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•  contract ERC721Basic
•    - function balanceOf(address _owner)
•    - function ownerOf(uint256 _tokenId)
•    - function exists(uint256 _tokenId)
•    - function approve(address _to, uint256 ...
•    - function getApproved(uint256 _tokenId ...
•    - function setApprovalForAll(address _o ...
•    - function isApprovedForAll(address _ow ...
•    - function transferFrom(address _from, ...
•    - function safeTransferFrom(address _fr ...
•    - function safeTransferFrom(
•  contract Ownable
•    - function Ownable()
•    - function transferOwnership(address ne ...
•  contract StrikersMetadata
•    - function tokenURI(uint256 _tokenId)
•    - function strConcat(string _a, string ...
•    - function uint2str(uint i)
•  contract ERC721Enumerable is ERC72 ...
•    - function totalSupply()
•    - function tokenOfOwnerByIndex(address ...
•    - function tokenByIndex(uint256 _index)
•  contract ERC721Metadata is ERC721B ...
•    - function name()
•    - function symbol()
•    - function tokenURI(uint256 _tokenId)
•  contract ERC721 is ERC721Basic, ER ...
•  contract ERC721Receiver
•    - function onERC721Received(address _fr ...
• library SafeMath
•    - function mul(uint256 a, uint256 b)
•    - function div(uint256 a, uint256 b)
•    - function sub(uint256 a, uint256 b)
•    - function add(uint256 a, uint256 b)
• library AddressUtils
•    - function isContract(address addr)
•  contract ERC721BasicToken is ERC72 ...
•    - function balanceOf(address _owner)
•    - function ownerOf(uint256 _tokenId)
•    - function exists(uint256 _tokenId)
•    - function approve(address _to, uint256 ...
•    - function getApproved(uint256 _tokenId ...
•    - function setApprovalForAll(address _t ...
•    - function isApprovedForAll(address _ow ...
•    - function transferFrom(address _from, ...
•    - function safeTransferFrom(
•    - function safeTransferFrom(
•    - function isApprovedOrOwner(address _s ...
•    - function _mint(address _to, uint256 _ ...
•    - function _burn(address _owner, uint25 ...
•    - function clearApproval(address _owner ...
•    - function addTokenTo(address _to, uint ...
•    - function removeTokenFrom(address _fro ...
•    - function checkAndCallSafeTransfer(
•  contract ERC721Token is ERC721, ER ...
•    - function ERC721Token(string _name, st ...
•    - function name()
•    - function symbol()
•    - function tokenURI(uint256 _tokenId)
•    - function tokenOfOwnerByIndex(address ...
•    - function totalSupply()
•    - function tokenByIndex(uint256 _index)
•    - function _setTokenURI(uint256 _tokenI ...
•    - function addTokenTo(address _to, uint ...
•    - function removeTokenFrom(address _fro ...
•    - function _mint(address _to, uint256 _ ...
•    - function _burn(address _owner, uint25 ...
•  contract StrikersPlayerList is Own ...
•    - function addPlayer(string _name)
•  contract StrikersChecklist is Stri ...
•    - function _addOriginalChecklistItem(ui ...
•    - function _addIconicChecklistItem(uint ...
•    - function addUnreleasedChecklistItem(u ...
•    - function originalsCount()
•    - function iconicsCount()
•    - function unreleasedCount()
•    - function deployStepOne()
•    - function deployStepTwo()
•    - function deployStepThree()
•    - function deployStepFour()
•    - function limitForChecklistId(uint8 _c ...
•  contract StrikersBase is ERC721Tok ...
•    - function cardAndChecklistIdsForOwner( ...
•    - function _mintCard(
•  contract Pausable is Ownable
•    - function pause()
•    - function unpause()
•  contract StrikersMinting is Strike ...
•    - function setPackSaleAddress(address _ ...
•    - function mintPackSaleCard(uint8 _chec ...
•    - function mintUnreleasedCard(uint8 _ch ...
•    - function pullFromCirculation(uint8 _c ...
•  contract StrikersTrading is Strike ...
•    - function fillTrade(
•    - function cancelTrade(
•    - function getTradeHash(
•    - function isValidSignature(
•  contract StrikersCore is StrikersT ... *
•    - function setMetadataAddress(address _ ...
•    - function tokenURI(uint256 _tokenId)

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/**
 *Submitted for verification at Etherscan.io on 2018-06-09
*/

pragma solidity ^0.4.21;


/**
 * @title ERC721 Non-Fungible Token Standard basic interface
 * @dev see https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
 */
contract ERC721Basic {
  event Transfer(address indexed _from, address indexed _to, uint256 _tokenId);
  event Approval(address indexed _owner, address indexed _approved, uint256 _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;
}



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


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


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

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

  /**
   * @dev Allows the current owner to transfer control of the contract to a newOwner.
   * @param newOwner The address to transfer ownership to.
   */
  function transferOwnership(address newOwner) public onlyOwner {
    require(newOwner != address(0));
    emit OwnershipTransferred(owner, newOwner);
    owner = newOwner;
  }

}


/// @title An optional contract that allows us to associate metadata to our cards.
/// @author The CryptoStrikers Team
contract StrikersMetadata {

  /// @dev The base url for the API where we fetch the metadata.
  ///   ex: https://us-central1-cryptostrikers-api.cloudfunctions.net/cards/
  string public apiUrl;

  constructor(string _apiUrl) public {
    apiUrl = _apiUrl;
  }

  /// @dev Returns the API URL for a given token Id.
  ///   ex: https://us-central1-cryptostrikers-api.cloudfunctions.net/cards/22
  ///   Right now, this endpoint returns a JSON blob conforming to OpenSea's spec.
  ///   see: https://docs.opensea.io/docs/2-adding-metadata
  function tokenURI(uint256 _tokenId) external view returns (string) {
    string memory _id = uint2str(_tokenId);
    return strConcat(apiUrl, _id);
  }

  // String helpers below were taken from Oraclize.
  // https://github.com/oraclize/ethereum-api/blob/master/oraclizeAPI_0.4.sol

  function strConcat(string _a, string _b) internal pure returns (string) {
    bytes memory _ba = bytes(_a);
    bytes memory _bb = bytes(_b);
    string memory ab = new string(_ba.length + _bb.length);
    bytes memory bab = bytes(ab);
    uint k = 0;
    for (uint i = 0; i < _ba.length; i++) bab[k++] = _ba[i];
    for (i = 0; i < _bb.length; i++) bab[k++] = _bb[i];
    return string(bab);
  }

  function uint2str(uint i) internal pure returns (string) {
    if (i == 0) return "0";
    uint j = i;
    uint len;
    while (j != 0) {
      len++;
      j /= 10;
    }
    bytes memory bstr = new bytes(len);
    uint k = len - 1;
    while (i != 0) {
      bstr[k--] = byte(48 + i % 10);
      i /= 10;
    }
    return string(bstr);
  }
}
















