private static String getEcCurvesListAsString() {
    Iterator<Map.Entry<String, Supplier<SignatureAlgorithm>>> it =
        SUPPORTED_ALGORITHMS.entrySet().iterator();

    StringBuilder ecCurveListBuilder = new StringBuilder();
    ecCurveListBuilder.append("[");

    while (it.hasNext()) {
      ecCurveListBuilder.append(it.next().getKey());

      if (it.hasNext()) {
        ecCurveListBuilder.append(", ");
      }
    }
    ecCurveListBuilder.append("]");

    return ecCurveListBuilder.toString();
  }
Is default signature algorithm.

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