Digital Signature & Hash Validation

Published on 30 June 2025 • Updated on 2 July 2025

Digital Signature & Hash Validation

Every tool, agent definition, and prompt flow should be cryptographically signed before being loaded into an MCP server. This prevents tampering, forgery, and supply chain poisoning.

Key Mechanisms:

• SHA-256 or SHA3-512 for file hashing
• Ed25519 or RSA-4096 for digital signatures
• JSON-LD signatures for metadata payloads

Technical Workflow:

[Tool Authoring] --> Hash artifact --> Sign with private key --> Publish to registry
                          |
                  [MCP Server Boot] --> Verify signature using public key --> Accept or Reject

Bonus:

Implement version locking via tool_hashlock.json to prevent mid-flight updates.