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 0x28a33c380928893b7dfec87d17e6b5e3cb94ea0a93108c9424e12d9470a37a33. Chain 2 (Bitcoin): anchored in block 954008 (2026-06-16T21:31:27Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/32d0ee9a-8b43-47e9-bf5c-56cef012af7c.json and https://artists.proofprofile.net/proofs/artist/32d0ee9a-8b43-47e9-bf5c-56cef012af7c.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
La Traviata, Act I: Brindisi - "Libiamo ne' lieti calici" (Instrumental Version)
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 0x9166d106b6bf020af045b7c2c31e655621096fff62d45fe97aa9b45eb128ef09. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/US5541404100 — a six-check JSON result.
The Magic Flute, K. 620, Act I: Papageno's Aria - "Der Vogelfänger bin ich ja" (Instrumental Version)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83859e1bd2c04e266a08038127d42ecfee434b0356145724ac8b942f93311671. 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/US5541404108 — a six-check JSON result.
La Traviata, Act II: Germont's Aria - "Di provenza il mar, il sol" (Instrumental Version)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3044a177286492443a3fecf81398665353d17c23104fd7fa5e8533ac3588bbdd. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/US5541404134 — a six-check JSON result.
Soprano Love Arias: 50 Must-Have Opera Classics
The History of Classical Era Music (100 Famous Songs)
Grieg, E.: From Holberg's Time / Sibelius, J.: Karelia Suite / Finlandia / Valse Triste / Suite Champetre
Classical Masterpieces of the Millennium
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100 Must-Have History of Classical Music
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83dec3703c470eb5677872fb13c9ab3e57c3829249c5539bdf3cbd42fb9b4246. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/US5540501977 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b364a7935cf5382da95b5f55773d8141f7824e9ff4df262414a607a31621ec7. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/US5540502174 — a six-check JSON result.
100 Must-Have Amour Romantic Love Song Classics
Gianni Schicchi, Act I: O mio babbino caro (Instrumental Version)
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dd4e4ba805245b5fff6023992d1d36e9849854c70324d38bcc058b46dcda655. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/US5541401428 — a six-check JSON result.
100 Must-Have Valentine's Day Love Song Classics
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Classic á la Carte: International Dinner Party - Classical Music for Dining and Entertaining
The Four Seasons - Concerto No. 1 in E Major, Op. 8, RV 269 "Spring": I. Allegro
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f3fe4c5b820177c82b19b060546949e5898e41d0b6dcfb864de5b713935b006. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/US5541302507 — a six-check JSON result.
La Traviata, Act I: Libiamo ne' lieti calici (Brindisi)
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Cavalleria rusticana: Intermezzo Sinfonico
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x024423c7ccdb42740bb69c595538a2c2e39870c19f8219dfeb1783e91be0484d. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/US5541302510 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x879e1360e97e82c5cddf2a9663023a74197b0397014f31309eb5a4b6b79a2d63. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/US5541302511 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ae6974b70d4642f97d15b051226d930d2e1af9cf09a0a732eca9600b11d7f76. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/US5541302512 — a six-check JSON result.
String Quintet in E Major, Op. 11 No. 5, G. 275: III. Minuetto "The Celebrated Minuet"
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb33e1719185c74cc5a32dd4a08f1840e07cd40cba779ea6411b5e9b9a99729b9. 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/US5541302514 — a six-check JSON result.
Mandolin Concerto in C Major, RV 425: I. Allegro
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Nabucco, Act III: Va pensiero (Chorus of the Hebrew Slaves)
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The Four Seasons - Concerto No. 4 in F Minor, Op. 8, RV 297 "Winter": II. Largo
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The Valkyrie, WWV 86b, Act III: Ride of the Valkyries
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Nabucco, Act III: Chorus of the Hebrew Slaves (Instrumental Version)
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The Magic Flute, K. 620, Act II: Papageno's Aria - "Der Vogelfänger bin ich ja" (Instrumental Version)
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Gianni Schicchi: Lauretta's Aria - "O Mio Babbino Caro" (Instrumental Version)
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La Traviata, Act I: Brindisi (Instrumental Version)
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The Marriage of Figaro, K. 492, Act II: Cherubin's Song - "Voi che sapete" (Instrumental Version)
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La Bohème, Act I: Mimi's Aria - "Si, Mi Chiamano Mimi" (Instrumental Version)
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Tannhäuser, WWV 70, Act II: Entry of the Guests (Instrumental Version)
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Rigoletto, Act I: Gilda's Aria - "Caro Nome" (Instrumental Version)
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde6455baab4cebee18a6c6781f3db77dae7db2f9d79cca451f31942db58e774a. 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/US5541304823 — a six-check JSON result.
Tosca, Act II: Tosca's Prayer (Instrumental Version)
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The Marriage of Figaro, K. 492, Act I: Figaro's Aria - "Non più Andrai" (Instrumental Version)
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Turandot, Act III: Calaf's Aria - "Nessun Dorma" (Instrumental Version)
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La Traviata, Act II: Germont's Aria - "Di Provenza" (Instrumental Version)
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The Magic Flute, K. 620, Act II: Queen of the Night's Aria - ''Der hölle rache'' (Instrumental Version)
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Madama Butterfly, Act II: Butterfly's Aria - "Un bel di vedremo" (Instrumental Version)
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La Bohème, Act II: Musette Waltz and Finale (Instrumental Version)
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La Bohème, Act I: Rodolfo's Aria - "Che gelida manina" (Instrumental Version)
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Gioachino Rossini: Selected Opera Overtures
The Darkside of Classical Music: Dark, Scary & Haunting Classics
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Requiem Mass in D Minor, K. 626: VII. Lacrimosa
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Христина Ангелакова: Арии из руски опери
Anna Tomowa-Sintow: Arias from Operas by Verdi
Verdi, Bizet, Gounod: Chorus from Operas
Верди - Вагнер - Гуно - Вебер: Хорове из опери
Rachmaninoff: Symphonic Dances, Op. 45 - The Rock, Op. 7
Рахманинов: История старой цыган из оперы Алеко
Dmitri Shostakovich: Symphony No. 12 in D Minor, Op. 112 The Year 1917
Верди - Вагнер - Хренников - Шапорин: Избрани произведения
Opera Arias - Mozart, W. A. / Bellini, V. / Verdi, G. / Rossini, G. / Gounod, C. / Massenet, J. / Puccini, G. / Schmidt, F. / Wagner, R.
Melodies From 1001 Nights - Mozart, W. A. / Gluck, C. W. / Beethoven, L. Van / Cornelius, P. / Mussorgsky, M. / Verdi, G. / Bizet, G.
Chorus of the Hebrew Slaves (from Nabucco, Act III) (1842)
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Credo in un Dio Crudele (from Otello, Act II) (1887)
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Scene and Aria from La Traviata, Act I (1853)
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Anvil Chorus from Il Trovatore, Act II (1853)
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Rigoletto / Act 3 (1851): "La donna è mobile"
Bulgarian Broadcasting Symphony Orchestra
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Banquo's Recitative & Aria from Macbeth (1847)
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Willow Song & Ave Maria (from Otello, Act IV)
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Aria of Philip II (from Don Carlos, Act IV) (1867, rev.1884)
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Song Without Words, Op. 62: VI. Spring Song
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100 Must-Have Composers of Classical Music
The Bird Seller: Introduction and Waltzes
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Hungarian Rhapsody No. 2 in C-Sharp Minor, S. 244
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The History of Romantic Era Music (100 Famous Songs)