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Latest 25 from a total of 71 transactions
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Set Approval For... | 16293052 | 506 days ago | IN | 0 ETH | 0.0008261 | ||||
Set Approval For... | 14974877 | 702 days ago | IN | 0 ETH | 0.0017708 | ||||
Transfer From | 13743501 | 896 days ago | IN | 0 ETH | 0.00501376 | ||||
Set Approval For... | 13197781 | 981 days ago | IN | 0 ETH | 0.00357786 | ||||
Set Approval For... | 12235061 | 1131 days ago | IN | 0 ETH | 0.00436965 | ||||
Set Approval For... | 12063871 | 1157 days ago | IN | 0 ETH | 0.00991056 | ||||
Set Approval For... | 9701344 | 1521 days ago | IN | 0 ETH | 0.0002714 | ||||
Set Approval For... | 9701344 | 1521 days ago | IN | 0 ETH | 0.0002714 | ||||
Set Approval For... | 9701344 | 1521 days ago | IN | 0 ETH | 0.000473 | ||||
Set Approval For... | 7703518 | 1840 days ago | IN | 0 ETH | 0.00004574 | ||||
Set Approval For... | 7696475 | 1841 days ago | IN | 0 ETH | 0.00027448 | ||||
Set Approval For... | 7654907 | 1848 days ago | IN | 0 ETH | 0.00022874 | ||||
Set Approval For... | 7491767 | 1873 days ago | IN | 0 ETH | 0.00022874 | ||||
Transfer From | 7394139 | 1888 days ago | IN | 0 ETH | 0.00007232 | ||||
Set Approval For... | 7257496 | 1911 days ago | IN | 0 ETH | 0.00036547 | ||||
Mint With Token ... | 7220323 | 1920 days ago | IN | 0 ETH | 0.00076895 | ||||
Mint With Token ... | 7220318 | 1920 days ago | IN | 0 ETH | 0.00076895 | ||||
Mint With Token ... | 7220316 | 1920 days ago | IN | 0 ETH | 0.00076895 | ||||
Mint With Token ... | 7220309 | 1920 days ago | IN | 0 ETH | 0.00076895 | ||||
Mint With Token ... | 7220302 | 1920 days ago | IN | 0 ETH | 0.00076895 | ||||
Mint With Token ... | 7220299 | 1920 days ago | IN | 0 ETH | 0.00076895 | ||||
Mint With Token ... | 7220287 | 1920 days ago | IN | 0 ETH | 0.00076895 | ||||
Mint With Token ... | 7215174 | 1921 days ago | IN | 0 ETH | 0.00076895 | ||||
Mint With Token ... | 7215169 | 1921 days ago | IN | 0 ETH | 0.00076895 | ||||
Mint With Token ... | 7215162 | 1921 days ago | IN | 0 ETH | 0.00076895 |
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Contract Name:
TreasureHunt
Compiler Version
v0.4.24+commit.e67f0147
Optimization Enabled:
Yes with 200 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity)
/** *Submitted for verification at Etherscan.io on 2018-12-17 */ pragma solidity ^0.4.24; /** * @title IERC165 * @dev https://github.com/ethereum/EIPs/blob/master/EIPS/eip-165.md */ interface IERC165 { /** * @notice Query if a contract implements an interface * @param interfaceId The interface identifier, as specified in ERC-165 * @dev Interface identification is specified in ERC-165. This function * uses less than 30,000 gas. */ function supportsInterface(bytes4 interfaceId) external view returns (bool); } /** * @title Roles * @dev Library for managing addresses assigned to a Role. */ library Roles { struct Role { mapping (address => bool) bearer; } /** * @dev give an account access to this role */ function add(Role storage role, address account) internal { require(account != address(0)); require(!has(role, account)); role.bearer[account] = true; } /** * @dev remove an account's access to this role */ function remove(Role storage role, address account) internal { require(account != address(0)); require(has(role, account)); role.bearer[account] = false; } /** * @dev check if an account has this role * @return bool */ function has(Role storage role, address account) internal view returns (bool) { require(account != address(0)); return role.bearer[account]; } } /** * @title ERC165 * @author Matt Condon (@shrugs) * @dev Implements ERC165 using a lookup table. */ contract ERC165 is IERC165 { bytes4 private constant _InterfaceId_ERC165 = 0x01ffc9a7; /** * 0x01ffc9a7 === * bytes4(keccak256('supportsInterface(bytes4)')) */ /** * @dev a mapping of interface id to whether or not it's supported */ mapping(bytes4 => bool) private _supportedInterfaces; /** * @dev A contract implementing SupportsInterfaceWithLookup * implement ERC165 itself */ constructor() internal { _registerInterface(_InterfaceId_ERC165); } /** * @dev implement supportsInterface(bytes4) using a lookup table */ function supportsInterface(bytes4 interfaceId) external view returns (bool) { return _supportedInterfaces[interfaceId]; } /** * @dev internal method for registering an interface */ function _registerInterface(bytes4 interfaceId) internal { require(interfaceId != 0xffffffff); _supportedInterfaces[interfaceId] = true; } } contract MinterRole { using Roles for Roles.Role; event MinterAdded(address indexed account); event MinterRemoved(address indexed account); Roles.Role private minters; constructor() internal { _addMinter(msg.sender); } modifier onlyMinter() { require(isMinter(msg.sender)); _; } function isMinter(address account) public view returns (bool) { return minters.has(account); } function addMinter(address account) public onlyMinter { _addMinter(account); } function renounceMinter() public { _removeMinter(msg.sender); } function _addMinter(address account) internal { minters.add(account); emit MinterAdded(account); } function _removeMinter(address account) internal { minters.remove(account); emit MinterRemoved(account); } } /** * @title ERC721 Non-Fungible Token Standard basic interface * @dev see https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md */ contract IERC721 is IERC165 { 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) public view returns (uint256 balance); function ownerOf(uint256 tokenId) public view returns (address owner); function approve(address to, uint256 tokenId) public; function getApproved(uint256 tokenId) public view returns (address operator); function setApprovalForAll(address operator, bool _approved) public; function isApprovedForAll(address owner, address operator) public view returns (bool); function transferFrom(address from, address to, uint256 tokenId) public; function safeTransferFrom(address from, address to, uint256 tokenId) public; function safeTransferFrom( address from, address to, uint256 tokenId, bytes data ) public; } /** * @title ERC721 token receiver interface * @dev Interface for any contract that wants to support safeTransfers * from ERC721 asset contracts. */ contract IERC721Receiver { /** * @notice Handle the receipt of an NFT * @dev The ERC721 smart contract calls this function on the recipient * after a `safeTransfer`. This function MUST return the function selector, * otherwise the caller will revert the transaction. The selector to be * returned can be obtained as `this.onERC721Received.selector`. This * function MAY throw to revert and reject the transfer. * Note: the ERC721 contract address is always the message sender. * @param operator The address which called `safeTransferFrom` function * @param from The address which previously owned the token * @param tokenId The NFT identifier which is being transferred * @param data Additional data with no specified format * @return `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))` */ function onERC721Received( address operator, address from, uint256 tokenId, bytes data ) public returns(bytes4); } /** * @title SafeMath * @dev Math operations with safety checks that revert on error */ library SafeMath { /** * @dev Multiplies two numbers, reverts on overflow. */ function mul(uint256 a, uint256 b) internal pure returns (uint256) { // Gas optimization: this is cheaper than requiring 'a' not being zero, but the // benefit is lost if 'b' is also tested. // See: https://github.com/OpenZeppelin/openzeppelin-solidity/pull/522 if (a == 0) { return 0; } uint256 c = a * b; require(c / a == b); return c; } /** * @dev Integer division of two numbers truncating the quotient, reverts on division by zero. */ function div(uint256 a, uint256 b) internal pure returns (uint256) { require(b > 0); // Solidity only automatically asserts 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 Subtracts two numbers, reverts on overflow (i.e. if subtrahend is greater than minuend). */ function sub(uint256 a, uint256 b) internal pure returns (uint256) { require(b <= a); uint256 c = a - b; return c; } /** * @dev Adds two numbers, reverts on overflow. */ function add(uint256 a, uint256 b) internal pure returns (uint256) { uint256 c = a + b; require(c >= a); return c; } /** * @dev Divides two numbers and returns the remainder (unsigned integer modulo), * reverts when dividing by zero. */ function mod(uint256 a, uint256 b) internal pure returns (uint256) { require(b != 0); return a % b; } } /** * Utility library of inline functions on addresses */ library Address { /** * Returns whether the target address is a contract * @dev This function will return false if invoked during the constructor of a contract, * as the code is not actually created until after the constructor finishes. * @param account address of the account to check * @return whether the target address is a contract */ function isContract(address account) internal view returns (bool) { uint256 size; // XXX Currently there is no better way to check if there is a contract in an address // than to check the size of the code at that address. // See https://ethereum.stackexchange.com/a/14016/36603 // for more details about how this works. // TODO Check this again before the Serenity release, because all addresses will be // contracts then. // solium-disable-next-line