thumb|Langacre Rhyne near West End, North Somerset. alt=Olveston Drainage Rhine near Pilning, South Gloucestershire|thumb|Olveston Drainage Rhine near Pilning, South Gloucestershire. A rhyne (Somerset
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 0x2bc4051160704277436f18fbe4f95948b4906e6efc6bbaafe141e2028f76f9df. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/dff488ea-6291-44ff-b6a3-c6b57201c935.json and https://artists.proofprofile.net/proofs/artist/dff488ea-6291-44ff-b6a3-c6b57201c935.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).