Session creation

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High level flow of the SDK

• Setup websocket client to connect and communicate with the cloud node
• Start a new mpc session
• Perform MPC actions

Create a new Flutter project

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Skip this section if you already have a Flutter project.

Terminal

flutter create silent_mpc

After the project is created, install silent_shard_sdk using the instructions from the Installation Guide

Start a new session

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ECDSA

main.dart

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

const port = 8080;
final nodeUri = Platform.isAndroid ? '10.0.2.2:$port' : '0.0.0.0:$port';
const cloudVerifyingKey = 'SERVER_PUBLIC_KEY_HEX';

final cloudClient = sdk.CloudClient(
  baseUri: nodeUri,
  isSecure: false,
);

final sessionConfig = sdk.SessionConfig(
  cloudClient: cloudClient,
  cloudVerifyingKeyHex: cloudVerifyingKey,
  protocol: sdk.Protocol.trio,
);

final session = sdk.EcdsaSession(sessionConfig);

• Initialize an ECDSA session with the EcdsaSession class.

EdDSA

main.dart

import 'dart:io';
import 'package:silent_shard_sdk/silent_shard_sdk.dart' as sdk;
import 'package:schnorr_sdk/schnorr_sdk.dart' as schnorr;

Future<void> setup() async {
  const port = 8080;
  final nodeUri = Platform.isAndroid ? '10.0.2.2:$port' : '0.0.0.0:$port';
  const cloudVerifyingKey = 'SERVER_PUBLIC_KEY_HEX';

  final cloudClient = sdk.CloudClient(
    baseUri: nodeUri,
    isSecure: false,
  );

  final sessionConfig = sdk.SessionConfig(
    cloudClient: cloudClient,
    cloudVerifyingKeyHex: cloudVerifyingKey,
    protocol: sdk.Protocol.trio,
  );

  await schnorr.init();

  final session = sdk.EddsaSession(sessionConfig);
}

• Initialize an EdDSA session with the EddsaSession class.

• CloudWebSocketClient: is a class that handles the WebSocket communication with the cloud node.

• EcdsaSession: is the class that facilitates all actions for ECDSA wallets.

• EddsaSession: is the class that facilitates all actions for EDDSA wallets.

• SessionConfig: is a configuration object that contains the necessary information for the session.

• nodeUri is the URI of the cloud node.

• cloudVerifyingKeyHex is the hex encoded cloud verifying key (Ed25519 public key).

  • This public key is used to verify the server's signature on each message
  • This key is logged on the server on startup. See example here

• Initialize an ECDSA session with the EcdsaSession class.

You have now successfully set up the session and are ready to start performing MPC actions! 🎉