A signed Defence-AI System Card you can verify yourself

Issue your own signed card

Paste any JSON (your real system-card fields) and sign it with the sovereign key. It stays here — the payload is signed and returned; nothing is stored.

How to verify — for anyone, no crypto background needed

A signature proves two things at once: who issued the card (the sovereign key) and that not one character has been changed since. You never have to trust us — you check it yourself, even offline, even years later.

1. Easiest: click “Verify this card offline” above. Green = authentic & untampered. Then try the tamper test — one changed byte turns it red.
2. Independently: send the card's message, signature and publicKey to /api/verify (or any Ed25519 verifier). It answers valid / invalid — no account.
3. Fully offline / your own tooling: Ed25519 is an open standard. Any library (Node, Python, Go, openssl) verifies it with the public key alone. Example:

// Node — verify with nothing but the public key
import crypto from 'crypto';
const pub = crypto.createPublicKey({ key: Buffer.from(publicKey,'hex'), format:'der', type:'spki' });
const ok = crypto.verify(null, Buffer.from(message), pub, Buffer.from(signature,'hex'));
console.log(ok ? 'AUTHENTIC & UNTAMPERED' : 'REJECT');

That's the whole point: assurance you can re-check without us, forever. Post-quantum (ML-DSA-65) is added by the SOV33 substrate for long-term archival.