thumb|upright=1.5|Cueva de las Manos, Perito Moreno, Argentina. The art in the cave is dated between 7,300 BC and 700 AD; stenciled, mostly left hands are shown. In archaeology, cave paintings are a t
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 0x60da80ea56ec1ec99fc44dae429a53df4ed1906ae38e6817842592ec8f424e51. Chain 2 (Bitcoin): anchored in block 954346 (2026-06-19T03:51:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9312752a-9098-4d89-be59-d715f488bc3f.json and https://artists.proofprofile.net/proofs/artist/9312752a-9098-4d89-be59-d715f488bc3f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).