What block hash function and transaction signature method does EOS use?

Question

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?

Answer 1

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.

Answer 2

Signatures are produced using EC-DSA.