thumb|Rubber mallets thumb|A wooden mallet thumb|Rawhide mallet thumb|Stonemason's mallets of plastic, wood and steel thumb|An iron mallet with copper faces. Solid head copper mallets are produced wit
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 0x1af0f301273f45cc42a1a013d0061ab2f230f339a215462b67af9c18766aa845. Chain 2 (Bitcoin): anchored in block 954346 (2026-06-19T03:51:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9aa2c83e-7a2b-41b7-acfc-77b761a7c30d.json and https://artists.proofprofile.net/proofs/artist/9aa2c83e-7a2b-41b7-acfc-77b761a7c30d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).