thumb|A pneumatic jackhammer thumb|Video: A construction worker uses a jackhammer in Japan. A jackhammer (pneumatic drill or demolition hammer in British English) is a pneumatic or electro-mechanical
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 0x3ae5e629ea1b43324042bf8637d794285ca46f8b5d8e912cf345384d76ee7595. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/81b2f553-14a2-4eca-b121-ac57110bd3e7.json and https://artists.proofprofile.net/proofs/artist/81b2f553-14a2-4eca-b121-ac57110bd3e7.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).