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Contract Overview
Balance: 5.2437 Ether
Ether Value: $884.61 (@ $168.70/ETH)
Transactions: 1070 txns
Token Tracker: HodlEarthToken (HEAR)
Misc:
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Contract Creator: 0x46315b02cf047f0bf2effe2350fd522dcfa9729bat txn 0x83013cbd0057f6552a4a79bfc3c3d2797446d179ca0cb520c0772bddc8fd3ada
 Latest 25 transactions from a total of 1070 transactions

TxHash Age From To Value [TxFee]
0xc253c7edbb985efeeac285f4bdad257ec32dbfdb943b0c40fcd39ae1ad9d21c239 days 13 hrs ago0x2164938ebd3039fdf9fbd97671cf59cc2c0d8801  IN   0x8a8ec4cedf933dc983724c235fd4f4754ffbe6fc0.0014 Ether0.00086543
0x5bebab0eee3b602bf2e84a09f46a3d9c3dfa3a601dabe4ec31dbf7dd24496d0a39 days 13 hrs ago0x20176651dc7a701af42849a2d56d892f9b2f04e7  IN   0x8a8ec4cedf933dc983724c235fd4f4754ffbe6fc0.0018 Ether0.00014999
0x659c97fdc7047b05d24d60d84988b113f41d0b67eceb8b2673f77dddab7234f839 days 13 hrs ago0x2164938ebd3039fdf9fbd97671cf59cc2c0d8801  IN   0x8a8ec4cedf933dc983724c235fd4f4754ffbe6fc0.0014 Ether0.00086543
0x3e482534b1fa25e9f9b3ced460ec14fc32ede2f97bfed335e2c73ac23c96a4c139 days 13 hrs ago0x20176651dc7a701af42849a2d56d892f9b2f04e7  IN   0x8a8ec4cedf933dc983724c235fd4f4754ffbe6fc0.0018 Ether0.001602335
0xdfe4c6169e046b6cb7cd9c079b83e9f0b3d620b4689cc77c7fd9f064b13b6c4f39 days 13 hrs ago0xc6195c5b1dfd0cc51ead18622193a0d956a865b2  IN   0x8a8ec4cedf933dc983724c235fd4f4754ffbe6fc0.0014 Ether0.00086543
0xf2dcad6ee501b95803330c1a3404cc47204780318da596da91982952b4a86c0039 days 13 hrs ago0x062ca5d5811b5af409c9fd2d282e8fed75021897  IN   0x8a8ec4cedf933dc983724c235fd4f4754ffbe6fc0.0014 Ether0.00086543
0xa08d33b44e9da778f8ca85e67a93923b27296454ec4857ae42c284d14a2dc87639 days 13 hrs ago0xe60dad88e6a026e30f4c08b8ddb67d33e07062a5  IN   0x8a8ec4cedf933dc983724c235fd4f4754ffbe6fc0.0014 Ether0.00086543
0xd9df0cb2602966917146ca7f7d1a168d8b63bdd1b70b37a449892049a8259b2439 days 13 hrs ago0x42d126cca3ca296c1dc0683eb7140ad1cf218d7b  IN   0x8a8ec4cedf933dc983724c235fd4f4754ffbe6fc0.0014 Ether0.00086543
0x0dd3ef84003e87103a5f58588e4b8ed80b7d7aabb1638eb680dc3d0d0c8bfaeb39 days 13 hrs ago0x4293e7b8c80e02da043d204723084528380055f3  IN   0x8a8ec4cedf933dc983724c235fd4f4754ffbe6fc0.0014 Ether0.00086543
0x9c57d9c7d27222f790621dbefbcacc0555f63c241030cb8a32388ded9ea0f13b39 days 13 hrs ago0x477f7f8a716e41ef0d00609b1a0d376d8fe07acf  IN   0x8a8ec4cedf933dc983724c235fd4f4754ffbe6fc0.0014 Ether0.001038516
0x85aa50b79a50da642fbbc06582e9910465a1033456c17475c0b43331cbb4e83639 days 13 hrs ago0xe60dad88e6a026e30f4c08b8ddb67d33e07062a5  IN   0x8a8ec4cedf933dc983724c235fd4f4754ffbe6fc0.0014 Ether0.00086543
0x86465e936231d987da09ea00b5a85a858d8495b58a1dbd62f2621e3eec73d14f39 days 13 hrs ago0x477f7f8a716e41ef0d00609b1a0d376d8fe07acf  IN   0x8a8ec4cedf933dc983724c235fd4f4754ffbe6fc0.0018 Ether0.001602335
