# Cryptographic Action Attestor MCP for AI Agents MCP

> Cryptographic Action Attestor creates a permanent, unchangeable record of everything your agent does. It uses SHA-256 hashing to link every action to the one before it, making it impossible to alter history without detection. If you are running autonomous workflows that need strict accountability or a verifiable audit trail, this is how you prove what actually happened and when.

## Overview
- **Category:** security
- **Price:** Free
- **Endpoint:** https://edge.vinkius.com/vk_preview_eptrqhU3rW1f8B3b4S05LGDksKEimylFIeGLQkDW/mcp
- **Tags:** sha256, tamper-proof, audit-log, provenance, integrity

## Description

Building autonomous agents is easy until they start doing things you didn't expect. Once an agent has the power to move money, delete files, or send emails, trust isn't a security strategy. You need a way to look back at a sequence of events and know for a fact that the logs haven't been scrubbed or manipulated after the fact. This MCP acts as a digital notary for your agent's behavior. Every time an action occurs, it gets cryptographically locked into an append-only ledger. Because each entry is tied to the previous one via a hash, any attempt to change a past record breaks the entire chain. It turns a standard log file into a verifiable history of provenance. You can connect this directly to your existing workflows through the Vinkius catalog and immediately start building systems that are auditable by design. Instead of manually checking logs or trying to reconstruct events from fragmented data, you have a single source of truth that proves the integrity of every step taken by your agent.

## Tools

### attest_action
Records an event by computing a SHA-256 hash and appending it to the log. This creates a permanent, tamper-proof audit trail for any specific action.

### get_audit_log_status
Checks the current integrity and total size of your audit log. Use this to quickly verify that no part of your history has been altered.

## Prompt Examples

**Prompt:** 
```
Did anything change in the logs recently?
```

**Response:** 
```
| Timestamp | Action ID | Status |
| :--- | :--- | :--- |
| 14:05:22 | act_98234 | **Valid** |
| 14:02:10 | act_98233 | **Valid** |

All recent entries show consistent integrity.
```

**Prompt:** 
```
Verify that our recent actions are still valid.
```

**Response:** 
```
The audit log integrity is **valid**. 

*   **Total Entries:** 12
*   **Last Verified:** 2026-07-22 20:47 UTC
*   **Status:** No tampering detected.
```

**Prompt:** 
```
Log a new event for the system update at 10:00 AM.
```

**Response:** 
```
Action recorded successfully.

*   **Action ID:** act_98235
*   **Hash:** `5e884898da28047151d0e56f8dc6292773603d0d6aabbdd62a11ef721d9ac6ca`
*   **Integrity Valid:** true
```

## Capabilities

### Lock in action history
Creates an unchangeable record of all agent events.

### Verify log integrity
Checks if any past entries were modified or deleted.

### undefined
undefined

### undefined
undefined

### undefined
undefined

## Use Cases

### Auditing Financial Transactions
An agent processes a payment, and you need an unchangeable record to prove the amount and recipient were never altered.

### Verifying Code Deployments
Your CI/CD agent executes a deployment, and this MCP provides the cryptographic proof that the deployment parameters match the original request.

### Monitoring Sensitive File Access
When an agent reads or writes to a secure database, every access event is permanently etched into the ledger for later review.

### Tracking Automated Email Campaigns
Ensure that every email sent by your marketing agent is logged with a timestamp that cannot be retroactively changed.

## Benefits

- Eliminate tampering concerns by using SHA-256 hashing to link every action.
- Gain instant proof of event sequence with an append-only ledger structure.
- Automate compliance reporting by maintaining a verifiable history of all agent activities.
- Detect unauthorized modifications immediately when checking the status of your logs.
- Build trust in autonomous systems by providing clear evidence of action provenance.

## How It Works

The bottom line is you get a verifiable, tamper-proof history of every autonomous decision.

1. Connect your preferred client to the MCP via Vinkius.
2. Configure your agent to trigger a recording whenever a sensitive tool is used.
3. Run integrity checks whenever you need to audit past performance or security.

## Frequently Asked Questions

**How does Cryptographic Action Attestor protect my logs?**
It uses SHA-256 hashing to link every new entry to the previous one. This creates a chain where any modification to an old record breaks the entire sequence, making tampering easy to spot.

**Can I use Cryptographic Action Attestor with Claude or Cursor?**
Yes. Since it follows the Model Context Protocol, you can connect it to any compatible client like Claude, Cursor, or Windsurf through Vinkius.

**Is the Cryptographic Action Attestor ledger permanent?**
The ledger is append-only, meaning once an action is recorded, it cannot be removed or changed without invalidating the audit trail. This provides a permanent history of events.

**How do I detect tampering using Cryptographic Action Attestor?**
You can run a status check on your logs at any time. If anyone has attempted to alter the history, the integrity check will fail and alert you to the discrepancy.

**Does Cryptographic Action Attestor support multiple agents?**
Yes. You can use a single instance of this MCP to create a centralized, unified audit trail for all your different autonomous agents and workflows.

**How does the server ensure the log hasn't been tampered with?**
The server uses SHA-256 hashing to create a cryptographic fingerprint for every action. When you call `get_audit_log_status`, the system recomputes all hashes in the log and compares them against the stored values to detect any unauthorized changes.

**What information is recorded during an attestation?**
The `attest_action` tool records the name of the tool used, the specific parameters passed to it, and a Unix timestamp.

**Can I see previous actions in the log?**
Yes, you can use the history retrieval tools to view the sequence of recorded events in the ledger.