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Contract

0xA0A5bb7B563461A586C1bd6D635Ba9Fde7315008
 

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$0.00

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TokenTracker

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Transaction Hash
Method
Block
From
To
Transfer From146218222022-04-20 12:10:00937 days ago1650456600IN
0xA0A5bb7B...de7315008
0 ETH0.0027197624.85297418
Mint143705732022-03-12 7:25:18976 days ago1647069918IN
0xA0A5bb7B...de7315008
0 ETH0.0012313711
Transfer From139526582022-01-06 15:24:381041 days ago1641482678IN
0xA0A5bb7B...de7315008
0 ETH0.01377526149.03460823
Transfer From139526472022-01-06 15:22:251041 days ago1641482545IN
0xA0A5bb7B...de7315008
0 ETH0.01975863172.82111773
Set Approval For...118923902021-02-20 7:05:551361 days ago1613804755IN
0xA0A5bb7B...de7315008
0 ETH0.00681796152
Transfer From118826052021-02-18 19:03:061363 days ago1613674986IN
0xA0A5bb7B...de7315008
0 ETH0.0117642140
Mint118509332021-02-13 22:22:041368 days ago1613254924IN
0xA0A5bb7B...de7315008
0 ETH0.03012741122
Set Approval For...117284802021-01-26 1:48:211386 days ago1611625701IN
0xA0A5bb7B...de7315008
0 ETH0.0030475367.96
Mint117282742021-01-26 1:05:551386 days ago1611623155IN
0xA0A5bb7B...de7315008
0 ETH0.0190148477
Mint114682312020-12-17 3:32:251426 days ago1608175945IN
0xA0A5bb7B...de7315008
0 ETH0.02783352120
Safe Transfer Fr...112633252020-11-15 15:55:581458 days ago1605455758IN
0xA0A5bb7B...de7315008
0 ETH0.0567502840
Mint112633162020-11-15 15:54:551458 days ago1605455695IN
0xA0A5bb7B...de7315008
0 ETH0.012347350
Safe Transfer Fr...112376602020-11-11 17:25:381462 days ago1605115538IN
0xA0A5bb7B...de7315008
0 ETH0.3981196181
Mint111409122020-10-27 20:54:441477 days ago1603832084IN
0xA0A5bb7B...de7315008
0 ETH0.0056488822.875
Transfer From109629722020-09-30 9:38:511504 days ago1601458731IN
0xA0A5bb7B...de7315008
0 ETH0.0126045150
Mint109629322020-09-30 9:28:171504 days ago1601458097IN
0xA0A5bb7B...de7315008
0 ETH0.03210298130
Mint108562652020-09-13 22:09:141521 days ago1600034954IN
0xA0A5bb7B...de7315008
0 ETH0.0194834684
Mint108117962020-09-07 2:21:591527 days ago1599445319IN
0xA0A5bb7B...de7315008
0 ETH0.0209904185.00000145
Mint108087012020-09-06 15:11:001528 days ago1599405060IN
0xA0A5bb7B...de7315008
0.005 ETH0.03202332120
Set Approval For...107965082020-09-04 18:31:291530 days ago1599244289IN
0xA0A5bb7B...de7315008
0 ETH0.00578181128.90019051
Mint107958862020-09-04 16:13:521530 days ago1599236032IN
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0.005 ETH0.08563274340
Mint107958432020-09-04 16:02:211530 days ago1599235341IN
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0.005 ETH0.08059552320
Mint107958312020-09-04 15:59:311530 days ago1599235171IN
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0.005 ETH0.08563274340
Mint107957922020-09-04 15:51:471530 days ago1599234707IN
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0.005 ETH0.0755583300
Mint107957502020-09-04 15:41:451530 days ago1599234105IN
0xA0A5bb7B...de7315008
0.005 ETH0.08059552320
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108087012020-09-06 15:11:001528 days ago1599405060
0xA0A5bb7B...de7315008
0.005 ETH
107958862020-09-04 16:13:521530 days ago1599236032
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0.005 ETH
107958432020-09-04 16:02:211530 days ago1599235341
0xA0A5bb7B...de7315008
0.005 ETH
107958312020-09-04 15:59:311530 days ago1599235171
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0.005 ETH
107957922020-09-04 15:51:471530 days ago1599234707
0xA0A5bb7B...de7315008
0.005 ETH
107957502020-09-04 15:41:451530 days ago1599234105
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0.005 ETH
107957242020-09-04 15:35:171530 days ago1599233717
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107957072020-09-04 15:31:371530 days ago1599233497
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0.005 ETH
107956912020-09-04 15:27:521530 days ago1599233272
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0.005 ETH
107503522020-08-28 16:49:251537 days ago1598633365
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0.005 ETH
107360202020-08-26 12:12:291539 days ago1598443949
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0.005 ETH
107359892020-08-26 12:06:151539 days ago1598443575
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107286102020-08-25 8:49:201540 days ago1598345360
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107220252020-08-24 8:39:511541 days ago1598258391
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107220152020-08-24 8:37:041541 days ago1598258224
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107158902020-08-23 9:59:261542 days ago1598176766
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106840922020-08-18 12:53:031547 days ago1597755183
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106610812020-08-14 23:23:261551 days ago1597447406
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106277842020-08-09 20:08:411556 days ago1597003721
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106219252020-08-08 22:41:311557 days ago1596926491
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106046012020-08-06 6:41:281559 days ago1596696088
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106046002020-08-06 6:41:201559 days ago1596696080
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106046002020-08-06 6:41:201559 days ago1596696080
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106044292020-08-06 5:58:181559 days ago1596693498
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105990512020-08-05 9:52:141560 days ago1596621134
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Contract Source Code Verified (Exact Match)