0x5c2434811642927c1358b09afe703a0c779f1c6ef1b26bca17d3395e106ca53939 days 13 hrs ago0x538191af2e7f7613cbadcb7fe1a0c356fc295549  IN   0x8a8ec4cedf933dc983724c235fd4f4754ffbe6fc0.0014 Ether0.00086543
0xdeb90d3dc9364d7285b0c430ca6323681406b9b65e2cf5d0e6562bd0dabfbff039 days 13 hrs ago0xfac2eabca16dc094177766aee65e040d57bd56c7  IN   0x8a8ec4cedf933dc983724c235fd4f4754ffbe6fc0.0014 Ether0.00086543
0xf4444c7fbab3e5e364675d69dd755337313b79196098c1dd1dbdf6ad4bc98c7d39 days 13 hrs ago0x42d126cca3ca296c1dc0683eb7140ad1cf218d7b  IN   0x8a8ec4cedf933dc983724c235fd4f4754ffbe6fc0.0014 Ether0.00086543
0x36cb444c77e6fcde19dc6bb8442e553a546704a5dac45089dc75f85657d7ae6339 days 13 hrs ago0x4b3bee6a25ae90a8716b4916594753cf281a5225  IN   0x8a8ec4cedf933dc983724c235fd4f4754ffbe6fc0.0014 Ether0.001038516
0x440a77433410a7495a6d8853005626578af2a47c5b1aef73da1205378302c12c39 days 13 hrs ago0xcca5e43312bc6f5fbecadc30ff63f95f231cbcf2  IN   0x8a8ec4cedf933dc983724c235fd4f4754ffbe6fc0.0014 Ether0.001038516
0xf2253525fb19a986475933c1e03babf548d6503ef89502b05e8786d235dc223439 days 14 hrs ago0x17bafdd713ef00931d6fb2aff3e779cc9e6c8d25  IN   0x8a8ec4cedf933dc983724c235fd4f4754ffbe6fc0.0018 Ether0.001602335
0x1213e01ea374fadec11c3628a5dc32f8e5a4aa0d7f577a20743167a848ad683939 days 14 hrs ago0xc1c0a2adae89c8f7296b0b416049da9e15f58dc9  IN   0x8a8ec4cedf933dc983724c235fd4f4754ffbe6fc0.0014 Ether0.00086511
0xff21ad8c9e98c24fecee35bcec3890e53bb834670cb7f6f70601accca5f63e5239 days 14 hrs ago0x487d3ba4ce17f2b461d42b7f996e93120d7e8f98  IN   0x8a8ec4cedf933dc983724c235fd4f4754ffbe6fc0.0014 Ether0.00086543
0x895d9df653338cad38a305a6df9cdaa4d26c89b0b83a4d52ecd1aca38944920339 days 14 hrs ago0x487d3ba4ce17f2b461d42b7f996e93120d7e8f98  IN   0x8a8ec4cedf933dc983724c235fd4f4754ffbe6fc0.0014 Ether0.00086511
0x0d8d13fbc2171bfaa001aa7b825f975721e5087f00d2daedb824bde4ab76a84b39 days 14 hrs ago0x52918f64be1297b44d63481b3178a1795ea1eda4  IN   0x8a8ec4cedf933dc983724c235fd4f4754ffbe6fc0.0014 Ether0.00086543
0x19b475e43b0e3a62a067f80cbfbce02c043497abd612c550049a1dc21df78aec39 days 14 hrs ago0x0b7f8b965b95164f7111d6ab68543684bd9b4832  IN   0x8a8ec4cedf933dc983724c235fd4f4754ffbe6fc0.0014 Ether0.00086543
0x89de088aa7bf9de4d75f330cb6bfd1940487d52a5242931f27e36129c49fc96f39 days 14 hrs ago0xf76bbb9827c865ee961e6f20c15aeef0001a1ea4  IN   0x8a8ec4cedf933dc983724c235fd4f4754ffbe6fc0.0014 Ether0.001038516
0xf09b9e24606ba32aceac6d983ef679a6e6645bd7a88808dda303a950481ec3c439 days 14 hrs ago0xf76bbb9827c865ee961e6f20c15aeef0001a1ea4  IN   0x8a8ec4cedf933dc983724c235fd4f4754ffbe6fc0.0014 Ether0.001038516
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 Internal Transactions as a result of Contract Execution
 Latest 1 Internal Transaction

