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 0x87433917a5f76b1c4d41ddca16fe7d1161d4f03549a4c7f179bef447e26f77cb. 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/bf86c42e-d346-4404-86c0-efdb01059534.json and https://artists.proofprofile.net/proofs/artist/bf86c42e-d346-4404-86c0-efdb01059534.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Gounod: Faust (Excerpts) (Sung in Hungarian)
Faust (Sung in Hungarian): Act III: Elado az egesz vilag! (Mephisto), "Mephisto's Rondo"
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 0xa1af8e3dd4ff8038f5cd2f867509f330ff90c020fa731b16376c6468bda21854. Chain 2 (Bitcoin): anchored in block 960419 (2026-07-31T15:20:33Z), 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/HUA253241104 — a six-check JSON result.
Gluck: Orfeo ed Euridice - Mozart: Le Nozze di Figaro - Così fan tutte - La Clemenza di Tito
Annie Fischer: The Centennial Collection
Mozart: Piano Concertos Nos. 21 and 22 / Rondo, K. 382
Piano Concerto No. 21 in C Major, K. 467 "Elvira Madigan": II. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d32f3a37cac40f34a7165bbe264e293d86b0503881cd4ddf5cfbec17f8923db. 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/US5541101001 — a six-check JSON result.
The Marriage of Figaro, K. 492: Overture
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Symphony No. 40 in G Minor, K. 550: I. Molto allegro
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Soprano Love Arias: 50 Must-Have Opera Classics
Pergolesi: Stabat Mater / Respighi: Il Tramonto / Mozart: Piano Concerto No. 21, "Elvira Madigan"
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Fifty Years of Hungaroton (1951-2001) - Conductors
Lalo: Symphonie Espagnole - D'Indy: Symphonie Cevenole
50 Years of Hungaraton (1951-2000): Singers
Viennese Classicism In Slow Movements, Vol. 1: Haydn
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Janos vitez (Hero John): Act II: Bartolo, mi lesz azzal a csataval?
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Janos vitez (Hero John): Act I: Megjottek a szep huszarok
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Janos vitez (Hero John): Act II: A francia kiraly belepoje: Vivtam eletemben sok nehez csatat
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0cfcf9e6eb9030280effa9eb169b58fd47a653164bdcc22a5d5c60441f238a3. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/HUA250401202 — a six-check JSON result.
Janos vitez (Hero John): Act I: Bago dala: A fuszulyka szara
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x590e3a5719c9beca8f5843dbb4fed5778ffb7594736c02cd6f8a352aa7ac26d1. Chain 2 (Bitcoin): anchored in block 960285 (2026-07-30T17:26:40Z), 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/HUA250401103 — a six-check JSON result.
Janos vitez (Hero John): Act II: Janos belepoje: Szep huszarok
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5093092760f11a662f1f73dc1d208ee6e762e78c19d98fb6daaf6d148c3903f. 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/HUA250401203 — a six-check JSON result.
Janos vitez (Hero John): Act I: Mellettem csatazo pajtasom
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x609b43f1deeda6cb2bf7277388349bef8035b47aee76eb12524144b3554df8c5. 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/HUA250401104 — a six-check JSON result.
Janos vitez (Hero John): Act II: Egyuttes: Szep a huszar, ha lora pattan
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9a4a3619f46e4d6d46ca4cb9a88b99a514c545129d24f3ad0ef784447864bfb. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/HUA250401204 — a six-check JSON result.
Janos vitez (Hero John): Act I: Egyuttes
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7491645c88cadef014330bfc8bc58023c2f624099d4e2571f9685b173a3cfc85. 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/HUA250401105 — a six-check JSON result.
Janos vitez (Hero John): Act I: Jancsi belepoje: En a pasztorok kiralya
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd41a11e8259bef41ba770b9d1d534894547f9742ae5f3213bc667b1c213986e. 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/HUA250401106 — a six-check JSON result.
