ERC-20
Overview
Max Total Supply
115 WordToken
Holders
1
Total Transfers
-
Market
Onchain Market Cap
$0.00
Circulating Supply Market Cap
-
Other Info
Token Contract (WITH 0 Decimals)
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# | Exchange | Pair | Price | 24H Volume | % Volume |
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Contract Name:
EtherWords
Compiler Version
v0.4.19+commit.c4cbbb05
Optimization Enabled:
Yes with 200 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity)
/** *Submitted for verification at Etherscan.io on 2018-02-03 */ pragma solidity ^0.4.18; // solhint-disable-line /// @title Interface for contracts conforming to ERC-721: Non-Fungible Tokens /// @author Dieter Shirley <[email protected]> (https://github.com/dete) contract ERC721 { // Required methods function approve(address _to, uint256 _tokenId) public; function balanceOf(address _owner) public view returns (uint256 balance); function implementsERC721() public pure returns (bool); function ownerOf(uint256 _tokenId) public view returns (address addr); function takeOwnership(uint256 _tokenId) public; function totalSupply() public view returns (uint256 total); function transferFrom(address _from, address _to, uint256 _tokenId) public; function transfer(address _to, uint256 _tokenId) public; event Transfer(address indexed from, address indexed to, uint256 tokenId); event Approval(address indexed owner, address indexed approved, uint256 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 EtherWords is ERC721 { /*** EVENTS ***/ /// @dev The Birth event is fired whenever a new Number comes into existence. event Birth(uint256 tokenId, string name, address owner); /// @dev The TokenSold event is fired whenever a token is sold. event TokenSold(uint256 tokenId, uint256 oldPrice, uint256 newPrice, address prevOwner, address winner, string name); /// @dev Transfer event as defined in current draft of ERC721. /// ownership is assigned, including births. event Transfer(address from, address to, uint256 tokenId); /*** CONSTANTS ***/ /// @notice Name and symbol of the non fungible token, as defined in ERC721. string public constant NAME = "EtherWords"; // solhint-disable-line string public constant SYMBOL = "WordToken"; // solhint-disable-line uint256 private startingPrice = 0.001 ether; uint256 private constant PROMO_CREATION_LIMIT = 10000; uint256 private firstStepLimit = 0.053613 ether; uint256 private secondStepLimit = 0.564957 ether; uint256 private cooPrice = 50.0 ether; /*** STORAGE ***/ /// @dev A mapping from person IDs to the address that owns them. All persons have /// some valid owner address. mapping (uint256 => address) public personIndexToOwner; // @dev A mapping from owner address to count of tokens that address owns. // Used internally inside balanceOf() to resolve ownership count. mapping (address => uint256) private ownershipTokenCount; /// @dev A mapping from PersonIDs to an address that has been approved to call /// transferFrom(). Each Person can only have one approved address for transfer /// at any time. A zero value means no approval is outstanding. mapping (uint256 => address) public personIndexToApproved; // @dev A mapping from PersonIDs to the price of the token. mapping (uint256 => uint256) private personIndexToPrice; // The addresses of the accounts (or contracts) that can execute actions within each roles. address public ceoAddress; address public cooAddress; uint256 public promoCreatedCount; /*** DATATYPES ***/ struct Number { string name; } Number[] private numbers; /*** ACCESS MODIFIERS ***/ /// @dev Access modifier for CEO-only functionality modifier onlyCEO() { require(msg.sender == ceoAddress); _; } /// @dev Access modifier for COO-only functionality modifier onlyCOO() { require(msg.sender == cooAddress); _; } /// Access modifier for contract owner only functionality modifier onlyCLevel() { require( msg.sender == ceoAddress || msg.sender == cooAddress ); _; } /*** CONSTRUCTOR ***/ function EtherWords() public { ceoAddress = msg.sender; cooAddress = msg.sender; } /*** PUBLIC FUNCTIONS ***/ /// @notice Grant another address the right to transfer token via takeOwnership() and transferFrom(). /// @param _to The address to be granted transfer approval. Pass address(0) to /// clear all approvals. /// @param _tokenId The ID of the Token that can be transferred if this call succeeds. /// @dev Required for ERC-721 compliance. function approve( address _to, uint256 _tokenId ) public { // Caller must own token. require(_owns(msg.sender, _tokenId)); personIndexToApproved[_tokenId] = _to; Approval(msg.sender, _to, _tokenId); } /// For querying balance of a particular account /// @param _owner The address for balance query /// @dev Required for ERC-721 compliance. function balanceOf(address _owner) public view returns (uint256 balance) { return