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0x681c0dc38347a7dadf89309a20282d037eef19c1718704461fafffd231e2a6d0624286580 days 7 hrs ago0x8a8ec4cedf933dc983724c235fd4f4754ffbe6fc0x46315b02cf047f0bf2effe2350fd522dcfa9729b0.0036 Ether
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Warning: The Compiled Contract might be susceptible to ExpExponentCleanup (medium/high-severity), EventStructWrongData (very low-severity) SolidityCompiler Bugs.

Contract Source Code Verified (Exact Match)
Contract Name: HodlEarthToken
Compiler Text: v0.4.24+commit.e67f0147
Optimization Enabled: Yes
Runs (Optimiser):  200



  Contract Source Code   Find Similiar Contracts

pragma solidity ^0.4.24;
 
// File: zeppelin-solidity/contracts/introspection/ERC165.sol
 
/**
* @title ERC165
* @dev https://github.com/ethereum/EIPs/blob/master/EIPS/eip-165.md
*/
interface ERC165 {
 
  /**
   * @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);
}
 
// File: zeppelin-solidity/contracts/token/ERC721/ERC721Basic.sol
 
/**
* @title ERC721 Non-Fungible Token Standard basic interface
* @dev see https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
*/
contract ERC721Basic is ERC165 {
  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 exists(uint256 _tokenId) public view returns (bool _exists);
 
  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;
}
 
// File: zeppelin-solidity/contracts/token/ERC721/ERC721.sol
 
/**
* @title ERC-721 Non-Fungible Token Standard, optional enumeration extension
* @dev See https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
*/
contract ERC721Enumerable is ERC721Basic {
  function totalSupply() public view returns (uint256);
  function tokenOfOwnerByIndex(
    address _owner,
    uint256 _index
  )
    public
    view
    returns (uint256 _tokenId);
 
  function tokenByIndex(uint256 _index) public view returns (uint256);
}
 
 
/**
* @title ERC-721 Non-Fungible Token Standard, optional metadata extension
* @dev See https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
*/
contract ERC721Metadata is ERC721Basic {
  function name() external view returns (string _name);
  function symbol() external view returns (string _symbol);
  function tokenURI(uint256 _tokenId) public view returns (string);
}
 
 
/**
* @title ERC-721 Non-Fungible Token Standard, full implementation interface
* @dev See https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
*/
contract ERC721 is ERC721Basic, ERC721Enumerable, ERC721Metadata {
}
 
// File: zeppelin-solidity/contracts/token/ERC721/ERC721Receiver.sol
 
/**
* @title ERC721 token receiver interface
* @dev Interface for any contract that wants to support safeTransfers
* from ERC721 asset contracts.
*/
contract ERC721Receiver {
  /**
   * @dev Magic value to be returned upon successful reception of an NFT
   *  Equals to `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`,
   *  which can be also obtained as `ERC721Receiver(0).onERC721Received.selector`
   */
  bytes4 internal constant ERC721_RECEIVED = 0x150b7a02;
 
  /**
   * @notice Handle the receipt of an NFT
   * @dev The ERC721 smart contract calls this function on the recipient
   * after a `safetransfer`. This function MAY throw to revert and reject the
   * transfer. Return of other than the magic value MUST result in the
   * transaction being reverted.
   * Note: the 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 transfered
   * @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);
}
 
// File: zeppelin-solidity/contracts/math/SafeMath.sol
 
/**
* @title SafeMath
* @dev Math operations with safety checks that throw on error
*/
library SafeMath {
 
  /**
  * @dev Multiplies two numbers, throws on overflow.
  */
  function mul(uint256 a, uint256 b) internal pure returns (uint256 c) {
    // Gas optimization: this is cheaper than asserting '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;
    }
 
