalHours = uint16(auctionDuration /1 hours) - 1;

        if (auction.endPrice > auction.startPrice) {
            currentPrice = auction.startPrice + (hoursPassed * (auction.endPrice - auction.startPrice))/ totalHours;
        } else if(auction.endPrice < auction.startPrice) {
            currentPrice = auction.startPrice - (hoursPassed * (auction.startPrice - auction.endPrice))/ totalHours;
        } else {//start and end are the same
            currentPrice = auction.endPrice;
        }

        return uint256(currentPrice);
        //return the price at this very moment
    }

    /// return token if case when need to redeploy auction contract
    function returnToken(uint256 _tokenId) onlyOwner public {
        require(ERC721Contract.transfer(auctions[_tokenId].seller, _tokenId));
        //transfer fish back to seller

        AuctionFinalized(_tokenId, auctions[_tokenId].seller);

        delete auctions[_tokenId];
    }
}

Contract Security Audit

Contract ABI

API
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Deployed Bytecode

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Swarm Source

bzzr://30a91d0528fe6833ae1780657eb4769742e7e04e234f8e692c4c9e9893f23278

Block Uncle Number Difficulty Gas Used Reward
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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.