Contract Name:
EthArt721

Compiler Version
v0.6.10+commit.00c0fcaf

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion, MIT license

Contract Source Code (Solidity Multiple files format)

File 1 of 7: EthArt721.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

import "./Context.sol";
import "./SafeMath.sol";
import "./EnumerableMap.sol";
import "./EnumerableSet.sol";
import "./Address.sol";
import "./Strings.sol";

interface IERC165 {
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

interface IERC721 {

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

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

    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);

    function balanceOf(address owner) external view returns (uint256 balance);

    function ownerOf(uint256 tokenId) external view returns (address owner);

    function safeTransferFrom(address from, address to, uint256 tokenId) external;

    function transferFrom(address from, address to, uint256 tokenId) external;

    function approve(address to, uint256 tokenId) external;

    function getApproved(uint256 tokenId) external view returns (address operator);

    function setApprovalForAll(address operator, bool _approved) external;

    function isApprovedForAll(address owner, address operator) external view returns (bool);

    function safeTransferFrom(address from, address to, uint256 tokenId, bytes calldata data) external;
}

interface IERC721Metadata {

    function name() external view returns (string memory);

    function symbol() external view returns (string memory);

    function tokenURI(uint256 tokenId) external view returns (string memory);
}

interface IERC721Enumerable {

    function totalSupply() external view returns (uint256);

    function tokenOfOwnerByIndex(address owner, uint256 index) external view returns (uint256 tokenId);

    function tokenByIndex(uint256 index) external view returns (uint256);
}

interface IEthArt721 {
    function getProxy() external view returns (address);
    function setProxy(address proxy) external;

    function mint(bytes calldata payload, string calldata tokenURI, uint256 tokenId, bool finalize, bytes calldata data) external payable returns(uint256);

    function content(uint256 tokenId, uint256 position) external view returns(bytes memory);

    function metadata(uint256 tokenId) external view returns(uint256, uint256, bool);

    event Finalized(uint256 indexed tokenId, uint256 chainSize);
}

contract EthArt721 is IEthArt721, IERC165, IERC721, IERC721Metadata, IERC721Enumerable, Context {
    using SafeMath for uint256;
    using Address for address;
    using EnumerableSet for EnumerableSet.UintSet;
    using EnumerableMap for EnumerableMap.UintToAddressMap;
    using Strings for uint256;

    bytes4 private constant _ERC721_RECEIVED = 0x150b7a02;

    bytes32 private constant EMPTY_STRING = keccak256("");

    bytes4 private constant _INTERFACE_ID_ERC165 = 0x01ffc9a7;
    bytes4 private constant _INTERFACE_ID_ERC721 = 0x80ac58cd;
    bytes4 private constant _INTERFACE_ID_ERC721_METADATA = 0x5b5e139f;
    bytes4 private constant _INTERFACE_ID_ERC721_ENUMERABLE = 0x780e9d63;

    address private _proxy;

    mapping (address => EnumerableSet.UintSet) private _holderTokens;

