signToEcSignature method
Implementation
MsgSignature signToEcSignature(Uint8List hash) {
final sig = crypto.Secp256k1.sign(hash, privateKey);
final r = BigInt.parse(HexUtils.encode(sig.sublist(0, 32)), radix: 16);
final s = BigInt.parse(HexUtils.encode(sig.sublist(32, 64)), radix: 16);
final v = sig[64];
return MsgSignature(r, s, v);
}