thumb|Giulio Setti in 1918 Giulio Setti (born Treviglio, October 3, 1869 - died Turin, October 2, 1938) was an Italian choral conductor. Biography He served as chorus master of opera houses in Italy,
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 0xbd9caa67d6ee01e216aa4b126b7a6adeb259efee554358e93d87aa321ecfc0c8. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ca68c4d7-5a2f-4f72-894c-71f372aa84fb.json and https://artists.proofprofile.net/proofs/artist/ca68c4d7-5a2f-4f72-894c-71f372aa84fb.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
The Beniamino Gigli Collection, Vol. 5: True Belcanto in Opera and Songs (Recordings 1927-1949) [2014 Digital Remaster]