thumb|Vanitas (Latin for vanity) by Léon Bazille Perrault, 1886 Vanity is the excessive belief in one's own abilities or attractiveness compared to others. Prior to the 14th century, it did not have
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8ba1aa90fa8cc8fd07535ca309a657c5b1bdb287da3c44a8bf5580a594f54bf. Chain 2 (Bitcoin): anchored in block 954513 (2026-06-20T06:31:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9dac760b-2ffe-4f3f-8908-53c1d2275e34.json and https://artists.proofprofile.net/proofs/artist/9dac760b-2ffe-4f3f-8908-53c1d2275e34.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).