thumb|Baku Street at Noon (1861) by Alexey Bogolyubov, depicting shadows from the sun at its highest point over the city of Baku Noon (also known as noontime or midday) is 12 o'clock in the daytime.
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 0x75dfa795d7ddc502f045ca0665f050ef6e31fe0206041770f02fb328092dbe6c. Chain 2 (Bitcoin): anchored in block 953727 (2026-06-15T02:33:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9200c45a-af61-46a0-8d7f-b5f65cc6f1da.json and https://artists.proofprofile.net/proofs/artist/9200c45a-af61-46a0-8d7f-b5f65cc6f1da.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).