thumb|St. Macdara’s Island Mac Dara was a sixth century Irish Christian saint who lived on an island off the west coast of Ireland. His feast day is September 28; the (Feast of Macdara) occurs on Ju
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 0xe0b9d97d8bcca27016f6ea1e86e3c711a88afa863946051ec02bbaf98e6c4c1a. Chain 2 (Bitcoin): anchored in block 954728 (2026-06-21T18:08:38Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fc7d3364-a01f-45d1-8712-3dcb1761e4b8.json and https://artists.proofprofile.net/proofs/artist/fc7d3364-a01f-45d1-8712-3dcb1761e4b8.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).