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• library MerkleProof
•    - function verifyProof(bytes _proof, by ...
• 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)
•  contract ERC20Basic
•    - function balanceOf(address who)
•    - function transfer(address to, uint256 ...
•  contract BasicToken is ERC20Basic
•    - function transfer(address _to, uint25 ...
•    - function balanceOf(address _owner)
•  contract ERC20 is ERC20Basic
•    - function allowance(address owner, add ...
•    - function transferFrom(address from, a ...
•    - function approve(address spender, uin ...
•  contract StandardToken is ERC20, B ...
•    - function transferFrom(address _from, ...
•    - function approve(address _spender, ui ...
•    - function allowance(address _owner, ad ...
•    - function increaseApproval(address _sp ...
•    - function decreaseApproval(address _sp ...
•  contract BurnableToken is Standard ...
•    - function burn(uint256 _value)
•  contract DelayedReleaseToken is St ...
•    - function releaseTokens(address destin ...
•  contract UTXORedeemableToken is St ...
•    - function extract(bytes data, uint pos ...
•    - function validateSignature (bytes32 h ...
•    - function ecdsaVerify (address addr, b ...
•    - function pubKeyToEthereumAddress (byt ...
•    - function pubKeyToBitcoinAddress(bytes ...
•    - function verifyProof(bytes proof, byt ...
•    - function canRedeemUTXO(bytes32 txid, ...
•    - function canRedeemUTXOHash(bytes32 me ...
•    - function redeemUTXO (bytes32 txid, ui ...
•  contract WyvernToken is DelayedRel ... *
•    - function WyvernToken (bytes32 merkleR ...

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/**
 *Submitted for verification at Etherscan.io on 2018-01-07
*/

pragma solidity ^0.4.13;

library MerkleProof {
  /*
   * @dev Verifies a Merkle proof proving the existence of a leaf in a Merkle tree. Assumes that each pair of leaves
   * and each pair of pre-images is sorted.
   * @param _proof Merkle proof containing sibling hashes on the branch from the leaf to the root of the Merkle tree
   * @param _root Merkle root
   * @param _leaf Leaf of Merkle tree
   */
  function verifyProof(bytes _proof, bytes32 _root, bytes32 _leaf) public pure returns (bool) {
    // Check if proof length is a multiple of 32
    if (_proof.length % 32 != 0) return false;

    bytes32 proofElement;
    bytes32 computedHash = _leaf;

    for (uint256 i = 32; i <= _proof.length; i += 32) {
      assembly {
        // Load the current element of the proof
        proofElement := mload(add(_proof, i))
      }

      if (computedHash < proofElement) {
        // Hash(current computed hash + current element of the proof)
        computedHash = keccak256(computedHash, proofElement);
      } else {
        // Hash(current element of the proof + current computed hash)
        computedHash = keccak256(proofElement, computedHash);
      }
    }

    // Check if the computed hash (root) is equal to the provided root
    return computedHash == _root;
  }
}

library SafeMath {
  function mul(uint256 a, uint256 b) internal pure returns (uint256) {
    if (a == 0) {
      return 0;
    }
    uint256 c = a * b;
    assert(c / a == b);
    return c;
  }

  function div(uint256 a, uint256 b) internal pure returns (uint256) {
    // assert(b > 0); // Solidity automatically throws when dividing by 0
    uint256 c = a / b;
    // assert(a == b * c + a % b); // There is no case in which this doesn't hold
    return c;
  }

  function sub(uint256 a, uint256 b) internal pure returns (uint256) {
    assert(b <= a);
    return a - b;
  }

  function add(uint256 a, uint256 b) internal pure returns (uint256) {
    uint256 c = a + b;
    assert(c >= a);
    return c;
  }
}

contract ERC20Basic {
  uint256 public totalSupply;
  function balanceOf(address who) public view returns (uint256);
  function transfer(address to, uint256 value) public returns (bool);
  event Transfer(address indexed from, address indexed to, uint256 value);
}

contract BasicToken is ERC20Basic {
  using SafeMath for uint256;

  mapping(address => uint256) balances;

