thumb|right|upright=1.35|Landers, California at nautical dusk (20-second exposure) Dusk occurs at the darkest stage of twilight, or at the very end of astronomical twilight after sunset and just befo
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 0x8bfb21e1ef93c7b519f7c193dd75e969b32ce43f1d8780565e3ff372abad43bb. 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/3f1a912e-3e8c-4edd-ba49-42eba6da3b19.json and https://artists.proofprofile.net/proofs/artist/3f1a912e-3e8c-4edd-ba49-42eba6da3b19.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).