thumb|300px|Le Moustier Neanderthals (Charles R. Knight, 1920) The caveman is a stock character representative of primitive humans in the Paleolithic. The popularization of the type dates to the early
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a109d3d4655ba4485fc50eefd71b8378834d6b12e71a93ab1603829aece4cd0. Chain 2 (Bitcoin): anchored in block 953928 (2026-06-16T10:21:55Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1d537777-8054-48b9-811e-4250249f19e4.json and https://artists.proofprofile.net/proofs/artist/1d537777-8054-48b9-811e-4250249f19e4.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).