/**
 * @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() public view returns (string _name);
  function symbol() public 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 {
}







/**
 * @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,uint256,bytes)"))`,
   *  which can be also obtained as `ERC721Receiver(0).onERC721Received.selector`
   */
  bytes4 constant ERC721_RECEIVED = 0xf0b9e5ba;

  /**
   * @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. This function MUST use 50,000 gas or less. Return of other
   *  than the magic value MUST result in the transaction being reverted.
   *  Note: the contract address is always the message sender.
   * @param _from The sending address
   * @param _tokenId The NFT identifier which is being transfered
   * @param _data Additional data with no specified format
   * @return `bytes4(keccak256("onERC721Received(address,uint256,bytes)"))`
   */
  function onERC721Received(address _from, uint256 _tokenId, bytes _data) public returns(bytes4);
}




/**
 * @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) {
    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;
  }
}




/**
 * 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.
    assembly { size := extcodesize(addr) }  // solium-disable-line security/no-inline-assembly
    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 ERC721BasicToken is ERC721Basic {
  using SafeMath for uint256;
  using AddressUtils for address;

  // Equals to `bytes4(keccak256("onERC721Received(address,uint256,bytes)"))`
  // which can be also obtained as `ERC721Receiver(0).onERC721Received.selector`
  bytes4 constant ERC721_RECEIVED = 0xf0b9e5ba;

  // 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));
    _;
  }

  /**
   * @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 existance 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
   * @dev The zero address indicates there is no approved address.
   * @dev There can only be one approved address per token at a given time.
   * @dev 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));

    if (getApproved(_tokenId) != address(0) || _to != address(0)) {
      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 a 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
   * @dev 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
   * @dev Usage of this method is discouraged, use `safeTransferFrom` whenever possible
   * @dev 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
   * @dev 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,uint256,bytes)"))`; otherwise,
   *  the transfer is reverted.
   * @dev 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
   * @dev 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,uint256,bytes)"))`; otherwise,
   *  the transfer is reverted.
   * @dev 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);
    return _spender == owner || getApproved(_tokenId) == _spender || isApprovedForAll(owner, _spender);
  }

  /**
   * @dev Internal function to mint a new token
   * @dev 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
   * @dev 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
   * @dev 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);
      emit Approval(_owner, address(0), _tokenId);
    }
  }

  /**
   * @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
   * @dev 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(_from, _tokenId, _data);
    return (retval == ERC721_RECEIVED);
  }
}



/**
 * @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 ERC721, ERC721BasicToken {
  // 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
   */
  function ERC721Token(string _name, string _symbol) public {
    name_ = _name;
    symbol_ = _symbol;
  }

  /**
   * @dev Gets the token name
   * @return string representing the token name
   */
  function name() public view returns (string) {
    return name_;
  }

  /**
   * @dev Gets the token symbol
   * @return string representing the token symbol
   */
  function symbol() public view returns (string) {
    return symbol_;
  }

  /**
   * @dev Returns an URI for a given token ID
   * @dev 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
   * @dev 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
   * @dev 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
   * @dev 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
   * @dev 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;
  }

}







/// @title The contract that manages all the players that appear in our game.
/// @author The CryptoStrikers Team
contract StrikersPlayerList is Ownable {
  // We only use playerIds in StrikersChecklist.sol (to
  // indicate which player features on instances of a
  // given ChecklistItem), and nowhere else in the app.
  // While it's not explictly necessary for any of our
  // contracts to know that playerId 0 corresponds to
  // Lionel Messi, we think that it's nice to have
  // a canonical source of truth for who the playerIds
  // actually refer to. Storing strings (player names)
  // is expensive, so we just use Events to prove that,
  // at some point, we said a playerId represents a given person.

  /// @dev The event we fire when we add a player.
  event PlayerAdded(uint8 indexed id, string name);

  /// @dev How many players we've added so far
  ///   (max 255, though we don't plan on getting close)
  uint8 public playerCount;

