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What hash function does EOS use for creating a block. Is it SHA-256?

In addition, what procedure for signing a transaction is used? RSA?

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Block producers use SHA-256 to generate the digest and ECDSA to sign the block. Producers may sign using a K1 key (secp256k1 curve, used by Bitcoin) or an R1 key (P-256 curve, a NIST standard). Likewise, users may use K1 or R1 keys to sign transactions.

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Signatures are produced using EC-DSA.

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