Sign AI outputs with cryptographic provenance
Three-layer timestamp chain (CertNode + RFC 3161 + Bitcoin OpenTimestamps). Designed for FRE 902(13)/(14) self-authenticating digital evidence and EU AI Act Article 50 disclosure. Multi-model. 100 receipts/month free.
Sign your first AI output in 60 seconds — no install, no setup. Pre-filled test key, editable sample, instant receipt.
10 lines of code to sign your first AI output from a route handler.
10 lines of Python to sign AI outputs via requests.
Native fetch + production tips (test mode, idempotency, cap handling).
The three-layer timestamp chain, content hashing, JWS signatures, prompt-hash binding, FRE 902(13)/(14) framing.
Endpoint-by-endpoint reference. Sign, verify, search, keys, billing, webhooks.
How CertNode receipts map to regulatory framings — what we claim, what we don't, what your counsel needs to know.
Working code for real patterns: Claude tool-calls, streaming, RAG, privacy-preserving prompts, verify-before-serve, historical backfill.
Coming from Adobe CAI, C2PA-only, Truepic, or AI detection? Migration patterns + comparison.
Common errors, debugging steps, rate-limit handling, free-tier-cap recovery.
Need something not documented?
Email contact@certnode.io with the integration pattern you're trying to ship and we'll either point you to an existing surface or write up the recipe.