    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 a / b;
  }
 
  /**
  * @dev Subtracts 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 c) {
    c = a + b;
    assert(c >= a);
    return c;
  }
}
 
// File: zeppelin-solidity/contracts/AddressUtils.sol
 
/**
* Utility library of inline functions on addresses
*/
library AddressUtils {
 
  /**
   * 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 addr address to check
   * @return whether the target address is a contract
   */
  function isContract(address addr) 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(addr) }
    return size > 0;
  }
 
}
 
// File: zeppelin-solidity/contracts/introspection/SupportsInterfaceWithLookup.sol
 
/**
* @title SupportsInterfaceWithLookup
* @author Matt Condon (@shrugs)
* @dev Implements ERC165 using a lookup table.
*/
contract SupportsInterfaceWithLookup is ERC165 {
  bytes4 public 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) internal supportedInterfaces;
 
  /**
   * @dev A contract implementing SupportsInterfaceWithLookup
   * implement ERC165 itself
   */
  constructor()
    public
  {
    _registerInterface(InterfaceId_ERC165);
  }
 
  /**
   * @dev implement supportsInterface(bytes4) using a lookup table
   */
  function supportsInterface(bytes4 _interfaceId)
    external
    view
    returns (bool)
  {
    return supportedInterfaces[_interfaceId];
  }
 
  /**
   * @dev private method for registering an interface
   */
  function _registerInterface(bytes4 _interfaceId)
    internal
  {
    require(_interfaceId != 0xffffffff);
    supportedInterfaces[_interfaceId] = true;
  }
}
 
// File: zeppelin-solidity/contracts/token/ERC721/ERC721BasicToken.sol
 
/**
* @title ERC721 Non-Fungible Token Standard basic implementation
* @dev see https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
*/
contract ERC721BasicToken is SupportsInterfaceWithLookup, ERC721Basic {
 
  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)'))
   */
 
  bytes4 private constant InterfaceId_ERC721Exists = 0x4f558e79;
  /*
   * 0x4f558e79 ===
   *   bytes4(keccak256('exists(uint256)'))
   */
 
  using SafeMath for uint256;
  using AddressUtils for address;
 
  // Equals to `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`
  // which can be also obtained as `ERC721Receiver(0).onERC721Received.selector`
  bytes4 private constant ERC721_RECEIVED = 0x150b7a02;
 
  // Mapping from token ID to owner
  mapping (uint256 => address) internal tokenOwner;
 
  // Mapping from token ID to approved address
  mapping (uint256 => address) internal tokenApprovals;
 
  // Mapping from owner to number of owned token
  mapping (address => uint256) internal ownedTokensCount;
 
  // Mapping from owner to operator approvals
  mapping (address => mapping (address => bool)) internal operatorApprovals;
 
  /**
   * @dev Guarantees msg.sender is owner of the given token
   * @param _tokenId uint256 ID of the token to validate its ownership belongs to msg.sender
   */
  modifier onlyOwnerOf(uint256 _tokenId) {
    require(ownerOf(_tokenId) == msg.sender);
    _;
  }
 
  /**
   * @dev Checks msg.sender can transfer a token, by being owner, approved, or operator
   * @param _tokenId uint256 ID of the token to validate
   */
  modifier canTransfer(uint256 _tokenId) {
    require(isApprovedOrOwner(msg.sender, _tokenId));
    _;
  }
 
  constructor()
    public
  {
    // register the supported interfaces to conform to ERC721 via ERC165
    _registerInterface(InterfaceId_ERC721);
    _registerInterface(InterfaceId_ERC721Exists);
  }
 
  /**
   * @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 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) public view returns (bool) {
    address owner = tokenOwner[_tokenId];
    return owner != address(0);
  }
 
  /**
   * @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
   * @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) {
    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
    canTransfer(_tokenId)
  {
    require(_from != address(0));
    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
    canTransfer(_tokenId)
  {
    // 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
    canTransfer(_tokenId)
  {
    transferFrom(_from, _to, _tokenId);
    // solium-disable-next-line arg-overflow
    require(checkAndCallSafeTransfer(_from, _to, _tokenId, _data));
  }
 
