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This guide demonstrates how to integrate Sodot’s secure Multi-Party Computation (MPC) technology with the Adamik API, based on our live demo application. By following this implementation, you can leverage a single MPC infrastructure to sign transactions across all Adamik-supported blockchains.

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Overview

The sodot-multichain demo showcases how Sodot MPC technology can be combined with Adamik API to:
  • Generate cryptographic keys securely using MPC across multiple parties
  • Sign transactions for 60+ blockchains without exposing private keys
  • Provide institutional-grade security for blockchain operations
The complete source code for this implementation is available in our GitHub repository.

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Implementation Architecture

The integration consists of three main components:
  1. Sodot MPC Signer: Handles key generation and transaction signing
  2. Adamik API Client: Manages blockchain interactions (encoding addresses, preparing and broadcasting transactions)
  3. Application Logic: Connects these components in a seamless workflow

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Implementing the Sodot Signer

The core of the integration is the SodotSigner class, which implements the BaseSigner interface: 
// Based on src/signers/types.ts
export interface BaseSigner {
  signerSpec: AdamikSignerSpec;
  signerName: string;
  chainId: string;

  getPubkey(): Promise<string>;
  signTransaction(encodedMessage: string): Promise<string>;
}
Here’s a simplified implementation based on our demo application: 
// Based on src/signers/Sodot.ts
export class SodotSigner implements BaseSigner {
  public chainId: string;
  public signerSpec: AdamikSignerSpec;
  public signerName = "SODOT";

  private SODOT_VERTICES = [
    "https://sodot-vertex-1.example.com",
    "https://sodot-vertex-2.example.com",
    "https://sodot-vertex-3.example.com",
  ];

  private n = 3; // Number of parties
  private t = 2; // Threshold (minimum parties needed)
  private keyIds: string[] = [];

  constructor(chainId: string, signerSpec: AdamikSignerSpec) {
    this.chainId = chainId;
    this.signerSpec = signerSpec;
  }

  // Check if Sodot configuration is valid
  static isConfigValid(): boolean {
    // Verify environment variables and configuration
    return true; // Simplified for this example
  }

  // Get or generate public key
  public async getPubkey(): Promise<string> {
    // If keys don't exist, generate them
    if (this.keyIds.length === 0) {
      await this.keygenVertex(
        this.adamikCurveToSodotCurve(this.signerSpec.curve)
      );
    }

    // Derive public key using the first vertex
    const pubkeyResponse = await this.derivePubkeyWithVertex(
      0,
      this.keyIds[0],
      [44, Number(this.signerSpec.coinType), 0, 0, 0],
      this.adamikCurveToSodotCurve(this.signerSpec.curve)
    );

    return pubkeyResponse.pubkey;
  }

  // Sign a transaction
  public async signTransaction(encodedMessage: string): Promise<string> {
    // Determine hash method based on chain
    const hashMethod = this.adamikHashFunctionToSodotHashMethod(
      this.signerSpec.hashFunction,
      this.signerSpec.curve
    );

    // Sign the transaction
    const signature = await this.sign(
      encodedMessage,
      this.keyIds,
      [44, Number(this.signerSpec.coinType), 0, 0, 0],
      this.signerSpec.curve,
      hashMethod
    );

    return signature;
  }

  // Helper methods (simplified)
  private adamikCurveToSodotCurve(
    adamikCurve: AdamikCurve
  ): "ecdsa" | "ed25519" {
    return adamikCurve === AdamikCurve.SECP256K1 ? "ecdsa" : "ed25519";
  }

  private adamikHashFunctionToSodotHashMethod(
    hashAlgo: AdamikHashFunction,
    curve: AdamikCurve
  ): "sha256" | "keccak256" | undefined {
    // Map Adamik hash functions to Sodot hash methods
    if (hashAlgo === AdamikHashFunction.SHA256) return "sha256";
    if (hashAlgo === AdamikHashFunction.KECCAK256) return "keccak256";
    return undefined;
  }

  // Additional methods for key generation, signing, etc.
  // See the full implementation in the GitHub repository
}

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Integration Workflow

The demo application follows this workflow:
  1. Initialize the Signer: Create a SodotSigner instance for the selected blockchain
  2. Generate Public Key: Call getPubkey() to generate or retrieve the MPC key
  3. Encode Address: Use Adamik API to convert the public key to a blockchain address
  4. Prepare Transaction: Use Adamik API to encode a transaction
  5. Sign Transaction: Use the SodotSigner to sign the encoded transaction
  6. Broadcast Transaction: Send the signed transaction to the network via Adamik API
Here’s how this workflow is implemented in the demo application: 
// Example from src/utils/terminalCommands.tsx (simplified)
async function executeChainSelection(chainId: string) {
  // Get chain information from Adamik API
  const chain = await adamikGetChain(chainId);

  // Create SodotSigner instance
  const signer = new SodotSigner(chainId, chain.signerSpec);

  // Generate public key
  const pubkey = await signer.getPubkey();

  // Convert public key to address using Adamik API
  const { address } = await encodePubKeyToAddress(pubkey, chainId);

  // Store for later use
  workflowState.selectedChain = chainId;
  workflowState.pubkey = pubkey;
  workflowState.address = address;

  return { success: true, address, pubkey };
}

async function executeSignTransaction() {
  const { selectedChain, encodedTransaction } = workflowState;

  // Recreate signer with the same chain and signer spec
  const chain = await adamikGetChain(selectedChain);
  const signer = new SodotSigner(selectedChain, chain.signerSpec);

  // Sign the transaction
  const signature = await signer.signTransaction(encodedTransaction);

  // Store signature for broadcasting
  workflowState.signature = signature;

  return { success: true, signature };
}

async function executeBroadcastTransaction() {
  const { selectedChain, encodedTransaction, signature } = workflowState;

  // Broadcast the transaction using Adamik API
  const result = await broadcastTransaction(
    selectedChain,
    encodedTransaction,
    signature
  );

  // Store transaction hash
  workflowState.txHash = result.hash;

  return { success: true, hash: result.hash };
}

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Adamik API Integration

The demo application uses a set of utility functions to interact with the Adamik API. These functions are located in the src/adamik directory:
  • encodePubkeyToAddress.ts: Converts a public key to a blockchain address
  • encodeTransaction.ts: Prepares a transaction for signing
  • broadcastTransaction.ts: Broadcasts a signed transaction to the network
These functions handle the API calls, error handling, and logging, making it easy to integrate with the Sodot MPC signer.

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Security Considerations

This demo application uses the Sodot Demo API for demonstration purposes only. For production deployments, it is critical to:
  1. Use Official Sodot Setup: Always work with Sodot through official channels to set up your production MPC infrastructure
  2. Never Use Demo API in Production: The Demo API is for testing and educational purposes only
  3. Follow Security Best Practices:
    • Distributed Key Generation: Keys are generated across multiple parties (vertices)
    • Threshold Signing: Requires multiple parties to collaborate for signing
    • No Private Key Exposure: Private key material is never combined or exposed
    • API Logging: All API calls are logged for audit purposes

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Testing the Integration

You can test this integration by:
  1. Visiting the live demo
  2. Cloning the GitHub repository
  3. Setting up your own environment with Sodot MPC and Adamik API

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Conclusion

The integration of Sodot MPC with Adamik API provides a powerful solution for secure multi-chain applications. By following the implementation in our demo application, you can leverage this integration to build your own secure blockchain applications. For more details, explore the full source code in our GitHub repository, particularly the src/signers/Sodot.ts file for the MPC implementation and the src/adamik directory for the API integration.
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