ownershipTokenCount[_owner]; } /// @dev Creates a new promo Person with the given name, with given _price and assignes it to an address. function createPromoNumber(address _owner, string _name, uint256 _price) public onlyCOO { require(promoCreatedCount < PROMO_CREATION_LIMIT); address personOwner = _owner; if (personOwner == address(0)) { personOwner = cooAddress; } if (_price <= 0) { _price = startingPrice; } promoCreatedCount++; _createPerson(_name, personOwner, _price); } /// @dev Creates a new Person with the given name. function createContractNumber(string _name) public onlyCLevel { _createPerson(_name, address(this), startingPrice); } /// @notice Returns all the relevant information about a specific person. /// @param _tokenId The tokenId of the person of interest. function getNumber(uint256 _tokenId) public view returns ( string numberName, uint256 sellingPrice, address owner ) { Number storage number = numbers[_tokenId]; numberName = number.name; sellingPrice = personIndexToPrice[_tokenId]; owner = personIndexToOwner[_tokenId]; } function implementsERC721() public pure returns (bool) { return true; } /// @dev Required for ERC-721 compliance. function name() public pure returns (string) { return NAME; } /// For querying owner of token /// @param _tokenId The tokenID for owner inquiry /// @dev Required for ERC-721 compliance. function ownerOf(uint256 _tokenId) public view returns (address owner) { owner = personIndexToOwner[_tokenId]; require(owner != address(0)); } function payout(address _to) public onlyCLevel { _payout(_to); } // Allows someone to send ether and obtain the token function purchase(uint256 _tokenId) public payable { address oldOwner = personIndexToOwner[_tokenId]; address newOwner = msg.sender; // Making sure token owner is not sending to self require(oldOwner != newOwner); uint256 sellingPrice = personIndexToPrice[_tokenId]; // Safety check to prevent against an unexpected 0x0 default. require(_addressNotNull(newOwner)); // Making sure sent amount is greater than or equal to the sellingPrice require(msg.value >= sellingPrice); uint256 payment = uint256(SafeMath.div(SafeMath.mul(sellingPrice, 92), 100)); uint256 purchaseExcess = SafeMath.sub(msg.value, sellingPrice); // Update prices if (sellingPrice < firstStepLimit) { // first stage personIndexToPrice[_tokenId] = SafeMath.div(SafeMath.mul(sellingPrice, 200), 92); } else if (sellingPrice < secondStepLimit) { // second stage personIndexToPrice[_tokenId] = SafeMath.div(SafeMath.mul(sellingPrice, 120), 92); } else { // third stage personIndexToPrice[_tokenId] = SafeMath.div(SafeMath.mul(sellingPrice, 115), 92); } _transfer(oldOwner, newOwner, _tokenId); // Pay previous tokenOwner if owner is not contract if (oldOwner != address(this)) { oldOwner.transfer(payment); //(1-0.08) } TokenSold(_tokenId, sellingPrice, personIndexToPrice[_tokenId], oldOwner, newOwner, numbers[_tokenId].name); msg.sender.transfer(purchaseExcess); personIndexToPrice[0] = SafeMath.div(SafeMath.mul(personIndexToPrice[0], 101), 100); if (_tokenId == 0) { cooAddress = msg.sender; personIndexToPrice[0] = SafeMath.div(SafeMath.mul(personIndexToPrice[0], 110), 100); } } function priceOf(uint256 _tokenId) public view returns (uint256 price) { return personIndexToPrice[_tokenId]; } /// @dev Assigns a new address to act as the CEO. Only available to the current CEO. /// @param _newCEO The address of the new CEO function setCEO(address _newCEO) public onlyCEO { require(_newCEO != address(0)); ceoAddress = _newCEO; } /// @dev Assigns a new address to act as the COO. Only available to the current COO. /// @param _newCOO The address of the new COO function setCOO(address _newCOO) public onlyCEO { require(_newCOO != address(0)); cooAddress = _newCOO; } /// @dev creates the genesis word. function genesisCreation() public onlyCEO { if (numbers.length == 0) { _createPerson("EtherWords", address(this), cooPrice); } } /// @dev Required for ERC-721 compliance. function symbol() public pure returns (string) { return SYMBOL; } /// @notice Allow pre-approved user to take ownership of a token /// @param _tokenId The ID of the Token that can be transferred if this call succeeds. /// @dev Required for ERC-721 compliance. function takeOwnership(uint256 _tokenId) public { address newOwner = msg.sender; address oldOwner = personIndexToOwner[_tokenId]; // Safety check to prevent against an unexpected 0x0 default. require(_addressNotNull(newOwner)); // Making sure transfer is approved require(_approved(newOwner, _tokenId)); _transfer(oldOwner, newOwner, _tokenId); } /// @param _owner The owner whose celebrity tokens we are interested in. /// @dev This method MUST NEVER be called by smart contract code. First, it's fairly /// expensive (it walks the entire Persons array looking for persons belonging to owner), /// but it also returns