Check one without us

An attestation is 2,436 bytes: 67 chain values, eight tree siblings, a public seed and a leaf index. Given a root and the message, anyone can decide whether it holds. No account, no wallet, no request to this site.

Scheme unclone/wots-sha256/w16/h8/v1. A root covers 256 one-time keys and a leaf may be used once.