What is CertNode?
CertNode is cryptographic proof for events that get challenged later. We sign records at the moment they happen so they hold up when someone disputes them or audits them later.
One mechanism, built for disputes first
The cryptographic stack proves what happened. Its primary job is winning chargebacks — the same stack also signs AI output.
Stripe apps for chargeback defense
Three Stripe Marketplace apps that defend chargebacks (Reflex), capture pre-dispute evidence (Vault), and score refund abuse across a cross-merchant network (Sentinel). Install in under a minute, pay only on results.
Commerce solutions →AI Provenance for content authenticity
Cryptographic provenance API for AI output. Sign Claude, OpenAI, Mistral, or any model with three-layer timestamps. Built for EU AI Act Article 50 compliance and FRE 902 admissibility. 100 signings/month free.
AI Provenance →The mechanism: three-layer cryptographic stack
Every CertNode receipt is signed three independent ways. If any one layer is later disputed, the other two still hold.
Signed by CertNode private key. Verifiable against public JWKS without an account.
Independent third-party timestamp from FreeTSA. Verifiable against their CA certificate, no CertNode involvement.
Hash committed to Bitcoin via OpenTimestamps. Once anchored, any alteration is detectable against the Bitcoin block header (header-verified, explorer-backed).
Designed to be self-authenticating
Receipts are designed to satisfy Federal Rule of Evidence 902(13) and 902(14) for self-authenticating digital evidence, and to align with EU AI Act Article 50 requirements for AI content marking (enforces August 2026). The three-layer stack is intentionally over-built so receipts hold up under skeptical examination.
Start defending disputes today.
Installs in under a minute. No monthly fee — you only pay when we win a dispute.