alt=A 17th century painting of various objects, the most prominent of which is a human skull.|thumb|The human skull is used universally as a symbol of death.thumb|alt=Three objects on a slab |A flower
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 0x20df5f85db0dd1e2feb490c683ed5528bf70bc15dbf889548c111f311a44abbd. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3d161f8a-f013-4808-b74f-3bba91021c13.json and https://artists.proofprofile.net/proofs/artist/3d161f8a-f013-4808-b74f-3bba91021c13.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).