public static boolean isDefault(final SignatureAlgorithm signatureAlgorithm) {
    return signatureAlgorithm.getCurveName().equals(DEFAULT_EC_CURVE_NAME);
  }
Is default signature algorithm.

@param signatureAlgorithm the signature algorithm
@return the boolean
crypto/algorithms/src/main/java/org/hyperledger/besu/crypto/SignatureAlgorithmType.java