  /// @dev Here we add the players we are launching with on Day 1.
  ///   Players are loosely ranked by things like FIFA ratings,
  ///   number of Instagram followers, and opinions of CryptoStrikers
  ///   team members. Feel free to yell at us on Twitter.
  constructor() public {
    addPlayer("Lionel Messi"); // 0
    addPlayer("Cristiano Ronaldo"); // 1
    addPlayer("Neymar"); // 2
    addPlayer("Mohamed Salah"); // 3
    addPlayer("Robert Lewandowski"); // 4
    addPlayer("Kevin De Bruyne"); // 5
    addPlayer("Luka Modrić"); // 6
    addPlayer("Eden Hazard"); // 7
    addPlayer("Sergio Ramos"); // 8
    addPlayer("Toni Kroos"); // 9
    addPlayer("Luis Suárez"); // 10
    addPlayer("Harry Kane"); // 11
    addPlayer("Sergio Agüero"); // 12
    addPlayer("Kylian Mbappé"); // 13
    addPlayer("Gonzalo Higuaín"); // 14
    addPlayer("David de Gea"); // 15
    addPlayer("Antoine Griezmann"); // 16
    addPlayer("N'Golo Kanté"); // 17
    addPlayer("Edinson Cavani"); // 18
    addPlayer("Paul Pogba"); // 19
    addPlayer("Isco"); // 20
    addPlayer("Marcelo"); // 21
    addPlayer("Manuel Neuer"); // 22
    addPlayer("Dries Mertens"); // 23
    addPlayer("James Rodríguez"); // 24
    addPlayer("Paulo Dybala"); // 25
    addPlayer("Christian Eriksen"); // 26
    addPlayer("David Silva"); // 27
    addPlayer("Gabriel Jesus"); // 28
    addPlayer("Thiago"); // 29
    addPlayer("Thibaut Courtois"); // 30
    addPlayer("Philippe Coutinho"); // 31
    addPlayer("Andrés Iniesta"); // 32
    addPlayer("Casemiro"); // 33
    addPlayer("Romelu Lukaku"); // 34
    addPlayer("Gerard Piqué"); // 35
    addPlayer("Mats Hummels"); // 36
    addPlayer("Diego Godín"); // 37
    addPlayer("Mesut Özil"); // 38
    addPlayer("Son Heung-min"); // 39
    addPlayer("Raheem Sterling"); // 40
    addPlayer("Hugo Lloris"); // 41
    addPlayer("Radamel Falcao"); // 42
    addPlayer("Ivan Rakitić"); // 43
    addPlayer("Leroy Sané"); // 44
    addPlayer("Roberto Firmino"); // 45
    addPlayer("Sadio Mané"); // 46
    addPlayer("Thomas Müller"); // 47
    addPlayer("Dele Alli"); // 48
    addPlayer("Keylor Navas"); // 49
    addPlayer("Thiago Silva"); // 50
    addPlayer("Raphaël Varane"); // 51
    addPlayer("Ángel Di María"); // 52
    addPlayer("Jordi Alba"); // 53
    addPlayer("Medhi Benatia"); // 54
    addPlayer("Timo Werner"); // 55
    addPlayer("Gylfi Sigurðsson"); // 56
    addPlayer("Nemanja Matić"); // 57
    addPlayer("Kalidou Koulibaly"); // 58
    addPlayer("Bernardo Silva"); // 59
    addPlayer("Vincent Kompany"); // 60
    addPlayer("João Moutinho"); // 61
    addPlayer("Toby Alderweireld"); // 62
    addPlayer("Emil Forsberg"); // 63
    addPlayer("Mario Mandžukić"); // 64
    addPlayer("Sergej Milinković-Savić"); // 65
    addPlayer("Shinji Kagawa"); // 66
    addPlayer("Granit Xhaka"); // 67
    addPlayer("Andreas Christensen"); // 68
    addPlayer("Piotr Zieliński"); // 69
    addPlayer("Fyodor Smolov"); // 70
    addPlayer("Xherdan Shaqiri"); // 71
    addPlayer("Marcus Rashford"); // 72
    addPlayer("Javier Hernández"); // 73
    addPlayer("Hirving Lozano"); // 74
    addPlayer("Hakim Ziyech"); // 75
    addPlayer("Victor Moses"); // 76
    addPlayer("Jefferson Farfán"); // 77
    addPlayer("Mohamed Elneny"); // 78
    addPlayer("Marcus Berg"); // 79
    addPlayer("Guillermo Ochoa"); // 80
    addPlayer("Igor Akinfeev"); // 81
    addPlayer("Sardar Azmoun"); // 82
    addPlayer("Christian Cueva"); // 83
    addPlayer("Wahbi Khazri"); // 84
    addPlayer("Keisuke Honda"); // 85
    addPlayer("Tim Cahill"); // 86
    addPlayer("John Obi Mikel"); // 87
    addPlayer("Ki Sung-yueng"); // 88
    addPlayer("Bryan Ruiz"); // 89
    addPlayer("Maya Yoshida"); // 90
    addPlayer("Nawaf Al Abed"); // 91
    addPlayer("Lee Chung-yong"); // 92
    addPlayer("Gabriel Gómez"); // 93
    addPlayer("Naïm Sliti"); // 94
    addPlayer("Reza Ghoochannejhad"); // 95
    addPlayer("Mile Jedinak"); // 96
    addPlayer("Mohammad Al-Sahlawi"); // 97
    addPlayer("Aron Gunnarsson"); // 98
    addPlayer("Blas Pérez"); // 99
    addPlayer("Dani Alves"); // 100
    addPlayer("Zlatan Ibrahimović"); // 101
  }

  /// @dev Fires an event, proving that we said a player corresponds to a given ID.
  /// @param _name The name of the player we are adding.
  function addPlayer(string _name) public onlyOwner {
    require(playerCount < 255, "You've already added the maximum amount of players.");
    emit PlayerAdded(playerCount, _name);
    playerCount++;
  }
}


/// @title The contract that manages checklist items, sets, and rarity tiers.
/// @author The CryptoStrikers Team
contract StrikersChecklist is StrikersPlayerList {
  // High level overview of everything going on in this contract:
  //
  // ChecklistItem is the parent class to Card and has 3 properties:
  //  - uint8 checklistId (000 to 255)
  //  - uint8 playerId (see StrikersPlayerList.sol)
  //  - RarityTier tier (more info below)
  //
  // Two things to note: the checklistId is not explicitly stored
  // on the checklistItem struct, and it's composed of two parts.
  // (For the following, assume it is left padded with zeros to reach
  // three digits, such that checklistId 0 becomes 000)
  //  - the first digit represents the setId
  //      * 0 = Originals Set
  //      * 1 = Iconics Set
  //      * 2 = Unreleased Set
  //  - the last two digits represent its index in the appropriate set arary
  //
  //  For example, checklist ID 100 would represent fhe first checklist item
  //  in the iconicChecklistItems array (first digit = 1 = Iconics Set, last two
  //  digits = 00 = first index of array)
  //
  // Because checklistId is represented as a uint8 throughout the app, the highest
  // value it can take is 255, which means we can't add more than 56 items to our
  // Unreleased Set's unreleasedChecklistItems array (setId 2). Also, once we've initialized
  // this contract, it's impossible for us to add more checklist items to the Originals
  // and Iconics set -- what you see here is what you get.
  //
  // Simple enough right?

  /// @dev We initialize this contract with so much data that we have
  ///   to stage it in 4 different steps, ~33 checklist items at a time.
  enum DeployStep {
    WaitingForStepOne,
    WaitingForStepTwo,
    WaitingForStepThree,
    WaitingForStepFour,
    DoneInitialDeploy
  }

  /// @dev Enum containing all our rarity tiers, just because
  ///   it's cleaner dealing with these values than with uint8s.
  enum RarityTier {
    IconicReferral,
    IconicInsert,
    Diamond,
    Gold,
    Silver,
    Bronze
  }

  /// @dev A lookup table indicating how limited the cards
  ///   in each tier are. If this value is 0, it means
  ///   that cards of this rarity tier are unlimited,
  ///   which is only the case for the 8 Iconics cards
  ///   we give away as part of our referral program.
  uint16[] public tierLimits = [
    0,    // Iconic - Referral Bonus (uncapped)
    100,  // Iconic Inserts ("Card of the Day")
    1000, // Diamond
    1664, // Gold
    3328, // Silver
    4352  // Bronze
  ];

