Key Refresh

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

Using the session object and an existing keyshare, we can easily refresh it to generate a new keyshare.

Full example:

ECDSA

main.dart

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

Future<void> refresh(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();

  final refreshedKeyshare = await session.refresh(keyshare: keyshare);
  print('Refreshed keyshare: ${refreshedKeyshare.publicKeyHex}');
}

EdDSA

main.dart

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

Future<void> refresh(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 refreshedKeyshare = await session.refresh(keyshare: keyshare);
  print('Refreshed keyshare: ${await refreshedKeyshare.publicKeyHex()}');
}

• When session.refresh(keyshare) is called, the app and the server exchange messages to "refresh" the MPC wallet. Refer to Key Refresh for more details.
• 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 refreshedKeyshare object is of type EDSA Keyshare or EdDSA Keyshare and represents the client's new share of the MPC wallet.