  /**
  * @dev transfer token for a specified address
  * @param _to The address to transfer to.
  * @param _value The amount to be transferred.
  */
  function transfer(address _to, uint256 _value) public returns (bool) {
    require(_to != address(0));
    require(_value <= balances[msg.sender]);

    // SafeMath.sub will throw if there is not enough balance.
    balances[msg.sender] = balances[msg.sender].sub(_value);
    balances[_to] = balances[_to].add(_value);
    Transfer(msg.sender, _to, _value);
    return true;
  }

  /**
  * @dev Gets the balance of the specified address.
  * @param _owner The address to query the the balance of.
  * @return An uint256 representing the amount owned by the passed address.
  */
  function balanceOf(address _owner) public view returns (uint256 balance) {
    return balances[_owner];
  }

}

contract ERC20 is ERC20Basic {
  function allowance(address owner, address spender) public view returns (uint256);
  function transferFrom(address from, address to, uint256 value) public returns (bool);
  function approve(address spender, uint256 value) public returns (bool);
  event Approval(address indexed owner, address indexed spender, uint256 value);
}

contract StandardToken is ERC20, BasicToken {

  mapping (address => mapping (address => uint256)) internal allowed;


  /**
   * @dev Transfer tokens from one address to another
   * @param _from address The address which you want to send tokens from
   * @param _to address The address which you want to transfer to
   * @param _value uint256 the amount of tokens to be transferred
   */
  function transferFrom(address _from, address _to, uint256 _value) public returns (bool) {
    require(_to != address(0));
    require(_value <= balances[_from]);
    require(_value <= allowed[_from][msg.sender]);

    balances[_from] = balances[_from].sub(_value);
    balances[_to] = balances[_to].add(_value);
    allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value);
    Transfer(_from, _to, _value);
    return true;
  }

  /**
   * @dev Approve the passed address to spend the specified amount of tokens on behalf of msg.sender.
   *
   * Beware that changing an allowance with this method brings the risk that someone may use both the old
   * and the new allowance by unfortunate transaction ordering. One possible solution to mitigate this
   * race condition is to first reduce the spender's allowance to 0 and set the desired value afterwards:
   * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
   * @param _spender The address which will spend the funds.
   * @param _value The amount of tokens to be spent.
   */
  function approve(address _spender, uint256 _value) public returns (bool) {
    allowed[msg.sender][_spender] = _value;
    Approval(msg.sender, _spender, _value);
    return true;
  }

  /**
   * @dev Function to check the amount of tokens that an owner allowed to a spender.
   * @param _owner address The address which owns the funds.
   * @param _spender address The address which will spend the funds.
   * @return A uint256 specifying the amount of tokens still available for the spender.
   */
  function allowance(address _owner, address _spender) public view returns (uint256) {
    return allowed[_owner][_spender];
  }

  /**
   * approve should be called when allowed[_spender] == 0. To increment
   * allowed value is better to use this function to avoid 2 calls (and wait until
   * the first transaction is mined)
   * From MonolithDAO Token.sol
   */
  function increaseApproval(address _spender, uint _addedValue) public returns (bool) {
    allowed[msg.sender][_spender] = allowed[msg.sender][_spender].add(_addedValue);
    Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
    return true;
  }

  function decreaseApproval(address _spender, uint _subtractedValue) public returns (bool) {
    uint oldValue = allowed[msg.sender][_spender];
    if (_subtractedValue > oldValue) {
      allowed[msg.sender][_spender] = 0;
    } else {
      allowed[msg.sender][_spender] = oldValue.sub(_subtractedValue);
    }
    Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
    return true;
  }

}

contract BurnableToken is StandardToken {

    event Burn(address indexed burner, uint256 value);

