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 0x80ba9e3dbac3704623967cbd4b638d3600f68bee0e2ff2bfc11d125b68edf5b7. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8ff64256-9965-4c0c-b627-d5b52406790f.json and https://artists.proofprofile.net/proofs/artist/8ff64256-9965-4c0c-b627-d5b52406790f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Verdi: Rigoletto (Bjorling, Sayao, Warren) (1945)
Flotow: Martha (Sung in English) [Recorded 1961]
CARUSO, Enrico: Complete Recordings, Vol. 9 (1914-1916)
La traviata, Act I: Libiamo, ne'lieti calici, "Brindisi"
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 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. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd99cefc979deb912b3a0bc9872243f618beb94afca26d1283dc65079712feae7. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI190310901.
Il mito dell'opera: Giuseppe Valdengo (Recorded 1948-1964)
Wagner: Tristan und Isolde, WWV 90 (Recorded 1960)
Gounod: Faust (Bjorling, Siepi, Kirsten) (1950)
Debussy: Pelleas Et Melisande (Singher, Sayao, Kipnis) (1945)
Strauss, R.: Rosenkavalier (Der) (Lehmann / Stevens) (1939)
Strauss, R.: Salome (Goltz, Patzak, Krauss) (1954)
Wagner, R.: Fliegende Holländer (Der) (Hotter, Varnay) (1950)
Donizetti: Elisir D'Amore (L') (Metropolitan Opera) (1949)
Puccini: Manon Lescaut (Kirsten, Björling) (1949)
Verdi: Traviata (La) (Metropolitan Opera) (1949)
Michael Bohnen At The Metropolitan Opera
Hanson : Merry Mount (Tibbett, Swarthout) (1934)
The Beniamino Gigli Collection, Vol. 4 (Verismo Arias & Scenes) [Remastered 2014]
Verdi: Aida (Milanov, Bjorling, Perlea) (1955)
Tourel, Jennie: Vocal Portrait (A) (1946-1952)
Il mito dell'opera: Eugene Conley (Live)
Gigli, Beniamino: Gigli Edition, Vol. 5: New York Recordings (1927-1928)