thumb|Tito Schipa (photo with dedication from 1943) right|thumb|Tito Schipa Tito Schipa () (27 December 1888 – 16 December 1965) was an Italian tenor. Biography thumb|Tito Schipa in 1920 with a cam
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 0xc8d5482134f3e5e20185a2cef4f8bd9f11b7baa70ade3c8ee885d34544eaa99b. 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/3b534d56-6b6d-4272-8f8a-2fab1f424faa.json and https://artists.proofprofile.net/proofs/artist/3b534d56-6b6d-4272-8f8a-2fab1f424faa.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).