  /**
   * @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 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) internal {
    require(ownerOf(_tokenId) == _owner);
    if (tokenApprovals[_tokenId] != address(0)) {
      tokenApprovals[_tokenId] = address(0);
    }
  }
 
  /**
   * @dev Internal function to add a token ID to the list of a given address
   * @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
   * @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 checkAndCallSafeTransfer(
    address _from,
    address _to,
    uint256 _tokenId,
    bytes _data
  )
    internal
    returns (bool)
  {
    if (!_to.isContract()) {
      return true;
    }
    bytes4 retval = ERC721Receiver(_to).onERC721Received(
      msg.sender, _from, _tokenId, _data);
    return (retval == ERC721_RECEIVED);
  }
}
 
// File: zeppelin-solidity/contracts/token/ERC721/ERC721Token.sol
 
/**
* @title Full ERC721 Token
* This implementation includes all the required and some optional functionality of the ERC721 standard
* Moreover, it includes approve all functionality using operator terminology
* @dev see https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
*/
contract ERC721Token is SupportsInterfaceWithLookup, ERC721BasicToken, ERC721 {
 
  bytes4 private constant InterfaceId_ERC721Enumerable = 0x780e9d63;
  /**
   * 0x780e9d63 ===
   *   bytes4(keccak256('totalSupply()')) ^
   *   bytes4(keccak256('tokenOfOwnerByIndex(address,uint256)')) ^
   *   bytes4(keccak256('tokenByIndex(uint256)'))
   */
 
  bytes4 private constant InterfaceId_ERC721Metadata = 0x5b5e139f;
  /**
   * 0x5b5e139f ===
   *   bytes4(keccak256('name()')) ^
   *   bytes4(keccak256('symbol()')) ^
   *   bytes4(keccak256('tokenURI(uint256)'))
   */
 
  // Token name
  string internal name_;
 
  // Token symbol
  string internal symbol_;
 
  // Mapping from owner to list of owned token IDs
  mapping(address => uint256[]) internal ownedTokens;
 
  // Mapping from token ID to index of the owner tokens list
  mapping(uint256 => uint256) internal ownedTokensIndex;
 
  // Array with all token ids, used for enumeration
  uint256[] internal allTokens;
 
  // Mapping from token id to position in the allTokens array
  mapping(uint256 => uint256) internal allTokensIndex;
 
  // Optional mapping for token URIs
 mapping(uint256 => string) internal tokenURIs;
 
  /**
   * @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_ERC721Enumerable);
    _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) public view returns (string) {
    require(exists(_tokenId));
    return tokenURIs[_tokenId];
  }
 
  /**
   * @dev Gets the token ID at a given index of the tokens list of the requested owner
   * @param _owner address owning the tokens list to be accessed
   * @param _index uint256 representing the index to be accessed of the requested tokens list
   * @return uint256 token ID at the given index of the tokens list owned by the requested address
   */
  function tokenOfOwnerByIndex(
    address _owner,
    uint256 _index
  )
    public
    view
    returns (uint256)
  {
    require(_index < balanceOf(_owner));
    return ownedTokens[_owner][_index];
  }
 
  /**
   * @dev Gets the total amount of tokens stored by the contract
   * @return uint256 representing the total amount of tokens
   */
  function totalSupply() public view returns (uint256) {
    return allTokens.length;
  }
 
  /**
   * @dev Gets the token ID at a given index of all the tokens in this contract
   * Reverts if the index is greater or equal to the total number of tokens
   * @param _index uint256 representing the index to be accessed of the tokens list
   * @return uint256 token ID at the given index of the tokens list
   */
  function tokenByIndex(uint256 _index) public view returns (uint256) {
    require(_index < totalSupply());
    return allTokens[_index];
  }
 
  /**
   * @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 add a token ID to the list of a given address
   * @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 {
    super.addTokenTo(_to, _tokenId);
    uint256 length = ownedTokens[_to].length;
    ownedTokens[_to].push(_tokenId);
    ownedTokensIndex[_tokenId] = length;
  }
 