    EnumerableMap.UintToAddressMap private _tokenOwners;

    mapping (uint256 => address) private _tokenApprovals;

    mapping (address => mapping (address => bool)) private _operatorApprovals;

    string private _name;

    string private _symbol;

    mapping (uint256 => string) private _tokenURIs;

    string private _baseURI;

    mapping(uint256 => bytes[]) private _chain;
    mapping(uint256 => bool) private _finalized;

    constructor (string memory name, string memory symbol, address proxy) public {
        _name = name;
        _symbol = symbol;
        setProxy(proxy);
    }

    function supportsInterface(bytes4 interfaceId) public view override returns (bool) {
        return
        interfaceId == _INTERFACE_ID_ERC165 ||
        interfaceId == _INTERFACE_ID_ERC721 ||
        interfaceId == _INTERFACE_ID_ERC721_METADATA ||
        interfaceId == _INTERFACE_ID_ERC721_ENUMERABLE;
    }

    function setProxy(address proxy) public override {
        require(_proxy == address(0) || IMVDFunctionalitiesManager(IMVDProxy(_proxy).getMVDFunctionalitiesManagerAddress()).isAuthorizedFunctionality(msg.sender), "Unauthorized action!");
        _proxy = proxy;
    }

    function getProxy() public override view returns (address) {
        return _proxy;
    }

    function balanceOf(address owner) public view override returns (uint256) {
        require(owner != address(0), "ERC721: balance query for the zero address");
        return _holderTokens[owner].length();
    }

    function ownerOf(uint256 tokenId) public view override returns (address) {
        return _tokenOwners.get(tokenId, "ERC721: owner query for nonexistent token");
    }

    function name() public view override returns (string memory) {
        return _name;
    }

    function symbol() public view override returns (string memory) {
        return _symbol;
    }

    function tokenURI(uint256 tokenId) public view override returns (string memory) {
        require(_exists(tokenId), "ERC721Metadata: URI query for nonexistent token");

        string memory _tokenURI = _tokenURIs[tokenId];

        if (bytes(_baseURI).length == 0) {
            return _tokenURI;
        }
        if (bytes(_tokenURI).length > 0) {
            return string(abi.encodePacked(_baseURI, _tokenURI));
        }
        return string(abi.encodePacked(_baseURI, tokenId.toString()));
    }

    function baseURI() public view returns (string memory) {
        return _baseURI;
    }

    function tokenOfOwnerByIndex(address owner, uint256 index) public view override returns (uint256) {
        return _holderTokens[owner].at(index);
    }

    function totalSupply() public view override returns (uint256) {
        return _tokenOwners.length();
    }

    function tokenByIndex(uint256 index) public view override returns (uint256) {
        (uint256 tokenId, ) = _tokenOwners.at(index);
        return tokenId;
    }

    function approve(address to, uint256 tokenId) public virtual override {
        address owner = ownerOf(tokenId);
        require(to != owner, "ERC721: approval to current owner");
        require(_msgSender() == owner || isApprovedForAll(owner, _msgSender()),
            "ERC721: approve caller is not owner nor approved for all"
        );
        _approve(to, tokenId);
    }

    function getApproved(uint256 tokenId) public view override returns (address) {
        require(_exists(tokenId), "ERC721: approved query for nonexistent token");
        return _tokenApprovals[tokenId];
    }

    function setApprovalForAll(address operator, bool approved) public virtual override {
        require(operator != _msgSender(), "ERC721: approve to caller");

        _operatorApprovals[_msgSender()][operator] = approved;
        emit ApprovalForAll(_msgSender(), operator, approved);
    }

    function isApprovedForAll(address owner, address operator) public view override returns (bool) {
        return _operatorApprovals[owner][operator];
    }

    function transferFrom(address from, address to, uint256 tokenId) public virtual override {
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved");
        _transfer(from, to, tokenId);
    }

    function safeTransferFrom(address from, address to, uint256 tokenId) public virtual override {
        safeTransferFrom(from, to, tokenId, "");
    }

    function safeTransferFrom(address from, address to, uint256 tokenId, bytes memory _data) public virtual override {
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved");
        _safeTransfer(from, to, tokenId, _data);
    }

    function _safeTransfer(address from, address to, uint256 tokenId, bytes memory _data) internal virtual {
        _transfer(from, to, tokenId);
        require(_checkOnERC721Received(from, to, tokenId, _data), "ERC721: transfer to non ERC721Receiver implementer");
    }