  /// @dev ChecklistItem is essentially the parent class to Card.
  ///   It represents a given superclass of cards (eg Originals Messi),
  ///   and then each Card is an instance of this ChecklistItem, with
  ///   its own serial number, mint date, etc.
  struct ChecklistItem {
    uint8 playerId;
    RarityTier tier;
  }

  /// @dev The deploy step we're at. Defaults to WaitingForStepOne.
  DeployStep public deployStep;

  /// @dev Array containing all the Originals checklist items (000 - 099)
  ChecklistItem[] public originalChecklistItems;

  /// @dev Array containing all the Iconics checklist items (100 - 131)
  ChecklistItem[] public iconicChecklistItems;

  /// @dev Array containing all the unreleased checklist items (200 - 255 max)
  ChecklistItem[] public unreleasedChecklistItems;

  /// @dev Internal function to add a checklist item to the Originals set.
  /// @param _playerId The player represented by this checklist item. (see StrikersPlayerList.sol)
  /// @param _tier This checklist item's rarity tier. (see Rarity Tier enum and corresponding tierLimits)
  function _addOriginalChecklistItem(uint8 _playerId, RarityTier _tier) internal {
    originalChecklistItems.push(ChecklistItem({
      playerId: _playerId,
      tier: _tier
    }));
  }

  /// @dev Internal function to add a checklist item to the Iconics set.
  /// @param _playerId The player represented by this checklist item. (see StrikersPlayerList.sol)
  /// @param _tier This checklist item's rarity tier. (see Rarity Tier enum and corresponding tierLimits)
  function _addIconicChecklistItem(uint8 _playerId, RarityTier _tier) internal {
    iconicChecklistItems.push(ChecklistItem({
      playerId: _playerId,
      tier: _tier
    }));
  }

  /// @dev External function to add a checklist item to our mystery set.
  ///   Must have completed initial deploy, and can't add more than 56 items (because checklistId is a uint8).
  /// @param _playerId The player represented by this checklist item. (see StrikersPlayerList.sol)
  /// @param _tier This checklist item's rarity tier. (see Rarity Tier enum and corresponding tierLimits)
  function addUnreleasedChecklistItem(uint8 _playerId, RarityTier _tier) external onlyOwner {
    require(deployStep == DeployStep.DoneInitialDeploy, "Finish deploying the Originals and Iconics sets first.");
    require(unreleasedCount() < 56, "You can't add any more checklist items.");
    require(_playerId < playerCount, "This player doesn't exist in our player list.");
    unreleasedChecklistItems.push(ChecklistItem({
      playerId: _playerId,
      tier: _tier
    }));
  }

  /// @dev Returns how many Original checklist items we've added.
  function originalsCount() external view returns (uint256) {
    return originalChecklistItems.length;
  }

  /// @dev Returns how many Iconic checklist items we've added.
  function iconicsCount() public view returns (uint256) {
    return iconicChecklistItems.length;
  }

  /// @dev Returns how many Unreleased checklist items we've added.
  function unreleasedCount() public view returns (uint256) {
    return unreleasedChecklistItems.length;
  }

  // In the next four functions, we initialize this contract with our
  // 132 initial checklist items (100 Originals, 32 Iconics). Because
  // of how much data we need to store, it has to be broken up into
  // four different function calls, which need to be called in sequence.
  // The ordering of the checklist items we add determines their
  // checklist ID, which is left-padded in our frontend to be a
  // 3-digit identifier where the first digit is the setId and the last
  // 2 digits represents the checklist items index in the appropriate ___ChecklistItems array.
  // For example, Originals Messi is the first item for set ID 0, and this
  // is displayed as #000 throughout the app. Our Card struct declare its
  // checklistId property as uint8, so we have
  // to be mindful that we can only have 256 total checklist items.

  /// @dev Deploys Originals #000 through #032.
  function deployStepOne() external onlyOwner {
    require(deployStep == DeployStep.WaitingForStepOne, "You're not following the steps in order...");

    /* ORIGINALS - DIAMOND */
    _addOriginalChecklistItem(0, RarityTier.Diamond); // 000 Messi
    _addOriginalChecklistItem(1, RarityTier.Diamond); // 001 Ronaldo
    _addOriginalChecklistItem(2, RarityTier.Diamond); // 002 Neymar
    _addOriginalChecklistItem(3, RarityTier.Diamond); // 003 Salah

    /* ORIGINALS - GOLD */
    _addOriginalChecklistItem(4, RarityTier.Gold); // 004 Lewandowski
    _addOriginalChecklistItem(5, RarityTier.Gold); // 005 De Bruyne
    _addOriginalChecklistItem(6, RarityTier.Gold); // 006 Modrić
    _addOriginalChecklistItem(7, RarityTier.Gold); // 007 Hazard
    _addOriginalChecklistItem(8, RarityTier.Gold); // 008 Ramos
    _addOriginalChecklistItem(9, RarityTier.Gold); // 009 Kroos
    _addOriginalChecklistItem(10, RarityTier.Gold); // 010 Suárez
    _addOriginalChecklistItem(11, RarityTier.Gold); // 011 Kane
    _addOriginalChecklistItem(12, RarityTier.Gold); // 012 Agüero
    _addOriginalChecklistItem(13, RarityTier.Gold); // 013 Mbappé
    _addOriginalChecklistItem(14, RarityTier.Gold); // 014 Higuaín
    _addOriginalChecklistItem(15, RarityTier.Gold); // 015 de Gea
    _addOriginalChecklistItem(16, RarityTier.Gold); // 016 Griezmann
    _addOriginalChecklistItem(17, RarityTier.Gold); // 017 Kanté
    _addOriginalChecklistItem(18, RarityTier.Gold); // 018 Cavani
    _addOriginalChecklistItem(19, RarityTier.Gold); // 019 Pogba

    /* ORIGINALS - SILVER (020 to 032) */
    _addOriginalChecklistItem(20, RarityTier.Silver); // 020 Isco
    _addOriginalChecklistItem(21, RarityTier.Silver); // 021 Marcelo
    _addOriginalChecklistItem(22, RarityTier.Silver); // 022 Neuer
    _addOriginalChecklistItem(23, RarityTier.Silver); // 023 Mertens
    _addOriginalChecklistItem(24, RarityTier.Silver); // 024 James
    _addOriginalChecklistItem(25, RarityTier.Silver); // 025 Dybala
    _addOriginalChecklistItem(26, RarityTier.Silver); // 026 Eriksen
    _addOriginalChecklistItem(27, RarityTier.Silver); // 027 David Silva
    _addOriginalChecklistItem(28, RarityTier.Silver); // 028 Gabriel Jesus
    _addOriginalChecklistItem(29, RarityTier.Silver); // 029 Thiago
    _addOriginalChecklistItem(30, RarityTier.Silver); // 030 Courtois
    _addOriginalChecklistItem(31, RarityTier.Silver); // 031 Coutinho
    _addOriginalChecklistItem(32, RarityTier.Silver); // 032 Iniesta

