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Code on the Blockchain - Electronic Contract Scripts

Inside the Wrapped Punk (WPUNKS) Blockchain Contract / Service

Turn classic unique punks into "standardized" non-fungible tokens

How? Non-fungible Tokens (ERC721 on Ethereum) each backed 1:1 by a CryptoPunk

Source Code

Etherscan

Overview

The WrappedPunk contract script is about 1 800 lines total.

Interfaces (Ethereum Standards and Optional Extensions) used / supported:

interface IERC721             // ERC-721 compliant contract
interface IERC721Enumerable   // ERC-721 Non-Fungible Token Standard, optional enumeration extension
interface IERC721Receiver     // ERC-721 token receiver interface
interface IERC721Metadata     // ERC-721 Non-Fungible Token Standard, optional metadata extension

interface IERC165             //  declare support of contract interfaces, which can then be queried by others

Libraries (re)used:

library SafeMath
library Counters
library Address
library Strings

The contract outline & inheritance for the WrappedPunk contract:

contract Context

contract ERC165 is IERC165
contract ERC721 is Context, ERC165, IERC721  //  ERC721 Non-Fungible Token Standard basic
   using SafeMath
   using Address
   using Counters

contract ERC721Enumerable is ERC721, IERC721Enumerable //  ERC-721 Non-Fungible Token with optional enumeration extension logic
contract ERC721Metadata is ERC721, IERC721Metadata
   using Strings

contract ERC721Full is ERC721Enumerable, ERC721Metadata  // Full ERC721 Token

contract Ownable is Context
contract Pausable is Context

contract UserProxy
contract WrappedPunk is Ownable, ERC721Full, Pausable

And CryptoPunksMarket contract functions called (via the "imported" external functions in ICryptoPunk):

interface ICryptoPunk {
  function punkIndexToAddress(uint256 punkIndex) returns (address);
  function punksOfferedForSale(uint256 punkIndex) returns (bool, uint256, address, uint256, address);
  function buyPunk(uint punkIndex) payable;
  function transferPunk(address to, uint punkIndex);
}

WrappedPunk

Constants

The metadata details about the "Wrapped Cryptopunks" WPUNKS ERC721 non-fungible token.

string private _name   = "Wrapped Cryptopunks";  // Token name
string private _symbol = "WPUNKS";               // Token symbol

Events

ProxyRegistered

event ProxyRegistered(address user, address proxy);

Storage

proxies

Mapping from user address to proxy address

mapping(address => address) private _proxies;

Functions

registerProxy

Registers proxy for user

function registerProxy()

mint

Mints a wrapped punk

function mint(
  uint256 punkIndex
)

burn

Burns a specific wrapped punk

function burn(
  uint256 punkIndex
)

(Source: WrappedPunk.sol)