    function _exists(uint256 tokenId) internal view returns (bool) {
        return _tokenOwners.contains(tokenId);
    }

    function _isApprovedOrOwner(address spender, uint256 tokenId) internal view returns (bool) {
        require(_exists(tokenId), "ERC721: operator query for nonexistent token");
        address owner = ownerOf(tokenId);
        return (spender == owner || getApproved(tokenId) == spender || isApprovedForAll(owner, spender));
    }

    function mint(bytes memory payload, string memory tokenURI, uint256 tokenId, bool finalize, bytes memory data) public override payable returns(uint256 newTokenId) {
        uint256 length = totalSupply();
        require(tokenId == 0 || tokenId <= length, "Unexisting Token");
        newTokenId = tokenId == 0 ? length + 1 : tokenId;

        require(newTokenId == (length + 1) || ownerOf(newTokenId) == msg.sender, "Finalize or extend an already-finalized or an already-existing chain of someone else is forbidden");

        if(newTokenId == length + 1) {
            _mint(msg.sender, newTokenId, data);
            require(keccak256(bytes(tokenURI)) != keccak256(""), "tokenURI Cannot be empty!");
            _setTokenURI(newTokenId, tokenURI);
        }

        bool empty = keccak256(payload) == keccak256("");
        if(!empty) {
            require(!_finalized[newTokenId], "Cannot concatenate already finalized tokens");
            _chain[newTokenId].push(payload);
        }

        if(finalize || empty) {
            require(!_finalized[newTokenId], "Cannot Finalize already finalized tokens");
            _finalized[newTokenId] = true;
            emit Finalized(newTokenId, _chain[newTokenId].length);
        }

        if(msg.value > 0) {
            require(_proxy != address(0), "Cannot receive donations, proxy not set!");
            address payable wallet = payable(IStateHolder(IMVDProxy(_proxy).getStateHolderAddress()).getAddress("dfoHubWallet"));
            wallet.transfer(msg.value);
        }
    }

    function content(uint256 tokenId, uint256 position) public override view returns(bytes memory) {
        return _chain[tokenId][position];
    }

    function metadata(uint256 tokenId) public override view returns(uint256, uint256, bool) {
        return (_chain[tokenId].length, _chain[tokenId][0].length, _finalized[tokenId]);
    }

    function _mint(address to, uint256 tokenId, bytes memory _data) internal virtual {
        require(to != address(0), "ERC721: mint to the zero address");
        require(!_exists(tokenId), "ERC721: token already minted");

        _holderTokens[to].add(tokenId);

        _tokenOwners.set(tokenId, to);

        emit Transfer(address(0), to, tokenId);

        require(_checkOnERC721Received(address(0), to, tokenId, _data), "ERC721: transfer to non ERC721Receiver implementer");
    }

    function _burn(uint256 tokenId) internal virtual {
        address owner = ownerOf(tokenId);

        _approve(address(0), tokenId);

        if (bytes(_tokenURIs[tokenId]).length != 0) {
            delete _tokenURIs[tokenId];
        }

        _holderTokens[owner].remove(tokenId);

        _tokenOwners.remove(tokenId);

        emit Transfer(owner, address(0), tokenId);
    }

    function _transfer(address from, address to, uint256 tokenId) internal virtual {
        require(ownerOf(tokenId) == from, "ERC721: transfer of token that is not own");
        require(to != address(0), "ERC721: transfer to the zero address");

        _approve(address(0), tokenId);

        _holderTokens[from].remove(tokenId);
        _holderTokens[to].add(tokenId);

        _tokenOwners.set(tokenId, to);

        emit Transfer(from, to, tokenId);
    }

    function _setTokenURI(uint256 tokenId, string memory _tokenURI) internal virtual {
        require(_exists(tokenId), "ERC721Metadata: URI set of nonexistent token");
        _tokenURIs[tokenId] = _tokenURI;
    }

    function _setBaseURI(string memory baseURI_) internal virtual {
        _baseURI = baseURI_;
    }

    function _approve(address to, uint256 tokenId) private {
        _tokenApprovals[tokenId] = to;
        emit Approval(ownerOf(tokenId), to, tokenId);
    }

