Authenticated Transaction Feature

Overview

The Authenticated Transaction feature in Tachyon API enables cross-chain transaction signing using NEAR Protocol's Chain Signatures technology. When a transaction is submitted with isAuthenticatedTx: true, Tachyon leverages NEAR's Multi-Party Computation (MPC) service to sign transactions for external blockchains while maintaining security and decentralization.

How It Works

Transaction Flow

1. Transaction Submission: A user submits a transaction with isAuthenticatedTx: true
2. Transaction Type Assignment: The transaction is automatically classified as TransactionType.AUTHENTICATED
3. Chain Signature Process:
   • The transaction is prepared for signing on the target blockchain
   • NEAR's Chain Signature contract (v1.signer) is invoked
   • The MPC service generates signatures using the specified derivation path
4. Funding Transaction: The newly derived address is funded with the required amount of native tokens for gas fees
5. Transaction Finalization: The signed transaction is broadcast to the target blockchain

Supported Blockchains

Chain Signatures work with any blockchain that uses ECDSA signatures, including:

• Ethereum and EVM-compatible networks
• Solana
• Aptos
• Sui

Security Features

• Decentralized Signing: No single entity controls the signing process
• Multi-Party Computation: Signatures are generated by multiple independent nodes
• Derivation Path Security: Each user gets unique derived addresses per blockchain
• On-Chain Verification: All signature requests are processed on NEAR blockchain

Usage Example

Submitting an Authenticated Transaction

const transactionData = {
  to: "0x1234567890abcdef1234567890abcdef12345678",
  callData: "0x",
  value: "1", // 1 Wei in wei
  chainId: 1, // Ethereum mainnet
  isAuthenticatedTx: true, // Enable Chain Signatures
  maxFeePerGas: "20000000000",
  maxPriorityFeePerGas: "2000000000",
  gasLimit: "21000",
  userId: "your-user-id",
  label: "default"
};

const response = await fetch('/submit-tx', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
    'api-key': 'your-api-key'
  },
  body: JSON.stringify(transactionData)
});

Benefits

1. Unified Key Management: Control multiple blockchain accounts from a single Tachyon account
2. Enhanced Security: Leverage NEAR's decentralized MPC infrastructure
3. Cross-Chain Interoperability: Sign transactions for any ECDSA-compatible blockchain
4. Simplified Integration: Single API call handles complex multi-chain operations
5. Cost Efficiency: Batch multiple signatures in a single MPC request

Limitations

• Requires Tachyon account and availability of Rath Services
• Dependent on NEAR network availability and MPC service uptime

For more information about NEAR Chain Signatures, see the official NEAR documentation.