Below, your browser downloads Crovia’s real, signed ledger seal and checks its Ed25519 signature locally, on your device. No Crovia server takes part in the check — the cryptography runs in the page you are reading. If the signature is valid, it proves Crovia’s signing key attested to this exact ledger state, and that not one of its records can be altered without breaking the seal.
This is the same check anyone can run offline with the open-source tool
(python3 -m collectors.substrate_seal verify). The seal covers the entire
append-only ledger: each new seal re-attests every prior record, so any retroactive edit
would break this and every later signature. The signed Merkle root is periodically anchored
to the Bitcoin blockchain via OpenTimestamps for independent, third-party dating.