    // Move to the next deploy step.
    deployStep = DeployStep.WaitingForStepTwo;
  }

  /// @dev Deploys Originals #033 through #065.
  function deployStepTwo() external onlyOwner {
    require(deployStep == DeployStep.WaitingForStepTwo, "You're not following the steps in order...");

    /* ORIGINALS - SILVER (033 to 049) */
    _addOriginalChecklistItem(33, RarityTier.Silver); // 033 Casemiro
    _addOriginalChecklistItem(34, RarityTier.Silver); // 034 Lukaku
    _addOriginalChecklistItem(35, RarityTier.Silver); // 035 Piqué
    _addOriginalChecklistItem(36, RarityTier.Silver); // 036 Hummels
    _addOriginalChecklistItem(37, RarityTier.Silver); // 037 Godín
    _addOriginalChecklistItem(38, RarityTier.Silver); // 038 Özil
    _addOriginalChecklistItem(39, RarityTier.Silver); // 039 Son
    _addOriginalChecklistItem(40, RarityTier.Silver); // 040 Sterling
    _addOriginalChecklistItem(41, RarityTier.Silver); // 041 Lloris
    _addOriginalChecklistItem(42, RarityTier.Silver); // 042 Falcao
    _addOriginalChecklistItem(43, RarityTier.Silver); // 043 Rakitić
    _addOriginalChecklistItem(44, RarityTier.Silver); // 044 Sané
    _addOriginalChecklistItem(45, RarityTier.Silver); // 045 Firmino
    _addOriginalChecklistItem(46, RarityTier.Silver); // 046 Mané
    _addOriginalChecklistItem(47, RarityTier.Silver); // 047 Müller
    _addOriginalChecklistItem(48, RarityTier.Silver); // 048 Alli
    _addOriginalChecklistItem(49, RarityTier.Silver); // 049 Navas

    /* ORIGINALS - BRONZE (050 to 065) */
    _addOriginalChecklistItem(50, RarityTier.Bronze); // 050 Thiago Silva
    _addOriginalChecklistItem(51, RarityTier.Bronze); // 051 Varane
    _addOriginalChecklistItem(52, RarityTier.Bronze); // 052 Di María
    _addOriginalChecklistItem(53, RarityTier.Bronze); // 053 Alba
    _addOriginalChecklistItem(54, RarityTier.Bronze); // 054 Benatia
    _addOriginalChecklistItem(55, RarityTier.Bronze); // 055 Werner
    _addOriginalChecklistItem(56, RarityTier.Bronze); // 056 Sigurðsson
    _addOriginalChecklistItem(57, RarityTier.Bronze); // 057 Matić
    _addOriginalChecklistItem(58, RarityTier.Bronze); // 058 Koulibaly
    _addOriginalChecklistItem(59, RarityTier.Bronze); // 059 Bernardo Silva
    _addOriginalChecklistItem(60, RarityTier.Bronze); // 060 Kompany
    _addOriginalChecklistItem(61, RarityTier.Bronze); // 061 Moutinho
    _addOriginalChecklistItem(62, RarityTier.Bronze); // 062 Alderweireld
    _addOriginalChecklistItem(63, RarityTier.Bronze); // 063 Forsberg
    _addOriginalChecklistItem(64, RarityTier.Bronze); // 064 Mandžukić
    _addOriginalChecklistItem(65, RarityTier.Bronze); // 065 Milinković-Savić

    // Move to the next deploy step.
    deployStep = DeployStep.WaitingForStepThree;
  }

  /// @dev Deploys Originals #066 through #099.
  function deployStepThree() external onlyOwner {
    require(deployStep == DeployStep.WaitingForStepThree, "You're not following the steps in order...");

    /* ORIGINALS - BRONZE (066 to 099) */
    _addOriginalChecklistItem(66, RarityTier.Bronze); // 066 Kagawa
    _addOriginalChecklistItem(67, RarityTier.Bronze); // 067 Xhaka
    _addOriginalChecklistItem(68, RarityTier.Bronze); // 068 Christensen
    _addOriginalChecklistItem(69, RarityTier.Bronze); // 069 Zieliński
    _addOriginalChecklistItem(70, RarityTier.Bronze); // 070 Smolov
    _addOriginalChecklistItem(71, RarityTier.Bronze); // 071 Shaqiri
    _addOriginalChecklistItem(72, RarityTier.Bronze); // 072 Rashford
    _addOriginalChecklistItem(73, RarityTier.Bronze); // 073 Hernández
    _addOriginalChecklistItem(74, RarityTier.Bronze); // 074 Lozano
    _addOriginalChecklistItem(75, RarityTier.Bronze); // 075 Ziyech
    _addOriginalChecklistItem(76, RarityTier.Bronze); // 076 Moses
    _addOriginalChecklistItem(77, RarityTier.Bronze); // 077 Farfán
    _addOriginalChecklistItem(78, RarityTier.Bronze); // 078 Elneny
    _addOriginalChecklistItem(79, RarityTier.Bronze); // 079 Berg
    _addOriginalChecklistItem(80, RarityTier.Bronze); // 080 Ochoa
    _addOriginalChecklistItem(81, RarityTier.Bronze); // 081 Akinfeev
    _addOriginalChecklistItem(82, RarityTier.Bronze); // 082 Azmoun
    _addOriginalChecklistItem(83, RarityTier.Bronze); // 083 Cueva
    _addOriginalChecklistItem(84, RarityTier.Bronze); // 084 Khazri
    _addOriginalChecklistItem(85, RarityTier.Bronze); // 085 Honda
    _addOriginalChecklistItem(86, RarityTier.Bronze); // 086 Cahill
    _addOriginalChecklistItem(87, RarityTier.Bronze); // 087 Mikel
    _addOriginalChecklistItem(88, RarityTier.Bronze); // 088 Sung-yueng
    _addOriginalChecklistItem(89, RarityTier.Bronze); // 089 Ruiz
    _addOriginalChecklistItem(90, RarityTier.Bronze); // 090 Yoshida
    _addOriginalChecklistItem(91, RarityTier.Bronze); // 091 Al Abed
    _addOriginalChecklistItem(92, RarityTier.Bronze); // 092 Chung-yong
    _addOriginalChecklistItem(93, RarityTier.Bronze); // 093 Gómez
    _addOriginalChecklistItem(94, RarityTier.Bronze); // 094 Sliti
    _addOriginalChecklistItem(95, RarityTier.Bronze); // 095 Ghoochannejhad
    _addOriginalChecklistItem(96, RarityTier.Bronze); // 096 Jedinak
    _addOriginalChecklistItem(97, RarityTier.Bronze); // 097 Al-Sahlawi
    _addOriginalChecklistItem(98, RarityTier.Bronze); // 098 Gunnarsson
    _addOriginalChecklistItem(99, RarityTier.Bronze); // 099 Pérez

