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5/12/2026
Ghost Signature: Cryptographic Receipts for AI Output (Ed25519 + JWKS)

Ghost Signature: Cryptographic Receipts for AI Output (Ed25519 + JWKS)

Short summary

A developer built a cryptographic signature API that lets AI agents prove output authenticity via Ed25519—verifiable without trusting any platform. Instead of detecting AI-generated text, this timestamps and signs it at generation time for provenance proof. Free 20/month, paid tiers up to $99/month for 250K signatures.

  • •Built a cryptographic signature API (Ed25519) for AI agent outputs—verifiable by anyone, no platform trust required
  • •Three endpoints: /sign (private), /verify (public), /jwks (key rotation); soft revocation preserves historical audit trail
  • •Free tier 20/month, Pro $29/month 50K, Ultra $99/month 250K; use cases include AI journalism, agent-to-agent trust, compliance

Generated with AI, which can make mistakes.

#product-launch#ai-tools#ai-agents#regulation-policy
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