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For signing serialized transaction it needs make sha256 one time, but EOS returns signature longer than 64 symbols. My question is - what is additional info added to the signature?

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A transaction signature is formed of a SIG_ prefix, a part that defines which curve algorithm was used to create the signature e.g; K1 or R1, and the base58 encoded SHA256 hash. e.g; SIG_K1_{base58_hash}

A signature being constructed in swift - https://github.com/memtrip/eos-swift/blob/master/eosswift/eos-core/encode/Base58.swift#L19

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