    /**
     * @dev Burns a specific amount of tokens.
     * @param _value The amount of token to be burned.
     */
    function burn(uint256 _value) public {
        require(_value > 0);
        require(_value <= balances[msg.sender]);
        // no need to require value <= totalSupply, since that would imply the
        // sender's balance is greater than the totalSupply, which *should* be an assertion failure

        address burner = msg.sender;
        balances[burner] = balances[burner].sub(_value);
        totalSupply = totalSupply.sub(_value);
        Burn(burner, _value);
    }
}

contract DelayedReleaseToken is StandardToken {

    /* Temporary administrator address, only used for the initial token release, must be initialized by token constructor. */
    address temporaryAdmin;

    /* Whether or not the delayed token release has occurred. */
    bool hasBeenReleased = false;

    /* Number of tokens to be released, must be initialized by token constructor. */
    uint numberOfDelayedTokens;

    /* Event for convenience. */
    event TokensReleased(address destination, uint numberOfTokens);

    /**
     * @dev Release the previously specified amount of tokens to the provided address
     * @param destination Address for which tokens will be released (minted) 
     */
    function releaseTokens(address destination) public {
        require((msg.sender == temporaryAdmin) && (!hasBeenReleased));
        hasBeenReleased = true;
        balances[destination] = numberOfDelayedTokens;
        Transfer(address(0), destination, numberOfDelayedTokens); 
        TokensReleased(destination, numberOfDelayedTokens);
    }

}

contract UTXORedeemableToken is StandardToken {

    /* Root hash of the UTXO Merkle tree, must be initialized by token constructor. */
    bytes32 public rootUTXOMerkleTreeHash;

    /* Redeemed UTXOs. */
    mapping(bytes32 => bool) redeemedUTXOs;

    /* Multiplier - tokens per Satoshi, must be initialized by token constructor. */
    uint public multiplier;

    /* Total tokens redeemed so far. */
    uint public totalRedeemed = 0;

    /* Maximum redeemable tokens, must be initialized by token constructor. */
    uint public maximumRedeemable;

    /* Redemption event, containing all relevant data for later analysis if desired. */
    event UTXORedeemed(bytes32 txid, uint8 outputIndex, uint satoshis, bytes proof, bytes pubKey, uint8 v, bytes32 r, bytes32 s, address indexed redeemer, uint numberOfTokens);

    /**
     * @dev Extract a bytes32 subarray from an arbitrary length bytes array.
     * @param data Bytes array from which to extract the subarray
     * @param pos Starting position from which to copy
     * @return Extracted length 32 byte array
     */
    function extract(bytes data, uint pos) private pure returns (bytes32 result) { 
        for (uint i = 0; i < 32; i++) {
            result ^= (bytes32(0xff00000000000000000000000000000000000000000000000000000000000000) & data[i + pos]) >> (i * 8);
        }
        return result;
    }
    
    /**
     * @dev Validate that a provided ECSDA signature was signed by the specified address
     * @param hash Hash of signed data
     * @param v v parameter of ECDSA signature
     * @param r r parameter of ECDSA signature
     * @param s s parameter of ECDSA signature
     * @param expected Address claiming to have created this signature
     * @return Whether or not the signature was valid
     */
    function validateSignature (bytes32 hash, uint8 v, bytes32 r, bytes32 s, address expected) public pure returns (bool) {
        return ecrecover(hash, v, r, s) == expected;
    }

    /**
     * @dev Validate that the hash of a provided address was signed by the ECDSA public key associated with the specified Ethereum address
     * @param addr Address signed
     * @param pubKey Uncompressed ECDSA public key claiming to have created this signature
     * @param v v parameter of ECDSA signature
     * @param r r parameter of ECDSA signature
     * @param s s parameter of ECDSA signature
     * @return Whether or not the signature was valid
     */
    function ecdsaVerify (address addr, bytes pubKey, uint8 v, bytes32 r, bytes32 s) public pure returns (bool) {
        return validateSignature(sha256(addr), v, r, s, pubKeyToEthereumAddress(pubKey));
    }

    /**
     * @dev Convert an uncompressed ECDSA public key into an Ethereum address
     * @param pubKey Uncompressed ECDSA public key to convert
     * @return Ethereum address generated from the ECDSA public key
     */
    function pubKeyToEthereumAddress (bytes pubKey) public pure returns (address) {
        return address(uint(keccak256(pubKey)) & 0x000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF);
    }