security/no-inline-assembly assembly { size := extcodesize(account) } return size > 0; } } /** * @title ERC721 Non-Fungible Token Standard basic implementation * @dev see https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md */ contract ERC721 is ERC165, IERC721 { using SafeMath for uint256; using Address for address; // Equals to `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))` // which can be also obtained as `IERC721Receiver(0).onERC721Received.selector` bytes4 private constant _ERC721_RECEIVED = 0x150b7a02; // Mapping from token ID to owner mapping (uint256 => address) private _tokenOwner; // Mapping from token ID to approved address mapping (uint256 => address) private _tokenApprovals; // Mapping from owner to number of owned token mapping (address => uint256) private _ownedTokensCount; // Mapping from owner to operator approvals mapping (address => mapping (address => bool)) private _operatorApprovals; bytes4 private constant _InterfaceId_ERC721 = 0x80ac58cd; /* * 0x80ac58cd === * bytes4(keccak256('balanceOf(address)')) ^ * bytes4(keccak256('ownerOf(uint256)')) ^ * bytes4(keccak256('approve(address,uint256)')) ^ * bytes4(keccak256('getApproved(uint256)')) ^ * bytes4(keccak256('setApprovalForAll(address,bool)')) ^ * bytes4(keccak256('isApprovedForAll(address,address)')) ^ * bytes4(keccak256('transferFrom(address,address,uint256)')) ^ * bytes4(keccak256('safeTransferFrom(address,address,uint256)')) ^ * bytes4(keccak256('safeTransferFrom(address,address,uint256,bytes)')) */ constructor() public { // register the supported interfaces to conform to ERC721 via ERC165 _registerInterface(_InterfaceId_ERC721); } /** * @dev Gets the balance of the specified address * @param owner address to query the balance of * @return uint256 representing the amount owned by the passed address */ function balanceOf(address owner) public view returns (uint256) { require(owner != address(0)); return _ownedTokensCount[owner]; } /** * @dev Gets the owner of the specified token ID * @param tokenId uint256 ID of the token to query the owner of * @return owner address currently marked as the owner of the given token ID */ function ownerOf(uint256 tokenId) public view returns (address) { address owner = _tokenOwner[tokenId]; require(owner != address(0)); return owner; } /** * @dev Approves another address to transfer the given token ID * The zero address indicates there is no approved address. * There can only be one approved address per token at a given time. * Can only be called by the token owner or an approved operator. * @param to address to be approved for the given token ID * @param tokenId uint256 ID of the token to be approved */ function approve(address to, uint256 tokenId) public { address owner = ownerOf(tokenId); require(to != owner); require(msg.sender == owner || isApprovedForAll(owner, msg.sender)); _tokenApprovals[tokenId] = to; emit Approval(owner, to, tokenId); } /** * @dev Gets the approved address for a token ID, or zero if no address set * Reverts if the token ID does not exist. * @param tokenId uint256 ID of the token to query the approval of * @return address currently approved for the given token ID */ function getApproved(uint256 tokenId) public view returns (address) { require(_exists(tokenId)); return _tokenApprovals[tokenId]; } /** * @dev Sets or unsets the approval of a given operator * An operator is allowed to transfer all tokens of the sender on their behalf * @param to operator address to set the approval * @param approved representing the status of the approval to be set */ function setApprovalForAll(address to, bool approved) public { require(to != msg.sender); _operatorApprovals[msg.sender][to] = approved; emit ApprovalForAll(msg.sender, to, approved); } /** * @dev Tells whether an operator is approved by a given owner * @param owner owner address which you want to query the approval of * @param operator operator address which you want to query the approval of * @return bool whether the given operator is approved by the given owner */ function isApprovedForAll( address owner, address operator ) public view returns (bool) { return _operatorApprovals[owner][operator]; } /** * @dev Transfers the ownership of a given token ID to another address * Usage of this method is discouraged, use `safeTransferFrom` whenever possible * Requires the msg sender to be the owner, approved, or operator * @param from current owner of the token * @param to address to receive the ownership of the given token ID * @param tokenId uint256 ID of the token to be transferred */ function transferFrom( address from, address to, uint256 tokenId ) public { require(_isApprovedOrOwner(msg.sender, tokenId)); require(to != address(0)); _clearApproval(from, tokenId); _removeTokenFrom(from, tokenId); _addTokenTo(to, tokenId); emit Transfer(from, to, tokenId); } /** * @dev Safely transfers the ownership of a given token ID to another address * If the target address is a contract, it must implement `onERC721Received`, * which is called upon a safe transfer, and return the magic value * `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`; otherwise, * the transfer is reverted. * * Requires the msg sender to be the owner, approved, or operator * @param from current owner of the token * @param to address to receive the ownership of the given token ID * @param tokenId uint256 ID of the token to be transferred */ function safeTransferFrom( address from, address to, uint256 tokenId ) public { // solium-disable-next-line arg-overflow safeTransferFrom(from, to, tokenId, ""); } /** * @dev Safely transfers the ownership of a given token ID to another address * If the target address is a contract, it must implement `onERC721Received`, * which is called upon a safe transfer, and return the magic value * `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`; otherwise, * the transfer is reverted. * Requires the msg sender to be the owner, approved, or operator * @param from current owner of the token * @param to address to receive the ownership of the given token ID * @param tokenId uint256 ID of the token to be transferred * @param _data bytes data to send along with a safe transfer check */ function safeTransferFrom( address from, address to, uint256 tokenId, bytes _data ) public { transferFrom(from, to, tokenId); // solium-disable-next-line arg-overflow require(_checkOnERC721Received(from, to, tokenId, _data)); } /** * @dev Returns whether the specified token exists * @param tokenId uint256 ID of the token to query the existence of * @return whether the token exists */ function _exists(uint256 tokenId) internal view returns (bool) { address owner = _tokenOwner[tokenId]; return owner != address(0); } /** * @dev Returns whether the given spender can transfer a given token ID * @param spender address of the spender to query * @param tokenId uint256 ID of the token to be transferred * @return bool whether the msg.sender is approved for the given token ID, * is an operator of the owner, or is the owner of the token */ function _isApprovedOrOwner( address spender, uint256 tokenId ) internal view returns (bool) { address owner = ownerOf(tokenId); // Disable solium check because of // https://github.com/duaraghav8/Solium/issues/175 // solium-disable-next-line operator-whitespace return ( spender == owner || getApproved(tokenId) == spender || isApprovedForAll(owner, spender) ); } /** * @dev Internal function to mint a new token * Reverts if the given token ID already exists * @param to The address that will own the minted token * @param tokenId uint256 ID of the token to be minted by the msg.sender */ function _mint(address to, uint256 tokenId) internal { require(to != address(0)); _addTokenTo(to, tokenId); emit Transfer(address(0), to, tokenId); } /** * @dev Internal function to burn a specific token * Reverts if the token does not exist * @param tokenId uint256 ID of the token being burned by the msg.sender */ function _burn(address owner, uint256 tokenId) internal { _clearApproval(owner, tokenId); _removeTokenFrom(owner, tokenId); emit Transfer(owner, address(0), tokenId); } /** * @dev Internal function to add a token ID to the list of a given address * Note that this function is left internal to make ERC721Enumerable possible, but is not * intended to be called by custom derived contracts: in particular, it emits no Transfer event. * @param to address representing the new owner of the given token ID * @param tokenId uint256 ID of the token to be added to the tokens list of the given address */ function _addTokenTo(address to, uint256 tokenId) internal { require(_tokenOwner[tokenId] == address(0)); _tokenOwner[tokenId] = to; _ownedTokensCount[to] = _ownedTokensCount[to].add(1); } /** * @dev Internal function to remove a token ID from the list of a given address * Note that this function is left internal to make ERC721Enumerable possible, but is not * intended to be called by custom derived contracts: in particular, it emits no Transfer event, * and doesn't clear approvals. * @param from address representing the previous owner of the given token ID * @param tokenId uint256 ID of the token to be removed from the tokens list of the given address */ function _removeTokenFrom(address from, uint256 tokenId) internal { require(ownerOf(tokenId) == from); _ownedTokensCount[from] = _ownedTokensCount[from].sub(1); _tokenOwner[tokenId] = address(0); } /** * @dev Internal function to invoke `onERC721Received` on a target address * The call is not executed if the target address is not a contract * @param from address representing the previous owner of the given token ID * @param to target address that will receive the tokens * @param tokenId uint256 ID of the token to be transferred * @param _data bytes optional data to send along with the call * @return whether the call correctly returned the expected magic value */ function _checkOnERC721Received( address from, address to, uint256 tokenId, bytes _data ) internal returns (bool) { if (!to.isContract()) { return true; } bytes4 retval = IERC721Receiver(to).onERC721Received( msg.sender, from, tokenId, _data); return (retval == _ERC721_RECEIVED); } /** * @dev Private function to clear current approval of a given token ID * Reverts if the given address is not indeed the owner of the token * @param owner owner of the token * @param tokenId uint256 ID of the token to be transferred */ function _clearApproval(address owner, uint256 tokenId) private { require(ownerOf(tokenId) == owner); if (_tokenApprovals[tokenId] != address(0)) { _tokenApprovals[tokenId] = address(0); } } } /** * @title ERC-721 Non-Fungible Token Standard, optional metadata extension * @dev See https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md */ contract IERC721Metadata is IERC721 { function name() external view returns (string); function symbol() external view returns (string); function tokenURI(uint256 tokenId) external view returns (string); } contract ERC721Metadata is ERC165, ERC721, IERC721Metadata { // Token name string private _name; // Token symbol string private _symbol; // Optional mapping for token URIs mapping(uint256 => string) private _tokenURIs; bytes4 private constant InterfaceId_ERC721Metadata = 0x5b5e139f; /** * 0x5b5e139f === * bytes4(keccak256('name()')) ^ * bytes4(keccak256('symbol()')) ^ * bytes4(keccak256('tokenURI(uint256)')) */ /** * @dev Constructor function */ constructor(string name, string symbol) public { _name = name; _symbol = symbol; // register the supported interfaces to conform to ERC721 via ERC165 _registerInterface(InterfaceId_ERC721Metadata); } /** * @dev Gets the token name * @return string representing the token name */ function name() external view returns (string) { return _name; } /** * @dev Gets the token symbol * @return string representing the token symbol */ function symbol() external view returns (string) { return _symbol; } /** * @dev Returns an URI for a given token ID * Throws if the token ID does not exist. May return an empty string. * @param tokenId uint256 ID of the token to query */ function tokenURI(uint256 tokenId) external view returns (string) { require(_exists(tokenId)); return _tokenURIs[tokenId]; } /** * @dev Internal function to set the token URI for a given token * Reverts if the token ID does not exist * @param tokenId uint256 ID of the token to set its URI * @param uri string URI to assign */ function _setTokenURI(uint256 tokenId, string uri) internal { require(_exists(tokenId)); _tokenURIs[tokenId] = uri; } /** * @dev Internal function to burn a specific token * Reverts if the token does not exist * @param owner owner of the token to burn * @param tokenId uint256 ID of the token being burned by the msg.sender */ function _burn(address owner, uint256 tokenId) internal { super._burn(owner, tokenId); // Clear metadata (if any) if (bytes(_tokenURIs[tokenId]).length != 0) { delete _tokenURIs[tokenId]; } } } /** * @title ERC721MetadataMintable * @dev ERC721 minting logic with metadata */ contract ERC721MetadataMintable is ERC721, ERC721Metadata, MinterRole { /** * @dev Function to mint tokens * @param to The address that will receive the minted tokens. * @param tokenId The token id to mint. * @param tokenURI The token URI of the minted token. * @return A boolean that indicates if the operation was successful. */ function mintWithTokenURI( address to, uint256 tokenId, string tokenURI ) public onlyMinter returns (bool) { _mint(to, tokenId); _setTokenURI(tokenId, tokenURI); return true; } } contract TreasureHunt is ERC721Metadata("FOAM Treasure Hunt", "FTH"), ERC721MetadataMintable { constructor () public { } }
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Contract Creation Code
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Deployed Bytecode
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Swarm Source
bzzr://c79117ae4b71c96a0666dc3fcf7f4bec95fa931b2500ee225d4506f8a8f7c3c5
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Multichain Portfolio | 25 Chains
Chain | Token | Portfolio % | Price | Amount | Value |
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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.