a dynamic array, which is only supported for web3 calls, and /// not contract-to-contract calls. function tokensOfOwner(address _owner) public view returns(uint256[] ownerTokens) { uint256 tokenCount = balanceOf(_owner); if (tokenCount == 0) { // Return an empty array return new uint256[](0); } else { uint256[] memory result = new uint256[](tokenCount); uint256 totalPersons = totalSupply(); uint256 resultIndex = 0; uint256 personId; for (personId = 0; personId <= totalPersons; personId++) { if (personIndexToOwner[personId] == _owner) { result[resultIndex] = personId; resultIndex++; } } return result; } } /// For querying totalSupply of token /// @dev Required for ERC-721 compliance. function totalSupply() public view returns (uint256 total) { return numbers.length; } /// Owner initates the transfer of the token to another account /// @param _to The address for the token to be transferred to. /// @param _tokenId The ID of the Token that can be transferred if this call succeeds. /// @dev Required for ERC-721 compliance. function transfer( address _to, uint256 _tokenId ) public { require(_owns(msg.sender, _tokenId)); require(_addressNotNull(_to)); _transfer(msg.sender, _to, _tokenId); } /// Third-party initiates transfer of token from address _from to address _to /// @param _from The address for the token to be transferred from. /// @param _to The address for the token to be transferred to. /// @param _tokenId The ID of the Token that can be transferred if this call succeeds. /// @dev Required for ERC-721 compliance. function transferFrom( address _from, address _to, uint256 _tokenId ) public { require(_owns(_from, _tokenId)); require(_approved(_to, _tokenId)); require(_addressNotNull(_to)); _transfer(_from, _to, _tokenId); } /*** PRIVATE FUNCTIONS ***/ /// Safety check on _to address to prevent against an unexpected 0x0 default. function _addressNotNull(address _to) private pure returns (bool) { return _to != address(0); } /// For checking approval of transfer for address _to function _approved(address _to, uint256 _tokenId) private view returns (bool) { return personIndexToApproved[_tokenId] == _to; } /// For creating Person function _createPerson(string _name, address _owner, uint256 _price) private { Number memory _number = Number({ name: _name }); uint256 newPersonId = numbers.push(_number) - 1; // It's probably never going to happen, 4 billion tokens are A LOT, but // let's just be 100% sure we never let this happen. require(newPersonId == uint256(uint32(newPersonId))); Birth(newPersonId, _name, _owner); personIndexToPrice[newPersonId] = _price; // This will assign ownership, and also emit the Transfer event as // per ERC721 draft _transfer(address(0), _owner, newPersonId); } /// Check for token ownership function _owns(address claimant, uint256 _tokenId) private view returns (bool) { return claimant == personIndexToOwner[_tokenId]; } /// For paying out balance on contract function _payout(address _to) private { if (_to == address(0)) { ceoAddress.transfer(this.balance); } else { _to.transfer(this.balance); } } /// @dev Assigns ownership of a specific Person to an address. function _transfer(address _from, address _to, uint256 _tokenId) private { // Since the number of persons is capped to 2^32 we can't overflow this ownershipTokenCount[_to]++; //transfer ownership personIndexToOwner[_tokenId] = _to; // When creating new persons _from is 0x0, but we can't account that address. if (_from != address(0)) { ownershipTokenCount[_from]--; // clear any previously approved ownership exchange delete personIndexToApproved[_tokenId]; } // Emit the transfer event. Transfer(_from, _to, _tokenId); } } library SafeMath { /** * @dev Multiplies two numbers, throws on overflow. */ function mul(uint256 a, uint256 b) internal pure returns (uint256) { if (a == 0) { return 0; } uint256 c = a * b; assert(c / a == b); return c; } /** * @dev Integer division of two numbers, truncating the quotient. */ function div(uint256 a, uint256 b) internal pure returns (uint256) { // assert(b > 0); // Solidity automatically throws 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 Substracts two numbers, throws on overflow (i.e. if subtrahend is greater than minuend). */ function sub(uint256 a, uint256 b) internal pure returns (uint256) { assert(b <= a); return a - b; } /** * @dev Adds two numbers, throws on overflow. */ function add(uint256 a, uint256 b) internal pure returns (uint256) { uint256 c = a + b; assert(c >= a); return c; } }
Contract Security Audit
- No Contract Security Audit Submitted- Submit Audit Here
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Contract Creation Code
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Swarm Source
bzzr://c089310414c8c4b5334f7c33dd91f9f4e2c70b1af6501f547b066c38053ddd25
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