    // Move to the next deploy step.
    deployStep = DeployStep.WaitingForStepFour;
  }

  /// @dev Deploys all Iconics and marks the deploy as complete!
  function deployStepFour() external onlyOwner {
    require(deployStep == DeployStep.WaitingForStepFour, "You're not following the steps in order...");

    /* ICONICS */
    _addIconicChecklistItem(0, RarityTier.IconicInsert); // 100 Messi
    _addIconicChecklistItem(1, RarityTier.IconicInsert); // 101 Ronaldo
    _addIconicChecklistItem(2, RarityTier.IconicInsert); // 102 Neymar
    _addIconicChecklistItem(3, RarityTier.IconicInsert); // 103 Salah
    _addIconicChecklistItem(4, RarityTier.IconicInsert); // 104 Lewandowski
    _addIconicChecklistItem(5, RarityTier.IconicInsert); // 105 De Bruyne
    _addIconicChecklistItem(6, RarityTier.IconicInsert); // 106 Modrić
    _addIconicChecklistItem(7, RarityTier.IconicInsert); // 107 Hazard
    _addIconicChecklistItem(8, RarityTier.IconicInsert); // 108 Ramos
    _addIconicChecklistItem(9, RarityTier.IconicInsert); // 109 Kroos
    _addIconicChecklistItem(10, RarityTier.IconicInsert); // 110 Suárez
    _addIconicChecklistItem(11, RarityTier.IconicInsert); // 111 Kane
    _addIconicChecklistItem(12, RarityTier.IconicInsert); // 112 Agüero
    _addIconicChecklistItem(15, RarityTier.IconicInsert); // 113 de Gea
    _addIconicChecklistItem(16, RarityTier.IconicInsert); // 114 Griezmann
    _addIconicChecklistItem(17, RarityTier.IconicReferral); // 115 Kanté
    _addIconicChecklistItem(18, RarityTier.IconicReferral); // 116 Cavani
    _addIconicChecklistItem(19, RarityTier.IconicInsert); // 117 Pogba
    _addIconicChecklistItem(21, RarityTier.IconicInsert); // 118 Marcelo
    _addIconicChecklistItem(24, RarityTier.IconicInsert); // 119 James
    _addIconicChecklistItem(26, RarityTier.IconicInsert); // 120 Eriksen
    _addIconicChecklistItem(29, RarityTier.IconicReferral); // 121 Thiago
    _addIconicChecklistItem(36, RarityTier.IconicReferral); // 122 Hummels
    _addIconicChecklistItem(38, RarityTier.IconicReferral); // 123 Özil
    _addIconicChecklistItem(39, RarityTier.IconicInsert); // 124 Son
    _addIconicChecklistItem(46, RarityTier.IconicInsert); // 125 Mané
    _addIconicChecklistItem(48, RarityTier.IconicInsert); // 126 Alli
    _addIconicChecklistItem(49, RarityTier.IconicReferral); // 127 Navas
    _addIconicChecklistItem(73, RarityTier.IconicInsert); // 128 Hernández
    _addIconicChecklistItem(85, RarityTier.IconicInsert); // 129 Honda
    _addIconicChecklistItem(100, RarityTier.IconicReferral); // 130 Alves
    _addIconicChecklistItem(101, RarityTier.IconicReferral); // 131 Zlatan

    // Mark the initial deploy as complete.
    deployStep = DeployStep.DoneInitialDeploy;
  }

  /// @dev Returns the mint limit for a given checklist item, based on its tier.
  /// @param _checklistId Which checklist item we need to get the limit for.
  /// @return How much of this checklist item we are allowed to mint.
  function limitForChecklistId(uint8 _checklistId) external view returns (uint16) {
    RarityTier rarityTier;
    uint8 index;
    if (_checklistId < 100) { // Originals = #000 to #099
      rarityTier = originalChecklistItems[_checklistId].tier;
    } else if (_checklistId < 200) { // Iconics = #100 to #131
      index = _checklistId - 100;
      require(index < iconicsCount(), "This Iconics checklist item doesn't exist.");
      rarityTier = iconicChecklistItems[index].tier;
    } else { // Unreleased = #200 to max #255
      index = _checklistId - 200;
      require(index < unreleasedCount(), "This Unreleased checklist item doesn't exist.");
      rarityTier = unreleasedChecklistItems[index].tier;
    }
    return tierLimits[uint8(rarityTier)];
  }
}


/// @title Base contract for CryptoStrikers. Defines what a card is and how to mint one.
/// @author The CryptoStrikers Team
contract StrikersBase is ERC721Token("CryptoStrikers", "STRK") {

  /// @dev Emit this event whenever we mint a new card (see _mintCard below)
  event CardMinted(uint256 cardId);

  /// @dev The struct representing the game's main object, a sports trading card.
  struct Card {
    // The timestamp at which this card was minted.
    // With uint32 we are good until 2106, by which point we will have not minted
    // a card in like, 88 years.
    uint32 mintTime;

    // The checklist item represented by this card. See StrikersChecklist.sol for more info.
    uint8 checklistId;

    // Cards for a given player have a serial number, which gets
    // incremented in sequence. For example, if we mint 1000 of a card,
    // the third one to be minted has serialNumber = 3 (out of 1000).
    uint16 serialNumber;
  }

  /*** STORAGE ***/

  /// @dev All the cards that have been minted, indexed by cardId.
  Card[] public cards;

  /// @dev Keeps track of how many cards we have minted for a given checklist item
  ///   to make sure we don't go over the limit for it.
  ///   NB: uint16 has a capacity of 65,535, but we are not minting more than
  ///   4,352 of any given checklist item.
  mapping (uint8 => uint16) public mintedCountForChecklistId;