Janos vitez (Hero John): Act I: Iluska dala: Van egy szegeny kis arvalany
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Janos vitez (Hero John): Act II: Finale B
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa73d43f3989d856d06821cf30699cc93ef74760cf15862593a9903825dd80ed8. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/HUA250401207 — a six-check JSON result.
Janos vitez (Hero John): Act I: Furulyanota: En vagyok a bojtargyerek, Jancsi
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e51ced84a31fc3a910b73a84e0b7a161edbed60b3a454a6697c3e8123255f5b. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/HUA250401108 — a six-check JSON result.
Janos vitez (Hero John): Act II: Finale C
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x590a118bce4f8959bda4e7ebd75e5000cdb2903542979a4dd29601ee8c545ab3. 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/HUA250401208 — a six-check JSON result.
Janos vitez (Hero John): Act III: Elozene
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b50e6869fa356e49dfd13428064cffe54e5e95abef80613e1cbf34d224403ae. 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/HUA250401209 — a six-check JSON result.
Janos vitez (Hero John): Act III: Bago dala: A furulyam, jaj be busan szol
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e937e85f3b78cef3bd04aea7b56a593d981d0e3813a0871348e99ffabdae986. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/HUA250401210 — a six-check JSON result.
Janos vitez (Hero John): Act II: A francia kiralyleany dala: O csak ne volnek gyonge lanyka
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2cfbb110133259fc47ac10a5c5cce2f7c39ac696a0fb3a924b35a6c92e683bf. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/HUA250401111 — a six-check JSON result.
Janos vitez (Hero John): Act III: Kek to, tiszta to
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Janos vitez (Hero John): Act III: Finale A: Balett
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Janos vitez (Hero John): Act III: Finale C: Befejezo melodrama
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Viennese Classicism In Slow Movements, Vol. 2: Mozart
Klavierkonzert Nr. 21 C-Dur, K. 467, "Elvira Madigan": 2. Andante (Elvira Madigan): Piano Concerto No. 21 in C Major, K. 467, "Elvira Madigan": II. Andante
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Violin Concerto No. 4 in D Major, K. 218: II. Andante cantabile (cadenza by Joseph Joachim)
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Klarinettenkonzert A-Dur, K. 622: 2. Adagio (Jenseits von Afrika): Clarinet Concerto in A Major, K. 622: II. Adagio (cadenza by Bela Kovacs)
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Divertimento No. 7 in D Major, K. 205: III. Adagio
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Piano Concerto No. 23 in A Major, K. 488: II. Adagio
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0f2756d76881d413f0167ae590014f71c31d05bd4661373f8393178a824da78. 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/HUA253147215 — a six-check JSON result.
Mozart, W.A.: Zauberflote (Die) / Idomeneo [Opera] (Highlights)
Die Zauberflote (The Magic Flute), K. 620, Act II: Heil sei euch Geweihten
Bulgarian National Svetoslav Obretenov Choir
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Bartók: Symphonic Works, Vol. 2 (Complete Edition)
Haydn: Symphonies "Oxford" & "The Clock"
Sass, Sylvia: Soprano Arias From Verdi and Donizetti
Rosetti / Danzi / Winter / Weber: Bassoon Concertos
Mendelssohn: Octet / String Symphony No. 10 / Wagner: Siegfried Idyll
Komlossy, Erzsebet: Mezzo-Soprano Arias - Gluck, W. / Verdi, G. / Erkel, F. / Saint-Saens, C. / Wagner, R. / Mussorgsky, M.
Hidas: Horn Concerto No. 2 / Hollos: Cornotturno / Vukan: Horn Concerto
Agay, Karola: Songs by Stradella, Caccini, Scarlatti, Britten and Others, and Hungarian Love Songs
Mozart, W.A.: Ave Verum Corpus / Exsultate Jubilate / Laudate Dominum / Church Sonata No. 15 / Fantasy in F Minor, K. 608 / Ah, Lo Previdi