TIL CryptoPunks ownership is an internal mapping

mapping (uint => address) public punkIndexToAddress;

Most docs state CryptoPunks are an ERC-20 token

However, the contract only implements balanceOf(). If they were a true ERC-20 token, the owner of each punk would be untrackable onchain

Instead, there is this function:

transferPunk(address to, uint punkIndex)

This ensures the owner mapping of a punk remains consistent onchain, when transferred - pre interesting !

Curious about the intersection of humans & technology | Obsessed with @gnosispay & /invaders | henrypye.xyz

pre interesting that the concept ERC-721 didn't even exist prior to the punks release. the punks release inspired it, and the crypto kitties popularised the term

it's a proto 721 :) "colored coin" where the coins are not fungible