  /// @dev A reference to our checklist contract, which contains all the minting limits.
  StrikersChecklist public strikersChecklist;

  /*** FUNCTIONS ***/

  /// @dev For a given owner, returns two arrays. The first contains the IDs of every card owned
  ///   by this address. The second returns the corresponding checklist ID for each of these cards.
  ///   There are a few places we need this info in the web app and short of being able to return an
  ///   actual array of Cards, this is the best solution we could come up with...
  function cardAndChecklistIdsForOwner(address _owner) external view returns (uint256[], uint8[]) {
    uint256[] memory cardIds = ownedTokens[_owner];
    uint256 cardCount = cardIds.length;
    uint8[] memory checklistIds = new uint8[](cardCount);

    for (uint256 i = 0; i < cardCount; i++) {
      uint256 cardId = cardIds[i];
      checklistIds[i] = cards[cardId].checklistId;
    }

    return (cardIds, checklistIds);
  }

  /// @dev An internal method that creates a new card and stores it.
  ///  Emits both a CardMinted and a Transfer event.
  /// @param _checklistId The ID of the checklistItem represented by the card (see Checklist.sol)
  /// @param _owner The card's first owner!
  function _mintCard(
    uint8 _checklistId,
    address _owner
  )
    internal
    returns (uint256)
  {
    uint16 mintLimit = strikersChecklist.limitForChecklistId(_checklistId);
    require(mintLimit == 0 || mintedCountForChecklistId[_checklistId] < mintLimit, "Can't mint any more of this card!");
    uint16 serialNumber = ++mintedCountForChecklistId[_checklistId];
    Card memory newCard = Card({
      mintTime: uint32(now),
      checklistId: _checklistId,
      serialNumber: serialNumber
    });
    uint256 newCardId = cards.push(newCard) - 1;
    emit CardMinted(newCardId);
    _mint(_owner, newCardId);
    return newCardId;
  }
}







/**
 * @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);
    _;
  }

  /**
   * @dev Modifier to make a function callable only when the contract is paused.
   */
  modifier whenPaused() {
    require(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();
  }
}


/// @title The contract that exposes minting functions to the outside world and limits who can call them.
/// @author The CryptoStrikers Team
contract StrikersMinting is StrikersBase, Pausable {

  /// @dev Emit this when we decide to no longer mint a given checklist ID.
  event PulledFromCirculation(uint8 checklistId);

  /// @dev If the value for a checklistId is true, we can no longer mint it.
  mapping (uint8 => bool) public outOfCirculation;

  /// @dev The address of the contract that manages the pack sale.
  address public packSaleAddress;

  /// @dev Only the owner can update the address of the pack sale contract.
  /// @param _address The address of the new StrikersPackSale contract.
  function setPackSaleAddress(address _address) external onlyOwner {
    packSaleAddress = _address;
  }

  /// @dev Allows the contract at packSaleAddress to mint cards.
  /// @param _checklistId The checklist item represented by this new card.
  /// @param _owner The card's first owner!
  /// @return The new card's ID.
  function mintPackSaleCard(uint8 _checklistId, address _owner) external returns (uint256) {
    require(msg.sender == packSaleAddress, "Only the pack sale contract can mint here.");
    require(!outOfCirculation[_checklistId], "Can't mint any more of this checklist item...");
    return _mintCard(_checklistId, _owner);
  }

  /// @dev Allows the owner to mint cards from our Unreleased Set.
  /// @param _checklistId The checklist item represented by this new card. Must be >= 200.
  /// @param _owner The card's first owner!
  function mintUnreleasedCard(uint8 _checklistId, address _owner) external onlyOwner {
    require(_checklistId >= 200, "You can only use this to mint unreleased cards.");
    require(!outOfCirculation[_checklistId], "Can't mint any more of this checklist item...");
    _mintCard(_checklistId, _owner);
  }

  /// @dev Allows the owner or the pack sale contract to prevent an Iconic or Unreleased card from ever being minted again.
  /// @param _checklistId The Iconic or Unreleased card we want to remove from circulation.
  function pullFromCirculation(uint8 _checklistId) external {
    bool ownerOrPackSale = (msg.sender == owner) || (msg.sender == packSaleAddress);
    require(ownerOrPackSale, "Only the owner or pack sale can take checklist items out of circulation.");
    require(_checklistId >= 100, "This function is reserved for Iconics and Unreleased sets.");
    outOfCirculation[_checklistId] = true;
    emit PulledFromCirculation(_checklistId);
  }
}


/// @title StrikersTrading - Allows users to trustlessly trade cards.
/// @author The CryptoStrikers Team
contract StrikersTrading is StrikersMinting {

  /// @dev Emitting this allows us to look up if a trade has been
  ///   successfully filled, by who, and which cards were involved.
  event TradeFilled(
    bytes32 indexed tradeHash,
    address indexed maker,
    uint256 makerCardId,
    address indexed taker,
    uint256 takerCardId
  );

  /// @dev Emitting this allows us to look up if a trade has been cancelled.
  event TradeCancelled(bytes32 indexed tradeHash, address indexed maker);

  /// @dev All the possible states for a trade.
  enum TradeState {
    Valid,
    Filled,
    Cancelled
  }

  /// @dev Mapping of tradeHash => TradeState. Defaults to Valid.
  mapping (bytes32 => TradeState) public tradeStates;

  /// @dev A taker (someone who has received a signed trade hash)
  ///   submits a cardId to this function and, if it satisfies
  ///   the given criteria, the trade is executed.
  /// @param _maker Address of the maker (i.e. trade creator).
  /// @param _makerCardId ID of the card the maker has agreed to give up.
  /// @param _taker The counterparty the maker wishes to trade with (if it's address(0), anybody can fill the trade!)
  /// @param _takerCardOrChecklistId If taker is the 0-address, then this is a checklist ID (e.g. "any Originals John Smith").
  ///                                If not, then it's a card ID (e.g. "Originals John Smith #8/100").
  /// @param _salt A uint256 timestamp to differentiate trades that have otherwise identical params (prevents replay attacks).
  /// @param _submittedCardId The card the taker is using to fill the trade. Must satisfy either the card or checklist ID
  ///                         specified in _takerCardOrChecklistId.
  /// @param _v ECDSA signature parameter v from the tradeHash signed by the maker.
  /// @param _r ECDSA signature parameters r from the tradeHash signed by the maker.
  /// @param _s ECDSA signature parameters s from the tradeHash signed by the maker.
  function fillTrade(
    address _maker,
    uint256 _makerCardId,
    address _taker,
    uint256 _takerCardOrChecklistId,
    uint256 _salt,
    uint256 _submittedCardId,
    uint8 _v,
    bytes32 _r,
    bytes32 _s)
    external
    whenNotPaused
  {
    require(_maker != msg.sender, "You can't fill your own trade.");
    require(_taker == address(0) || _taker == msg.sender, "You are not authorized to fill this trade.");

