thumb|right|upright=1.5|Gregory's categorization of illusions thumb|In this animation, Mach bands exaggerate the contrast between edges of the slightly differing shades of gray as soon as they come in
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 0x9705d340251bd671fafbb7a02fb43b35e511ee3277743d96a0aba6d47ee4b4f0. Chain 2 (Bitcoin): anchored in block 954015 (2026-06-16T22:55:46Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/352319cb-01bd-429f-a4e6-671d1d742f60.json and https://artists.proofprofile.net/proofs/artist/352319cb-01bd-429f-a4e6-671d1d742f60.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).