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One line in your code, and every model answer comes with a link. Anyone who opens it can see the answer was not changed.
Change the AI answer after it was sealed. The record on Solana stays the same, so the certificate shows the change at once.
Genuine
The answer has not changed since sealing · 1 October 2026, 12:04
Model answer
Risk: 72 of 100. Clause 4.2 lets the supplier change the price unilaterally.Each record stores the fingerprint of the one before it. Quietly deleting or replacing a record breaks the chain, and the history check shows where.
Name a key for your service. Copy it once and store it in PROOFAPI_API_KEY on your server.
Get an API keyThe proofapi package on npm. Install it in your server application, not in the browser.
QuickstartUse the response from your existing AI provider. ProofAPI records it; it doesn't generate another answer.
Try the PlaygroundOpenAI, Gemini, OpenRouter or your own model: call seal() after receiving the result. These are integration examples, not installed provider plugins.
Record the input and output of an agent decision.
Return a verification link together with an AI result.
Keep evidence for later integrity checks outside your application.
Send only locally computed SHA-256 fingerprints. Keep the original bytes and salt so you can prove the content later.
Read the API guideEverything is free during the beta. These are the plans after it.
Planned plans after beta
$49/ month
By request
No. Just open the site.
Anyone with the certificate link can view the result and download the evidence file, including the document. Only fingerprints go on-chain. In hash-only mode your content stays with you.
In the public Solana blockchain. Once written, it can't be changed or deleted, even by ProofAPI.
No. It proves the answer hasn't changed since it was sealed.
It's free during the beta.
Questions, pilots or partnerships: email proofapiofficial@gmail.com and we'll reply.