thumb|Ivory label bearing the serekh of Pharaoh Hor-Aha. It reports the victory over the "arch-using Setjet-folks" (center) and the visit at the domain "Horus thrives with the cattles" (right). The Se
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 0xa64e699a2dc6b54d4a3e8d7e1000567050ec8944a174de26a9c1cce054bfd351. Chain 2 (Bitcoin): anchored in block 953770 (2026-06-15T09:50:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/bb3e5949-b898-46ea-ba1c-d00ccfcc8254.json and https://artists.proofprofile.net/proofs/artist/bb3e5949-b898-46ea-ba1c-d00ccfcc8254.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).