Also covering Signmessage and BIP322

Generic signmessage is a method that allows wallets to sign or partially sign a message for any script from which they could conceivably spend.

The BIP322 generic signed message format allows a wallet to sign a text string by producing a signature for a virtual Bitcoin transaction. This means a signed message can be produced for any script or address that a wallet would be able to spend. Additionally, two or more wallets can cooperate to create a BIP322 signed message for multisig scripts.

When signing for legacy P2PKH addresses, BIP322 instead uses the traditional signmessage format that was first implemented in an early version of the Bitcoin software, making the proposal backwards compatible with existing software that verifies signed messages for P2PKH addresses.

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