Sellat

Prove what existed, when it existed.

Sellat helps individuals, businesses, developers, and AI agents create independent, cryptographically verifiable proof of digital content.

Your files are hashed locally using SHA-256, so you can create proof without uploading the original content.

Proofs are anchored to Polygon and Bitcoin through OpenTimestamps, with optional qualified eIDAS timestamps for stronger legal recognition in the EU.

What makes Sellat different?

• No file upload required

• Independently verifiable evidence

• Free blockchain-based proofs

• API and MCP integration for developers and AI agents

• Pay-per-use access via x402, starting at $0.01 per proof

Built to bring verifiable trust to an increasingly AI-driven digital world.