    if (_taker == address(0)) {
      // This trade is open to the public so we are requesting a checklistItem, rather than a specific card.
      require(cards[_submittedCardId].checklistId == _takerCardOrChecklistId, "The card you submitted is not valid for this trade.");
    } else {
      // We are trading directly with another user and are requesting a specific card.
      require(_submittedCardId == _takerCardOrChecklistId, "The card you submitted is not valid for this trade.");
    }

    bytes32 tradeHash = getTradeHash(
      _maker,
      _makerCardId,
      _taker,
      _takerCardOrChecklistId,
      _salt
    );

    require(tradeStates[tradeHash] == TradeState.Valid, "This trade is no longer valid.");
    require(isValidSignature(_maker, tradeHash, _v, _r, _s), "Invalid signature.");

    tradeStates[tradeHash] = TradeState.Filled;

    // For better UX, we assume that by signing the trade, the maker has given
    // implicit approval for this token to be transferred. This saves us from an
    // extra approval transaction...
    tokenApprovals[_makerCardId] = msg.sender;

    safeTransferFrom(_maker, msg.sender, _makerCardId);
    safeTransferFrom(msg.sender, _maker, _submittedCardId);

    emit TradeFilled(tradeHash, _maker, _makerCardId, msg.sender, _submittedCardId);
  }

  /// @dev Allows the maker to cancel a trade that hasn't been filled yet.
  /// @param _maker Address of the maker (i.e. trade creator).
  /// @param _makerCardId ID of the card the maker has agreed to give up.
  /// @param _taker The counterparty the maker wishes to trade with (if it's address(0), anybody can fill the trade!)
  /// @param _takerCardOrChecklistId If taker is the 0-address, then this is a checklist ID (e.g. "any Lionel Messi").
  ///                                If not, then it's a card ID (e.g. "Lionel Messi #8/100").
  /// @param _salt A uint256 timestamp to differentiate trades that have otherwise identical params (prevents replay attacks).
  function cancelTrade(
    address _maker,
    uint256 _makerCardId,
    address _taker,
    uint256 _takerCardOrChecklistId,
    uint256 _salt)
    external
  {
    require(_maker == msg.sender, "Only the trade creator can cancel this trade.");

    bytes32 tradeHash = getTradeHash(
      _maker,
      _makerCardId,
      _taker,
      _takerCardOrChecklistId,
      _salt
    );

    require(tradeStates[tradeHash] == TradeState.Valid, "This trade has already been cancelled or filled.");
    tradeStates[tradeHash] = TradeState.Cancelled;
    emit TradeCancelled(tradeHash, _maker);
  }

  /// @dev Calculates Keccak-256 hash of a trade with specified parameters.
  /// @param _maker Address of the maker (i.e. trade creator).
  /// @param _makerCardId ID of the card the maker has agreed to give up.
  /// @param _taker The counterparty the maker wishes to trade with (if it's address(0), anybody can fill the trade!)
  /// @param _takerCardOrChecklistId If taker is the 0-address, then this is a checklist ID (e.g. "any Lionel Messi").
  ///                                If not, then it's a card ID (e.g. "Lionel Messi #8/100").
  /// @param _salt A uint256 timestamp to differentiate trades that have otherwise identical params (prevents replay attacks).
  /// @return Keccak-256 hash of trade.
  function getTradeHash(
    address _maker,
    uint256 _makerCardId,
    address _taker,
    uint256 _takerCardOrChecklistId,
    uint256 _salt)
    public
    view
    returns (bytes32)
  {
    // Hashing the contract address prevents a trade from being replayed on any new trade contract we deploy.
    bytes memory packed = abi.encodePacked(this, _maker, _makerCardId, _taker, _takerCardOrChecklistId, _salt);
    return keccak256(packed);
  }

  /// @dev Verifies that a signed trade is valid.
  /// @param _signer Address of signer.
  /// @param _tradeHash Signed Keccak-256 hash.
  /// @param _v ECDSA signature parameter v.
  /// @param _r ECDSA signature parameters r.
  /// @param _s ECDSA signature parameters s.
  /// @return Validity of signature.
  function isValidSignature(
    address _signer,
    bytes32 _tradeHash,
    uint8 _v,
    bytes32 _r,
    bytes32 _s)
    public
    pure
    returns (bool)
  {
    bytes memory packed = abi.encodePacked("\x19Ethereum Signed Message:\n32", _tradeHash);
    return _signer == ecrecover(keccak256(packed), _v, _r, _s);
  }
}


/// @title The main, ERC721-compliant CryptoStrikers contract.
/// @author The CryptoStrikers Team
contract StrikersCore is StrikersTrading {

  /// @dev An external metadata contract that the owner can upgrade.
  StrikersMetadata public strikersMetadata;

  /// @dev We initialize the CryptoStrikers game with an immutable checklist that oversees card rarity.
  constructor(address _checklistAddress) public {
    strikersChecklist = StrikersChecklist(_checklistAddress);
  }

  /// @dev Allows the contract owner to update the metadata contract.
  function setMetadataAddress(address _contractAddress) external onlyOwner {
    strikersMetadata = StrikersMetadata(_contractAddress);
  }

  /// @dev If we've set an external metadata contract, use that.
  function tokenURI(uint256 _tokenId) public view returns (string) {
    if (strikersMetadata == address(0)) {
      return super.tokenURI(_tokenId);
    }

    require(exists(_tokenId), "Card does not exist.");
    return strikersMetadata.tokenURI(_tokenId);
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

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000000000000000000000000dbc260a05f81629ffa062df3d1668a43133abba4

-----Decoded View---------------
Arg [0] : _checklistAddress (address): 0xDBc260a05F81629FfA062Df3d1668A43133AbbA4

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 000000000000000000000000dbc260a05f81629ffa062df3d1668a43133abba4

bzzr://18fd0ecf06cd11ede612e0ec43bd59ac29e2d96ae3b6bd1a7f6f645f054e5307