    /**
     * @dev Calculate the Bitcoin-style address associated with an ECDSA public key
     * @param pubKey ECDSA public key to convert
     * @param isCompressed Whether or not the Bitcoin address was generated from a compressed key
     * @return Raw Bitcoin address (no base58-check encoding)
     */
    function pubKeyToBitcoinAddress(bytes pubKey, bool isCompressed) public pure returns (bytes20) {
        /* Helpful references:
           - https://en.bitcoin.it/wiki/Technical_background_of_version_1_Bitcoin_addresses 
           - https://github.com/cryptocoinjs/ecurve/blob/master/lib/point.js
        */

        /* x coordinate - first 32 bytes of public key */
        uint x = uint(extract(pubKey, 0));
        /* y coordinate - second 32 bytes of public key */
        uint y = uint(extract(pubKey, 32)); 
        uint8 startingByte;
        if (isCompressed) {
            /* Hash the compressed public key format. */
            startingByte = y % 2 == 0 ? 0x02 : 0x03;
            return ripemd160(sha256(startingByte, x));
        } else {
            /* Hash the uncompressed public key format. */
            startingByte = 0x04;
            return ripemd160(sha256(startingByte, x, y));
        }
    }

    /**
     * @dev Verify a Merkle proof using the UTXO Merkle tree
     * @param proof Generated Merkle tree proof
     * @param merkleLeafHash Hash asserted to be present in the Merkle tree
     * @return Whether or not the proof is valid
     */
    function verifyProof(bytes proof, bytes32 merkleLeafHash) public constant returns (bool) {
        return MerkleProof.verifyProof(proof, rootUTXOMerkleTreeHash, merkleLeafHash);
    }

    /**
     * @dev Convenience helper function to check if a UTXO can be redeemed
     * @param txid Transaction hash
     * @param originalAddress Raw Bitcoin address (no base58-check encoding)
     * @param outputIndex Output index of UTXO
     * @param satoshis Amount of UTXO in satoshis
     * @param proof Merkle tree proof
     * @return Whether or not the UTXO can be redeemed
     */
    function canRedeemUTXO(bytes32 txid, bytes20 originalAddress, uint8 outputIndex, uint satoshis, bytes proof) public constant returns (bool) {
        /* Calculate the hash of the Merkle leaf associated with this UTXO. */
        bytes32 merkleLeafHash = keccak256(txid, originalAddress, outputIndex, satoshis);
    
        /* Verify the proof. */
        return canRedeemUTXOHash(merkleLeafHash, proof);
    }
      
    /**
     * @dev Verify that a UTXO with the specified Merkle leaf hash can be redeemed
     * @param merkleLeafHash Merkle tree hash of the UTXO to be checked
     * @param proof Merkle tree proof
     * @return Whether or not the UTXO with the specified hash can be redeemed
     */
    function canRedeemUTXOHash(bytes32 merkleLeafHash, bytes proof) public constant returns (bool) {
        /* Check that the UTXO has not yet been redeemed and that it exists in the Merkle tree. */
        return((redeemedUTXOs[merkleLeafHash] == false) && verifyProof(proof, merkleLeafHash));
    }

    /**
     * @dev Redeem a UTXO, crediting a proportional amount of tokens (if valid) to the sending address
     * @param txid Transaction hash
     * @param outputIndex Output index of the UTXO
     * @param satoshis Amount of UTXO in satoshis
     * @param proof Merkle tree proof
     * @param pubKey Uncompressed ECDSA public key to which the UTXO was sent
     * @param isCompressed Whether the Bitcoin address was generated from a compressed public key
     * @param v v parameter of ECDSA signature
     * @param r r parameter of ECDSA signature
     * @param s s parameter of ECDSA signature
     * @return The number of tokens redeemed, if successful
     */
    function redeemUTXO (bytes32 txid, uint8 outputIndex, uint satoshis, bytes proof, bytes pubKey, bool isCompressed, uint8 v, bytes32 r, bytes32 s) public returns (uint tokensRedeemed) {

