Every record in the sebbi.pro chain is signed twice: once with ML-DSA-87, the post-quantum signature standard (FIPS 204, NIST's highest level), and once with Ed448, the strongest classical one in RFC 8032. Both must verify. Break one algorithm and the other still holds the evidence. It's live now, on every block, not on a 2030 roadmap.
Blocks dual-signed
up to block 31843
Active policy
version 1
Signed batches
a new batch every 5 minutes
The chain is SHA-256, linked block to block and anchored into Bitcoin. Quantum computers break signatures and key exchange, not hash chains.
Every batch root is signed with ML-DSA-87 and Ed448. A receipt is valid only when both verify under the same policy.
Algorithms are policy, not code. Changing them takes one person to propose and a different person to approve. A new policy can never be weaker, and the whole archive is re-signed so old evidence stays checkable.
"Store now, decrypt later" means stealing encrypted data today and cracking it later. sebbi.pro keeps fingerprints, not your data, so there is nothing to crack.
Enter a block number. Your browser fetches its receipt and the server runs every check below in the open. Then download the receipt and verify it offline with our free verifier.
Download the verifierPublic keysPolicy history
The verifier is one Python file. It needs pip install "cryptography>=50" and never contacts sebbi.pro: python3 sebbi_pq_verify.py receipt.json keys.json
Receipt: GET https://sebbi.pro/quantum/receipt/<block>.json · Check: GET https://sebbi.pro/x/quantum/verify?block=<n> · Keys: https://sebbi.pro/.well-known/sebbi-pq-keys.json · MCP tool sebbi_quantum_receipt at https://sebbi.pro/mcp