    function _checkOnERC721Received(address from, address to, uint256 tokenId, bytes memory _data) public returns (bool) {
        if (!_isContract(to)) {
            return true;
        }
        (bool success, bytes memory returndata) = to.call(abi.encodeWithSelector(
            IERC721Receiver(to).onERC721Received.selector,
            _msgSender(),
            from,
            tokenId,
            _data
        ));
        if (!success) {
            if (returndata.length > 0) {
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert("ERC721: transfer to non ERC721Receiver implementer");
            }
        } else {
            bytes4 retval = abi.decode(returndata, (bytes4));
            return (retval == _ERC721_RECEIVED);
        }
    }

    function _isContract(address account) private view returns (bool) {
        bytes32 codehash;
        bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
        assembly { codehash := extcodehash(account) }
        return (codehash != accountHash && codehash != 0x0);
    }
}

interface IERC721Receiver {
    function onERC721Received(address operator, address from, uint256 tokenId, bytes calldata data) external returns (bytes4);
}

interface IMVDProxy {
    function getToken() external view returns(address);
    function getMVDFunctionalitiesManagerAddress() external view returns(address);
    function getStateHolderAddress() external view returns(address);
    function submit(string calldata codeName, bytes calldata data) external payable returns(bytes memory returnData);
}

interface IMVDFunctionalitiesManager {
    function isAuthorizedFunctionality(address functionality) external view returns(bool);
}

interface IStateHolder {
    function exists(string calldata varName) external view returns(bool);
    function clear(string calldata varName) external returns(string memory oldDataType, bytes memory oldVal);
    function setBytes(string calldata varName, bytes calldata val) external returns(bytes memory);
    function getBytes(string calldata varName) external view returns(bytes memory);
    function setString(string calldata varName, string calldata val) external returns(string memory);
    function getString(string calldata varName) external view returns (string memory);
    function setBool(string calldata varName, bool val) external returns(bool);
    function getBool(string calldata varName) external view returns (bool);
    function getUint256(string calldata varName) external view returns (uint256);
    function setUint256(string calldata varName, uint256 val) external returns(uint256);
    function getAddress(string calldata varName) external view returns (address);
    function setAddress(string calldata varName, address val) external returns (address);
}

interface IERC20 {
    function name() external view returns (string memory);
    function symbol() external view returns (string memory);
}

File 2 of 7: Address.sol
  
// SPDX-License-Identifier: MIT

pragma solidity ^0.6.2;

library Address {

    function isContract(address account) internal view returns (bool) {
        bytes32 codehash;
        bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
        assembly { codehash := extcodehash(account) }
        return (codehash != accountHash && codehash != 0x0);
    }

    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        (bool success, ) = recipient.call{ value: amount }("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
      return functionCall(target, data, "Address: low-level call failed");
    }

    function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        return _functionCallWithValue(target, data, 0, errorMessage);
    }

    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        return _functionCallWithValue(target, data, value, errorMessage);
    }

    function _functionCallWithValue(address target, bytes memory data, uint256 weiValue, string memory errorMessage) private returns (bytes memory) {
        require(isContract(target), "Address: call to non-contract");
        (bool success, bytes memory returndata) = target.call{ value: weiValue }(data);
        if (success) {
            return returndata;
        } else {
            if (returndata.length > 0) {
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

File 3 of 7: Context.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with GSN meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address payable) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

File 4 of 7: EnumerableMap.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

library EnumerableMap {

    struct MapEntry {
        bytes32 _key;
        bytes32 _value;
    }

    struct Map {
        MapEntry[] _entries;
        mapping (bytes32 => uint256) _indexes;
    }

    function _set(Map storage map, bytes32 key, bytes32 value) private returns (bool) {
        uint256 keyIndex = map._indexes[key];

        if (keyIndex == 0) {
            map._entries.push(MapEntry({ _key: key, _value: value }));
            map._indexes[key] = map._entries.length;
            return true;
        } else {
            map._entries[keyIndex - 1]._value = value;
            return false;
        }
    }

    function _remove(Map storage map, bytes32 key) private returns (bool) {
        uint256 keyIndex = map._indexes[key];

        if (keyIndex != 0) {

            uint256 toDeleteIndex = keyIndex - 1;
            uint256 lastIndex = map._entries.length - 1;

