Verify a record without trusting us

Paste the blob_sha256 from a certificate, or a day (YYYY-MM-DD). Every step below can be repeated on your own machine.

How it works: each snapshot's SHA-256 is written to an append-only ledger. Every day's ledger slice is hashed and anchored to Bitcoin with OpenTimestamps at 00:30 UTC (plus an RFC 3161 timestamp). Verification uses the files you download here, public tools, and the public Bitcoin chain. Nothing depends on this server being honest.