Overview of steps needed to unwrap ERC-20s & Chia-side initial transaction model
Unwrapping ERC-20s is initiated by burning wrapped ERC-20 CATs on Chia by building and submitting a spend bundle as depicted above. This operation generates a message coming from a trusted 'CAT Burner' puzzle, which can then be relayed to the destination chain. After the user calls the portal's `receiveMessage` function, the message will be relayed to the `ERC20Bridge` contract (message destination), which will send the equivalent amount of ERC-20 tokens (minus the bridging tip) to the destination address that was specified when bridging was initiated on Chia.
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