The TAC SDK provides sophisticated tracking capabilities to monitor cross-chain transactions from initiation to completion. Whether you need simple status updates or detailed execution profiling, the tracking system offers multiple approaches to fit your application’s needs.
Transaction tracking is essential for providing good user experience in cross-chain applications. Always implement appropriate error handling and retry logic to handle network issues gracefully.

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Overview of Transaction Tracking

Cross-chain transactions go through multiple stages across different blockchain networks. The TAC SDK’s tracking system provides real-time visibility into this complex process through several interfaces:
  • TransactionLinker: Initial tracking handle returned from transaction submission
  • OperationTracker: Comprehensive tracking with detailed status information
  • Simplified Tracking: Helper functions for common tracking scenarios
  • Stage Profiling: Detailed execution timeline for advanced monitoring

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Basic Tracking with TransactionLinker

Every cross-chain transaction returns a TransactionLinker object that serves as the primary tracking handle: 
// Send transaction and get tracking handle
const transactionLinker = await tacSdk.sendCrossChainTransaction(
  evmProxyMsg,
  sender,
  assets
);

// Operation ID may not be immediately available
// Use OperationTracker to retrieve it
console.log("Shard Key:", transactionLinker.shardsKey);
console.log("Timestamp:", transactionLinker.timestamp);
console.log("Caller:", transactionLinker.caller);

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TransactionLinker Properties

interface TransactionLinker {
  caller: string; // Sender's wallet address
  shardCount: number; // Number of shards involved
  shardsKey: string; // Unique shard identifier
  timestamp: number; // Transaction timestamp
  operationId?: string; // Operation ID (available after processing)
  sendTransactionResult?: any; // Raw transaction result
}

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OperationTracker Class

The OperationTracker provides comprehensive tracking capabilities with multiple monitoring methods: 
import { OperationTracker, Network } from "@tonappchain/sdk";

// Initialize tracker
const tracker = new OperationTracker(Network.TESTNET);

// Get operation status
const status = await tracker.getOperationStatus(operationId);
console.log("Transaction status:", status);

​
Simplified Status Tracking

For applications that need basic status information: 
const getSimpleStatus = async (transactionLinker) => {
  const tracker = new OperationTracker(Network.TESTNET);

  const status = await tracker.getSimplifiedOperationStatus(transactionLinker);

  switch (status) {
    case "PENDING":
      console.log("Transaction is being processed");
      break;
    case "SUCCESSFUL":
      console.log("Transaction completed successfully");
      break;
    case "FAILED":
      console.log("Transaction failed");
      break;
    case "OPERATION_ID_NOT_FOUND":
      console.log("Operation not found - may still be propagating");
      break;
  }

  return status;
};

​
Detailed Status Information

For applications requiring comprehensive status data: 
const getDetailedStatus = async (operationId) => {
  const tracker = new OperationTracker(Network.TESTNET);

  const statusInfo = await tracker.getOperationStatus(operationId);

  console.log("Status Information:");
  console.log("- Stage:", statusInfo.stage);
  console.log("- Success:", statusInfo.success);
  console.log("- Success:", statusInfo.success);
  console.log("- Timestamp:", statusInfo.timestamp);
  console.log("- Transactions:", statusInfo.transactions);

  return statusInfo;
};

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Automated Tracking Functions

The SDK provides utility functions for automated tracking with built-in polling and table display:

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Single Transaction Tracking

import { startTracking } from "@tonappchain/sdk";

// Track with console output (default)
await startTracking(transactionLinker, Network.TESTNET);

// Track and return results
const executionStages = await startTracking(
  transactionLinker,
  Network.TESTNET,
  {
    returnValue: true,
    tableView: false,
    delay: 5000, // Poll every 5 seconds
    maxIterationCount: 60, // Maximum 60 iterations (5 minutes)
  }
);

console.log("Final execution stages:", executionStages);

