I am currently working with Ethereum Signatures (ECDSA and r, s ,v values) and I'm looking for official information about the recovery id v.

A few posts like this one explain how the calculation is done and I've already achieved to calculate this id. Now I wanted to find some official documentation on this, but unfortunately I couldn't find anything on how to calculate this. I know that it was taken over mostly from bitcoin but they have some more flags (compressed / uncompressed public key) which are not used on Ethereum.

Any help to find some source would be greatly appreciated!

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