thumb|A can of 1,1,1,2-Tetrafluoroethane (Freon 134a) used for recharging vehicle air conditioning Freon ( ) is a registered trademark of Chemours and generic descriptor for a number of halocarbon pro
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 0xe3b2d6e9457ea5c4e29ebc8edec31ed93a44a16f445617f682abf5f03ffba2f7. Chain 2 (Bitcoin): anchored in block 953598 (2026-06-14T06:40:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0cc882ce-257f-4d32-886c-6608a3a36667.json and https://artists.proofprofile.net/proofs/artist/0cc882ce-257f-4d32-886c-6608a3a36667.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).