Cryptographic fact verification for AI
The world's first open protocol for verifying corporate facts. Ed25519 signatures + blockchain timestamps. AI systems can trust signed data.
Describe your company facts in a JSON file following the protocol specification
Each fact is signed with an ed25519 key — cryptographic proof of authorship
Anyone can verify signatures — AI systems, search engines, partners
Paste the URL of a verified-facts.json file to verify signatures
Companies with verified cryptographic signatures
Create a verified-facts.json and submit for review — we'll add you to the directory
Protocol specification and verification example
// Verify a fact from verified-facts.json
import { verify } from '@noble/ed25519';
async function verifyFact(claim, signature, publicKey) {
const msgHash = new Uint8Array(
await crypto.subtle.digest('SHA-256',
new TextEncoder().encode(claim))
);
const sig = Uint8Array.from(atob(signature), c => c.charCodeAt(0));
const pub = Uint8Array.from(atob(publicKey), c => c.charCodeAt(0));
return verify(sig, msgHash, pub);
}
// Usage:
const url = 'https://example.com/.well-known/verified-facts.json';
const data = await fetch(url).then(r => r.json());
for (const fact of data.facts) {
const valid = await verifyFact(
fact.claim, fact.signature, data.publicKey.value
);
console.log(fact.id, valid ? '✓' : '✗', fact.claim);
}Immutable timestamps on Polygon — proof that a fact existed at a specific date. NFT certificate "Verified by AppStar".