            MapEntry storage lastEntry = map._entries[lastIndex];

            map._entries[toDeleteIndex] = lastEntry;
            map._indexes[lastEntry._key] = toDeleteIndex + 1;
            map._entries.pop();
            delete map._indexes[key];

            return true;
        } else {
            return false;
        }
    }

    function _contains(Map storage map, bytes32 key) private view returns (bool) {
        return map._indexes[key] != 0;
    }

    function _length(Map storage map) private view returns (uint256) {
        return map._entries.length;
    }

    function _at(Map storage map, uint256 index) private view returns (bytes32, bytes32) {
        require(map._entries.length > index, "EnumerableMap: index out of bounds");

        MapEntry storage entry = map._entries[index];
        return (entry._key, entry._value);
    }

    function _get(Map storage map, bytes32 key) private view returns (bytes32) {
        return _get(map, key, "EnumerableMap: nonexistent key");
    }

    function _get(Map storage map, bytes32 key, string memory errorMessage) private view returns (bytes32) {
        uint256 keyIndex = map._indexes[key];
        require(keyIndex != 0, errorMessage); // Equivalent to contains(map, key)
        return map._entries[keyIndex - 1]._value; // All indexes are 1-based
    }

    struct UintToAddressMap {
        Map _inner;
    }

    function set(UintToAddressMap storage map, uint256 key, address value) internal returns (bool) {
        return _set(map._inner, bytes32(key), bytes32(uint256(value)));
    }

    function remove(UintToAddressMap storage map, uint256 key) internal returns (bool) {
        return _remove(map._inner, bytes32(key));
    }

    function contains(UintToAddressMap storage map, uint256 key) internal view returns (bool) {
        return _contains(map._inner, bytes32(key));
    }

    function length(UintToAddressMap storage map) internal view returns (uint256) {
        return _length(map._inner);
    }

    function at(UintToAddressMap storage map, uint256 index) internal view returns (uint256, address) {
        (bytes32 key, bytes32 value) = _at(map._inner, index);
        return (uint256(key), address(uint256(value)));
    }

    function get(UintToAddressMap storage map, uint256 key) internal view returns (address) {
        return address(uint256(_get(map._inner, bytes32(key))));
    }

    function get(UintToAddressMap storage map, uint256 key, string memory errorMessage) internal view returns (address) {
        return address(uint256(_get(map._inner, bytes32(key), errorMessage)));
    }
}

File 5 of 7: EnumerableSet.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

library EnumerableSet {

    struct Set {
        bytes32[] _values;
        mapping (bytes32 => uint256) _indexes;
    }

    function _add(Set storage set, bytes32 value) private returns (bool) {
        if (!_contains(set, value)) {
            set._values.push(value);
            set._indexes[value] = set._values.length;
            return true;
        } else {
            return false;
        }
    }

    function _remove(Set storage set, bytes32 value) private returns (bool) {
        uint256 valueIndex = set._indexes[value];

        if (valueIndex != 0) {

            uint256 toDeleteIndex = valueIndex - 1;
            uint256 lastIndex = set._values.length - 1;

            bytes32 lastvalue = set._values[lastIndex];

            set._values[toDeleteIndex] = lastvalue;
            set._indexes[lastvalue] = toDeleteIndex + 1;
            set._values.pop();

            delete set._indexes[value];

            return true;
        } else {
            return false;
        }
    }

    function _contains(Set storage set, bytes32 value) private view returns (bool) {
        return set._indexes[value] != 0;
    }

    function _length(Set storage set) private view returns (uint256) {
        return set._values.length;
    }

    function _at(Set storage set, uint256 index) private view returns (bytes32) {
        require(set._values.length > index, "EnumerableSet: index out of bounds");
        return set._values[index];
    }

    struct AddressSet {
        Set _inner;
    }

    function add(AddressSet storage set, address value) internal returns (bool) {
        return _add(set._inner, bytes32(uint256(value)));
    }

    function remove(AddressSet storage set, address value) internal returns (bool) {
        return _remove(set._inner, bytes32(uint256(value)));
    }

    function contains(AddressSet storage set, address value) internal view returns (bool) {
        return _contains(set._inner, bytes32(uint256(value)));
    }

    function length(AddressSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

    function at(AddressSet storage set, uint256 index) internal view returns (address) {
        return address(uint256(_at(set._inner, index)));
    }

    struct UintSet {
        Set _inner;
    }

    function add(UintSet storage set, uint256 value) internal returns (bool) {
        return _add(set._inner, bytes32(value));
    }

    function remove(UintSet storage set, uint256 value) internal returns (bool) {
        return _remove(set._inner, bytes32(value));
    }

    function contains(UintSet storage set, uint256 value) internal view returns (bool) {
        return _contains(set._inner, bytes32(value));
    }

    function length(UintSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

    function at(UintSet storage set, uint256 index) internal view returns (uint256) {
        return uint256(_at(set._inner, index));
    }
}