        /* Calculate original Bitcoin-style address associated with the provided public key. */
        bytes20 originalAddress = pubKeyToBitcoinAddress(pubKey, isCompressed);

        /* Calculate the UTXO Merkle leaf hash. */
        bytes32 merkleLeafHash = keccak256(txid, originalAddress, outputIndex, satoshis);

        /* Verify that the UTXO can be redeemed. */
        require(canRedeemUTXOHash(merkleLeafHash, proof));

        /* Claimant must sign the Ethereum address to which they wish to remit the redeemed tokens. */
        require(ecdsaVerify(msg.sender, pubKey, v, r, s));

        /* Mark the UTXO as redeemed. */
        redeemedUTXOs[merkleLeafHash] = true;

        /* Calculate the redeemed tokens. */
        tokensRedeemed = SafeMath.mul(satoshis, multiplier);

        /* Track total redeemed tokens. */
        totalRedeemed = SafeMath.add(totalRedeemed, tokensRedeemed);

        /* Sanity check. */
        require(totalRedeemed <= maximumRedeemable);

        /* Credit the redeemer. */ 
        balances[msg.sender] = SafeMath.add(balances[msg.sender], tokensRedeemed);

        /* Mark the transfer event. */
        Transfer(address(0), msg.sender, tokensRedeemed);

        /* Mark the UTXO redemption event. */
        UTXORedeemed(txid, outputIndex, satoshis, proof, pubKey, v, r, s, msg.sender, tokensRedeemed);
        
        /* Return the number of tokens redeemed. */
        return tokensRedeemed;

    }

}

contract WyvernToken is DelayedReleaseToken, UTXORedeemableToken, BurnableToken {

    uint constant public decimals     = 18;
    string constant public name       = "Project Wyvern Token";
    string constant public symbol     = "WYV";

    /* Amount of tokens per Wyvern. */
    uint constant public MULTIPLIER       = 1;

    /* Constant for conversion from satoshis to tokens. */
    uint constant public SATS_TO_TOKENS   = MULTIPLIER * (10 ** decimals) / (10 ** 8);

    /* Total mint amount, in tokens (will be reached when all UTXOs are redeemed). */
    uint constant public MINT_AMOUNT      = 2000000 * MULTIPLIER * (10 ** decimals);

    /**
      * @dev Initialize the Wyvern token
      * @param merkleRoot Merkle tree root of the UTXO set
      * @param totalUtxoAmount Total satoshis of the UTXO set
      */
    function WyvernToken (bytes32 merkleRoot, uint totalUtxoAmount) public {
        /* Total number of tokens that can be redeemed from UTXOs. */
        uint utxoTokens = SATS_TO_TOKENS * totalUtxoAmount;

        /* Configure DelayedReleaseToken. */
        temporaryAdmin = msg.sender;
        numberOfDelayedTokens = MINT_AMOUNT - utxoTokens;

        /* Configure UTXORedeemableToken. */
        rootUTXOMerkleTreeHash = merkleRoot;
        totalSupply = MINT_AMOUNT;
        maximumRedeemable = utxoTokens;
        multiplier = SATS_TO_TOKENS;
    }

}

• No Contract Security Audit Submitted- Submit Audit Here

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bfdda2cdd0ddffbde454c05ba311161075f0baa7ee43681b8cd44669883ba4450000000000000000000000000000000000000000000000000000a92519f20ed2

-----Decoded View---------------
Arg [0] : merkleRoot (bytes32): 0xbfdda2cdd0ddffbde454c05ba311161075f0baa7ee43681b8cd44669883ba445
Arg [1] : totalUtxoAmount (uint256): 185976814178002

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : bfdda2cdd0ddffbde454c05ba311161075f0baa7ee43681b8cd44669883ba445
Arg [1] : 0000000000000000000000000000000000000000000000000000a92519f20ed2

MerkleProof : 0xcc3bf5a8e925f7b70238eda8dbe51b2a5ea8ae2c

bzzr://993b0602a8a20d6ec31e355ba41211525d085bd607717cf30adcef404a7c0c08