thumb|The Harp The Harp is a public house at 47 Chandos Place, Covent Garden, London, WC2N 4HS. It was The Welsh Harp until 1995, when it was taken over by an Irish woman Binnie Walsh, who subseq
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 0x4c84bc620d5b1e50dae69d367de2786bf80cf6a1baea4ec48a97335117e28b9d. Chain 2 (Bitcoin): anchored in block 954705 (2026-06-21T13:42:37Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ec736cab-dce4-4fb8-8f88-9c9567245c94.json and https://artists.proofprofile.net/proofs/artist/ec736cab-dce4-4fb8-8f88-9c9567245c94.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).