File 6 of 7: SafeMath.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

library SafeMath {

    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;

        return c;
    }

    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }

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

        return c;
    }

    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }

    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        uint256 c = a / b;
        return c;
    }

    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

File 7 of 7: Strings.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

library Strings {

    function toString(uint256 value) internal pure returns (string memory) {

        if (value == 0) {
            return "0";
        }
        uint256 temp = value;
        uint256 digits;
        while (temp != 0) {
            digits++;
            temp /= 10;
        }
        bytes memory buffer = new bytes(digits);
        uint256 index = digits - 1;
        temp = value;
        while (temp != 0) {
            buffer[index--] = byte(uint8(48 + temp % 10));
            temp /= 10;
        }
        return string(buffer);
    }
}

Contract Security Audit

Contract ABI

[{"inputs":[{"internalType":"string","name":"name","type":"string"},{"internalType":"string","name":"symbol","type":"string"},{"internalType":"address","name":"proxy","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"approved","type":"address"},{"indexed":true,"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"operator","type":"address"},{"indexed":false,"internalType":"bool","name":"approved","type":"bool"}],"name":"ApprovalForAll","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"tokenId","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"chainSize","type":"uint256"}],"name":"Finalized","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":true,"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"Transfer","type":"event"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"},{"internalType":"bytes","name":"_data","type":"bytes"}],"name":"_checkOnERC721Received","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"approve","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"baseURI","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"},{"internalType":"uint256","name":"position","type":"uint256"}],"name":"content","outputs":[{"internalType":"bytes","name":"","type":"bytes"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"getApproved","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getProxy","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"operator","type":"address"}],"name":"isApprovedForAll","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"metadata","outputs":[{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes","name":"payload","type":"bytes"},{"internalType":"string","name":"tokenURI","type":"string"},{"internalType":"uint256","name":"tokenId","type":"uint256"},{"internalType":"bool","name":"finalize","type":"bool"},{"internalType":"bytes","name":"data","type":"bytes"}],"name":"mint","outputs":[{"internalType":"uint256","name":"newTokenId","type":"uint256"}],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"ownerOf","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"safeTransferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"},{"internalType":"bytes","name":"_data","type":"bytes"}],"name":"safeTransferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"operator","type":"address"},{"internalType":"bool","name":"approved","type":"bool"}],"name":"setApprovalForAll","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"proxy","type":"address"}],"name":"setProxy","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes4","name":"interfaceId","type":"bytes4"}],"name":"supportsInterface","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"index","type":"uint256"}],"name":"tokenByIndex","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"uint256","name":"index","type":"uint256"}],"name":"tokenOfOwnerByIndex","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"tokenURI","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"transferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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

000000000000000000000000000000000000000000000000000000000000006000000000000000000000000000000000000000000000000000000000000000a00000000000000000000000004a08d087817fa803ef3e0b4e17d7856692f5d68d0000000000000000000000000000000000000000000000000000000000000006657468417274000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000044554524100000000000000000000000000000000000000000000000000000000

-----Decoded View---------------
Arg [0] : name (string): ethArt
Arg [1] : symbol (string): ETRA
Arg [2] : proxy (address): 0x4A08d087817Fa803ef3E0B4E17D7856692F5d68D

-----Encoded View---------------
7 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000060
Arg [1] : 00000000000000000000000000000000000000000000000000000000000000a0
Arg [2] : 0000000000000000000000004a08d087817fa803ef3e0b4e17d7856692f5d68d
Arg [3] : 0000000000000000000000000000000000000000000000000000000000000006
Arg [4] : 6574684172740000000000000000000000000000000000000000000000000000
Arg [5] : 0000000000000000000000000000000000000000000000000000000000000004
Arg [6] : 4554524100000000000000000000000000000000000000000000000000000000


Deployed Bytecode Sourcemap

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Swarm Source

ipfs://c9783587d7b3769496b817fb61b41d3c04bd1db4c22165b1c7cc0564f11aebb2

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.