  /**
   * @dev Internal function to remove a token ID from the list of a given address
   * @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 {
    super.removeTokenFrom(_from, _tokenId);
 
    uint256 tokenIndex = ownedTokensIndex[_tokenId];
    uint256 lastTokenIndex = ownedTokens[_from].length.sub(1);
    uint256 lastToken = ownedTokens[_from][lastTokenIndex];
 
    ownedTokens[_from][tokenIndex] = lastToken;
    ownedTokens[_from][lastTokenIndex] = 0;
    // Note that this will handle single-element arrays. In that case, both tokenIndex and lastTokenIndex are going to
    // be zero. Then we can make sure that we will remove _tokenId from the ownedTokens list since we are first swapping
    // the lastToken to the first position, and then dropping the element placed in the last position of the list
 
    ownedTokens[_from].length--;
    ownedTokensIndex[_tokenId] = 0;
    ownedTokensIndex[lastToken] = tokenIndex;
  }
 
  /**
   * @dev Internal function to mint a new token
   * Reverts if the given token ID already exists
   * @param _to address the beneficiary 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 {
    super._mint(_to, _tokenId);
 
    allTokensIndex[_tokenId] = allTokens.length;
    allTokens.push(_tokenId);
  }
 
  /**
   * @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];
    }
 
    // Reorg all tokens array
    uint256 tokenIndex = allTokensIndex[_tokenId];
    uint256 lastTokenIndex = allTokens.length.sub(1);
    uint256 lastToken = allTokens[lastTokenIndex];
 
    allTokens[tokenIndex] = lastToken;
    allTokens[lastTokenIndex] = 0;
 
    allTokens.length--;
    allTokensIndex[_tokenId] = 0;
    allTokensIndex[lastToken] = tokenIndex;
  }
 
}
 
// File: zeppelin-solidity/contracts/ownership/Ownable.sol
 
/**
* @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 OwnershipRenounced(address indexed previousOwner);
  event OwnershipTransferred(
    address indexed previousOwner,
    address indexed newOwner
  );
 
 
  /**
   * @dev The Ownable constructor sets the original `owner` of the contract to the sender
   * account.
   */
  constructor() 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 relinquish control of the contract.
   * @notice Renouncing to ownership will leave the contract without an owner.
   * It will not be possible to call the functions with the `onlyOwner`
   * modifier anymore.
   */
  function renounceOwnership() public onlyOwner {
    emit OwnershipRenounced(owner);
    owner = address(0);
 }
 
  /**
   * @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 {
    _transferOwnership(_newOwner);
  }
 
  /**
   * @dev Transfers control of the contract to a newOwner.
   * @param _newOwner The address to transfer ownership to.
   */
  function _transferOwnership(address _newOwner) internal {
    require(_newOwner != address(0));
    emit OwnershipTransferred(owner, _newOwner);
    owner = _newOwner;
  }
}
 
// File: zeppelin-solidity/contracts/lifecycle/Pausable.sol
 
/**
* @title Pausable
* @dev Base contract which allows children to implement an emergency stop mechanism.
*/
contract Pausable is Ownable {
  event Pause();
  event Unpause();
 
  bool public paused = false;
 
 
  /**
   * @dev Modifier to make a function callable only when the contract is not paused.
   */
  modifier whenNotPaused() {
    require(!paused,"Contract is paused");
    _;
  }
 
  /**
   * @dev Modifier to make a function callable only when the contract is paused.
   */
  modifier whenPaused() {
    require(paused,"Contract is not paused");
    _;
  }
 
  /**
   * @dev called by the owner to pause, triggers stopped state
   */
  function pause() onlyOwner whenNotPaused public {
    paused = true;
    emit Pause();
  }
 
  /**
   * @dev called by the owner to unpause, returns to normal state
   */
  function unpause() onlyOwner whenPaused public {
    paused = false;
    emit Unpause();
  }
}
 
// File: contracts/HodlEarth.sol
 
/***
*
* need to add pausable when minting need to check that it doesnt exist first
* need to allow the minter to attribute up to X tokens
*/
contract HodlEarthToken is ERC721Token, Ownable, Pausable {
  string public constant name = "HodlEarthToken";
  string public constant symbol = "HEAR";
 
  constructor() ERC721Token(name, symbol) public {
    owner = msg.sender;
  }
 
  mapping (uint256 => bytes7) public plotColours;
  mapping (uint256 => bytes32) public plotDescriptors;
 
  function calculatePlotPrice() public view returns(uint256 currentPlotPrice){
 
    if(totalSupply() < 250000){
        currentPlotPrice = 0.0004 * 1000000000000000000;
    } else currentPlotPrice = 0.001 * 1000000000000000000;
 
