Wrapped CryptoKitties (WCK)
Convert Cryptokitties between the ERC721 standard and the ERC20 standard by locking cryptokitties into the contract and minting 1:1 backed ERC20 tokens, that can then be redeemed for cryptokitties when desired. The token entitles you to receive *a* cryptokitty in return, not necessarily the *same* cryptokitty in return. A different user can submit their own WCK tokens to the contract and withdraw the kitty that you originally deposited. WCK tokens have no information about which kitty was originally deposited to mint WCK - this is due to the very nature of the ERC20 standard being fungible, and the ERC721 standard being nonfungible.