thumb|upright=1.3|Skyline of Lower Manhattan in 2021. The term "Skyline" was first used for New York City in 1896. A skyline is the outline or shape viewed near the horizon. It can be created by a cit
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 0xca948b46a9cf1d929406e1863eea5132d32c4a42c0bf06d18d3fe12bbc906cea. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/72cb0e6f-914a-4746-8d8b-8c2fb8df67ee.json and https://artists.proofprofile.net/proofs/artist/72cb0e6f-914a-4746-8d8b-8c2fb8df67ee.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).