Key Recovery

Please refer to the Session creation section to learn how to create a new session.

Full example:

ECDSA

main.dart

import 'package:silent_shard_sdk/silent_shard_sdk.dart' as sdk;

Future<void> recovery(sdk.EcdsaSession session) async {
  // Creating a new keyshare for demo purpose. In real application, you can use an existing keyshare.
  final keyshare = await session.keygen();
  print('Keyshare created, public key: ${keyshare.publicKeyHex}');

  final recoveredKeyshare =
      await session.recovery(publicKey: keyshare.publicKeyHex);
  print('Recovered keyshare, public key: ${recoveredKeyshare.publicKeyHex}');
}

EdDSA

main.dart

import 'package:silent_shard_sdk/silent_shard_sdk.dart' as sdk;

Future<void> recovery(sdk.EddsaSession session) async {
  // Creating a new keyshare for demo purpose. In real application, you can use an existing keyshare.
  final keyshare = await session.keygen();

  final recoveredKeyshare =
      await session.recovery(publicKey: await keyshare.publicKeyHex);
  print('Recovered keyshare: ${await recoveredKeyshare.publicKeyHex}');
}

• When session.recovery(keyshare_public_key) is called, the app and the server exchange message to "recover" the MPC wallet. Refer to Key Recovery for more details.
• publicKeyHex is the public key of the client's share of the MPC wallet to be recovered.
• This process enhances the long-term security of the MPC wallet by proactively updating the client's and server's secret shares.
• The wallet's public address or key remains unchanged during this process.
• The recoveredKeyshare object is of type DklsKeyshare and represents the client's new share of the MPC wallet.