---
title: Transaction simulation and validation
description: Transaction Simulation allows users to review transaction outcomes before they’re approved or submitted to the blockchain, reducing the risk of signing without full visibility.
---

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# Transaction simulation and validation

| Available for all **io.vault** subscriptions. |
| --- |

 

**Transaction Simulation** allows users to review transaction outcomes before they’re approved or submitted to the blockchain. This reduces the risk of signing without full visibility and ensures transparency for all users in the transaction approval process. Using BlockAid’s Simulation API, it mirrors the blockchain’s current state for accurate, reliable results. Additionally, the system automatically scans for suspicious dApps and addresses, providing risk alerts to users during the approval process.

#### **How does it work?**

By integrating BlockAid into io.vault, we provide the enhanced security needed to operate confidently on the blockchain. With real-time insights into transaction details—including amounts, gas fee estimations, and potential smart contract errors when interacting with defi applications — users can better understand their operations. If a suspicious transaction or address is detected, a clear warning message will be displayed on the dashboard before submission.

For an **added layer of protection**, when the transaction is submitted for approval to the relevant Vault’s Signing Party all devices will be able to view the simulation results (and any risk related warnings), allowing users to approve or reject the transaction with direct transparency of the expected result.

Currently, the transaction simulation feature does not support the following chains:

- Tron
- Fantom
- Bitcoin
- Bitcoin Testnet

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