thumb|Nicola Zaccaria in Rigoletto, Teatro alla Scala, Milan, lyric season 1933-1934 (photo with 1953 dedication) Nicola Zaccaria (9 March 1923 – 24 July 2007), born Nicholas Angelos Zachariou was a G
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 0xdd9bee5288c5dffd134795ec4503a6996ec05c1ccf72775d0131c3e3b11aeb8a. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6b133bb5-8c59-461f-8cac-5333829d812b.json and https://artists.proofprofile.net/proofs/artist/6b133bb5-8c59-461f-8cac-5333829d812b.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Pelléas et Mélisande live 1962 Herbert von Karajan
Pavarotti – The Opera Collection 1: Bellini: I Capuleti e I Montecchi (Live in Amsterdam, 1966)
I Capuleti e i Montecchi: Eccomi in lieta vesta: Sinfonia - Live in Amsterdam, 1966
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 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 0xa20ffe227eff6ffb90d2303f6cc6830b2d9fca6fc58d83eb64faa558fb103556. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF071240501 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75264097f4afdfad4a71f15ed5c8d684b9c3213c6205ece3a8e698928dd1b08e. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US89R0699354 — a six-check JSON result.
Verdi: La Traviata: Un di, felice, eterea - Act One
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c633a87fc3c2e493198161a174ca4427abe15d333deb3b71b6c7ee894c9ed68. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US89R0699358 — a six-check JSON result.
Verdi: Un ballo in maschera, Act 1: "Posa in pace, a’ bei sogni ristora" (Coro, Samuel, Tom)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e0f9a39b8e622c75965571627efa6b913b3e145e0447a9603b0002da7b95b71. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC1401189 — a six-check JSON result.
Verdi: Un ballo in maschera, Act 1: "La rivedrà nell’estasi" (Riccardo, Oscar, Coro, Samuel, Tom)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b081880bb3db82f5c177c3ddd3cd22b86728f5e97c104de3fd8e9c449a809fd. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC1401192 — a six-check JSON result.
Verdi: Un ballo in maschera, Act 1: "Volta la terrea" (Oscar, Riccardo, Giudice, Renato, Samuel, Tom, Coro)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42177bff9948b034942f6e6ee1e9297fcdd2a4c0dbc4bb54006c0a5313f38b9a. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC1401196 — a six-check JSON result.
Verdi: Un ballo in maschera, Act 1: "Ogni cura si doni al diletto" (Riccardo, Renato, Oscar, Samuel, Tom, Coro)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e43714979ac6d40b74b86d21b881a9c9071fd28d89a313946610ddb74ab4b0c. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC1401197 — a six-check JSON result.
Verdi: La Traviata: Libiamo ne'lieti calici - Act One
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52138e2631eb3a9726d0af87d095496bd942a93d1509531708cc00ebfaf732cb. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US89R0699356 — a six-check JSON result.
Verdi: Un ballo in maschera, Act 1: "È scherzo od è follia" (Riccardo, Ulrica, Samuel, Tom, Oscar, Coro)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1d1b83b4409d470514c7b4bc167437836c64df9db5d29213899d7285be4c4ef. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC1401209 — a six-check JSON result.
Verdi: Un ballo in maschera, Act 1: "Finisci il vaticinio" (Riccardo, Ulrica, Coro, Samuel, Tom, Silvano, Oscar, Renato)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5276df6e350eaab50cdb6bfdbc590b3f23e785a3a8ac4bf1c49a9b1fcd507480. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC1401210 — a six-check JSON result.
Verdi: Un ballo in maschera, Act 2: "Seguitemi" (Renato, Amelia, Coro, Samuel, Tom)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc38904f0fd443a1a58ce54189157af12dacc7410ab972e82ed7f8c9872f2dad7. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC1401221 — a six-check JSON result.
Verdi: Un ballo in maschera, Act 2: "Ve', se di notte qui colla sposa" (Renato, Amelia, Coro, Samuel, Tom)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b7be3b7147989c2dc3ba99833827712a0cdf487339f67b10c58977732169ba2. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC1401222 — a six-check JSON result.
Norma, Act II Scene 3: Qual cor tradisti, qual cor perdesti (Coro/Norma/Pollione/Oroveso)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbaca2373d8b914833a5c54a61d371cdf3375b26d084e7cab3a81b1cd1909fd55. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC9701154 — a six-check JSON result.
Coro dell'Accademia Nazionale Di Santa Cecilia
Orchestra dell'Accademia Nazionale di Santa Cecilia
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea61d05f287f5213cfb8ae661f7254fdaaa95ee893179681ffb09b13c5b2ac9e. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF075540707 — a six-check JSON result.