Nothing special here, I'm just playing around with Solidity + Hardhat.

The following contracts (and associated libs) were copied from the ERC6551 reference repo:

• ERC6551Registry
• SimpleERC6551Account

Just a standard ERC721. Dudes get minted with a name.

Exposes swapTokens(addr1, addr2, token1, token2), which allows us to swap tokens between 2 contracts in 1 transaction. This is needed because of the next contract. Inherits from openzeppelin's ERC721 implementation.

Limits the number of tokens that can be owned by a single account. Though I don't see real value brought by this limitation, it can be used to impose rules on game-specific tokens. Inherits from ERC721TokenSwapper, which allows us to swap tokens without needing a third account.

A special ERC721 composed with ERC721TokenSwapper & ERC721LimitPerOwner(1). An account can only hold at max 1 Hat. How special these are! Better pick your one and only favourite hat to wear.

Token Bound Account meant for DudeTokens. Inherits from SimpleERC6551Account & ERC721Holder. The latter allows for minting directly to the account.

The core of the Token Bound Account functionality is tested in the scenarios laid on in test/DudeAccount.ts.

Install dependencies using npm (or yarn).

Compile contracts with npx hardhat compile.

Run unit tests with npx hardhat test.

Deploy to a test network with npx hardhat run scripts/deploy.js. If you don't want to mess with deploying to a third party testnet, just run your own with npx hardhat node.