  }
 
  function calculateTransactionFee(uint256 _noPlots,bool _updatePlot) public pure returns(uint256 fee){
 
    uint256 plotPrice;
    plotPrice = 0.001 * 1000000000000000000;
    fee = plotPrice.div(10);
    fee = fee.mul(_noPlots);
 
    if(_updatePlot == false){
       
       uint256 minFee = 0.001 * 1000000000000000000;
       if(fee < minFee) fee = minFee;
    }
 
  }
 
  function transferFrom(address _from, address _to, uint256 _tokenId) public whenNotPaused{
 
    super.transferFrom(_from,_to,_tokenId);
 
  }
 
  function safeTransferFrom(address _from, address _to, uint256 _tokenId) public whenNotPaused{
 
    super.safeTransferFrom(_from,_to,_tokenId);
 
  }
 
  function safeTransferFrom(address _from,address _to,uint256 _tokenId,bytes _data) public whenNotPaused{
 
    super.safeTransferFrom(_from,_to,_tokenId,_data);
 
  }
 
  function getPlot(uint256 _plotLat,uint256 _plotLng) public view returns(uint256 plotReference,bytes7 colour,bytes32 descriptor){
 
    plotReference = _generatePlotReference(_plotLat,_plotLng);
    colour = plotColours[plotReference];
    descriptor = plotDescriptors[plotReference];
 
  }
 
  function getPlotByReference(uint256 _plotReference) public view returns(bytes7 colour,bytes32 descriptor){
 
    colour = plotColours[_plotReference];
    descriptor = plotDescriptors[_plotReference];
 
  }
 
 
  function getPlots(uint256[] _plotLats,uint256[] _plotLngs) public view returns(uint256[],bytes7[],bytes32[]){
 
    uint arrayLength = _plotLats.length;
    uint256 plotReference;
    uint256[] memory plotIds = new uint[](arrayLength);
    bytes7[] memory colours = new bytes7[](arrayLength);
    bytes32[] memory descriptors = new bytes32[](arrayLength);
    for (uint i=0; i<arrayLength; i++) {
      plotReference = _generatePlotReference(_plotLats[i],_plotLngs[i]);
      plotIds[i] = plotReference;
      colours[i] =  plotColours[plotReference];
      descriptors[i] = plotDescriptors[plotReference];
 
    }
 
    return(plotIds,colours,descriptors);
  }
 
 
  function getPlotsByReference(uint256[] _plotReferences) public view returns(uint256[],bytes7[],bytes32[]){
 
    uint arrayLength = _plotReferences.length;
    uint256[] memory plotIds = new uint[](arrayLength);
    bytes7[] memory colours = new bytes7[](arrayLength);
    bytes32[] memory descriptors = new bytes32[](arrayLength);
    for (uint i=0; i<arrayLength; i++) {
      plotIds[i] = _plotReferences[i];
      colours[i] =  plotColours[_plotReferences[i]];
      descriptors[i] = plotDescriptors[_plotReferences[i]];
    }
 
    return(plotIds,colours,descriptors);
  }
 
 
  function newPlot(uint256 _plotLat,uint256 _plotLng,bytes7 _colour,bytes32 _title) public payable whenNotPaused{
 
    uint256 plotReference;
    bool validLatLng;
    uint256 plotPrice;
    uint256 transactionFee;
 
    //check the amount sent
    plotPrice = calculatePlotPrice();
    transactionFee = calculateTransactionFee(1,false);
    if(msg.sender != owner){
        require(
            msg.value >= plotPrice + transactionFee,
            "Insufficient Eth sent."
        );
    }
 
    validLatLng = validatePlotLatLng(_plotLat,_plotLng);
    require(
        validLatLng == true,
        "Lat long is invalid"
    );
    plotReference = _generatePlotReference(_plotLat,_plotLng);
    require(
       plotColours[plotReference] == 0,
      "Plot already exists."
    );
    _addPlot(plotReference,_colour,_title);
 