​
Multiple Transaction Tracking

import { startTrackingMultiple } from "@tonappchain/sdk";

// Track multiple transactions simultaneously
const transactionLinkers = [linker1, linker2, linker3];

await startTrackingMultiple(transactionLinkers, Network.TESTNET, {
  tableView: true,
  delay: 10000, // Poll every 10 seconds
  maxIterationCount: 30, // Maximum 30 iterations
});

​
Stage Profiling

For detailed execution analysis, use stage profiling to understand exactly where time is spent: 
const getExecutionProfiling = async (operationId) => {
  const tracker = new OperationTracker(Network.TESTNET);

  const stages = await tracker.getStageProfiling(operationId);

  console.log("Execution Timeline:");
  console.log("- TON Transaction Sent:", stages.tonTransactionSent);
  console.log("- Message Validated:", stages.messageValidated);
  console.log("- Assets Locked:", stages.assetsLocked);
  console.log("- Cross-Chain Routed:", stages.crossChainRouted);
  console.log("- EVM Execution Started:", stages.evmExecutionStarted);
  console.log("- EVM Execution Completed:", stages.evmExecutionCompleted);
  console.log("- Final Confirmation:", stages.finalConfirmation);

  // Calculate durations
  const totalTime = stages.finalConfirmation - stages.tonTransactionSent;
  const evmExecutionTime =
    stages.evmExecutionCompleted - stages.evmExecutionStarted;

  console.log(`Total execution time: ${totalTime / 1000} seconds`);
  console.log(`EVM execution time: ${evmExecutionTime / 1000} seconds`);

  return stages;
};

​
Batch Tracking

Track multiple transactions efficiently: 
const trackMultipleTransactions = async (operationIds) => {
  const tracker = new OperationTracker(Network.TESTNET);

  // Get statuses in batch (more efficient than individual calls)
  const statuses = await tracker.getOperationStatuses(operationIds);

  const results = {};
  for (const [operationId, statusInfo] of Object.entries(statuses)) {
    results[operationId] = {
      status: statusInfo.operationType,
      success: statusInfo.success,
      error: statusInfo.error,
    };
  }

  return results;
};

// Usage
const operationIds = ["op1", "op2", "op3"];
const batchResults = await trackMultipleTransactions(operationIds);

Object.entries(batchResults).forEach(([id, result]) => {
  console.log(`Operation ${id}: ${result.status}`);
});

​
Error Handling in Tracking

Handle tracking errors gracefully: 
const robustTracking = async (transactionLinker, maxRetries = 3) => {
  const tracker = new OperationTracker(Network.TESTNET);
  let retries = 0;

  while (retries < maxRetries) {
    try {
      const status = await tracker.getSimplifiedOperationStatus(
        transactionLinker
      );

      if (status === "OPERATION_ID_NOT_FOUND" && retries < maxRetries - 1) {
        console.log(`Operation not found, retry ${retries + 1}/${maxRetries}`);
        await new Promise((resolve) => setTimeout(resolve, 15000));
        retries++;
        continue;
      }

      return status;
    } catch (error) {
      console.error(`Tracking attempt ${retries + 1} failed:`, error);
      retries++;

      if (retries >= maxRetries) {
        throw new Error(
          `Tracking failed after ${maxRetries} attempts: ${error.message}`
        );
      }

      await new Promise((resolve) => setTimeout(resolve, 10000));
    }
  }
};

​
Transaction States and Types

Understanding transaction states helps with proper status handling: 
enum OperationType {
  PENDING = 'PENDING',           // Transaction being processed
  TON_TAC_TON = 'TON-TAC-TON',  // Round-trip transaction
  ROLLBACK = 'ROLLBACK',         // Transaction rolled back
  TON_TAC = 'TON-TAC',          // One-way to TAC
  TAC_TON = 'TAC-TON',          // Return to TON
  UNKNOWN = 'UNKNOWN'            // Unknown state
}