@Override
  public DSAKCalculator getKCalculator() {
    return new HMacDSAKCalculator(new SHA256Digest());
  }
SECP256K1 is using the deterministic implementation of K calculation (defined on RFC 6979
section 3.2)

@return an instance of HMacDSAKCalculator
@see <a href="https://datatracker.ietf.org/doc/html/rfc6979#section-3.2">RFC 6979 Section
    3.2</a>
crypto/algorithms/src/main/java/org/hyperledger/besu/crypto/SECP256K1.java