  }
  function newPlots(uint256[] _plotLat,uint256[] _plotLng,bytes7[] _colours,bytes32[] _descriptors) public payable whenNotPaused{
 
    uint256 noPlots = _plotLat.length;
    bytes7 colour;
    bytes32 descriptor;
    uint256 plotReference;
    bool validLatLng;
    uint256 plotPrice;
    uint256 transactionFee;
 
    plotPrice = calculatePlotPrice();
    transactionFee = calculateTransactionFee(noPlots,false);
 
    if(msg.sender != owner){
      require(
        msg.value >= plotPrice.mul(noPlots) + transactionFee,
        "Insufficient Eth sent."
      );
    }
 
    for (uint i=0; i<noPlots; i++) {
        colour =  _colours[i];
        descriptor = _descriptors[i];
        validLatLng = validatePlotLatLng(_plotLat[i],_plotLng[i]);
        require(
           validLatLng == true,
           "Lat long is invalid"
        );
        plotReference = _generatePlotReference(_plotLat[i],_plotLng[i]);
        require(
           plotColours[plotReference] == 0,
          "Plot already exists."
        );
        _addPlot(plotReference,colour,descriptor);
    }
 
  }
 
  function _generatePlotReference(uint256 _plotLat,uint256 _plotLng) internal pure returns(uint256 plotReference){
 
    plotReference = (_plotLat * 1000000000) + _plotLng;
 
  }
 
  function _addPlot(uint256 _plotReference,bytes7 _colour,bytes32 _descriptor) private{
 
    //check that the plotreference does not already exist
    plotColours[_plotReference] =  _colour;
    plotDescriptors[_plotReference] =  _descriptor;
    _mint(msg.sender, _plotReference);
  }
 
  function validatePlotLatLng(uint256 _lat,uint256 _lng) public pure returns(bool){
    //confirm the lat and long conforms to the hodlearth dimensions
    if(_lat%5 == 0 && _lng%8 == 0) return true;
    return false;
  }
 
  function updatePlot(uint256 _plotLat,uint256 _plotLng,bytes7 _colour,bytes32 _descriptor) public payable whenNotPaused{
 
    uint256 plotReference;
    uint256 transactionFee;
 
    plotReference = _generatePlotReference(_plotLat,_plotLng);
    transactionFee = calculateTransactionFee(1,true);
 
    require(
      ownerOf(plotReference) == msg.sender,
      "Update can only be carried out by the plot owner."
    );
 
    if(msg.sender != owner){
      require(
      msg.value >= transactionFee,
          "Insufficient Eth sent."
      );
    }
    require(
      plotColours[plotReference] != 0,
      "Plot does not exist."
    );
 
 
    plotColours[plotReference] =  _colour;
    plotDescriptors[plotReference] = _descriptor;
  }
 
  function updatePlots(uint256[] _plotLat,uint256[] _plotLng,bytes7[] _colours,bytes32[] _descriptors) public payable whenNotPaused{
 
    uint256 noPlots = _plotLat.length;
    bytes7 colour;
    bytes32 descriptor;
    uint256 plotReference;
    uint256 transactionFee;
 
    transactionFee = calculateTransactionFee(noPlots,true);
 
    if(msg.sender != owner){
      require(
      msg.value >= transactionFee,
          "Insufficient Eth sent."
     );
    }
 
    for (uint i=0; i<noPlots; i++) {
        colour =  _colours[i];
        descriptor = _descriptors[i];
        plotReference = _generatePlotReference(_plotLat[i],_plotLng[i]);
        require(
            plotColours[plotReference] != 0,
            "Plot does not exist."
        );
        require(
            ownerOf(plotReference) == msg.sender,
            "Update can only be carried out by the plot owner."
        );
 
 
        plotColours[plotReference] =  colour;
        plotDescriptors[plotReference] = descriptor;
    }
  }
 
  function withdraw() public onlyOwner returns(bool) {
     owner.transfer(address(this).balance);
     return true;
  }
 
}

    Contract ABI  
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  Contract Creation Code Switch To Opcodes View
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