Thumbscrew can mean: Thumbscrew (torture), a screwed device formerly used for torture Thumbscrew (fastener), a type of screw with a tall head and ridged or knurled sides, or a flat vertical head, inte
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e791023020d466c29bd6515a614bfb45f5d78519147e9a77a90f8862ea64d40. Chain 2 (Bitcoin): anchored in block 953648 (2026-06-14T15:20:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4456e223-6463-4246-8be5-7377df18ad47.json and https://artists.proofprofile.net/proofs/artist/4456e223-6463-4246-8be5-7377df18ad47.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).