thumb|260px|Sinfonia Varsovia orchestra during La Folle Journée in Nantes, 2009 The Sinfonia Varsovia is a Polish orchestra and musical institution based in Warsaw. The orchestra gives its concerts p
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 0x921725ca46130a52fc0ab0849aa8682e3e22a567b1f930d02e1c35330192b092. 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/7ef15b7b-b1ce-4b1d-be1e-80717046faca.json and https://artists.proofprofile.net/proofs/artist/7ef15b7b-b1ce-4b1d-be1e-80717046faca.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Mozart: Symphony No. 40 in G Minor, K. 550: I. Molto allegro
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 0xca6c8742dd6f86799f006cb701cabc0327ffba9223f41ea89c9c04789212a86f. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GBAYC8900342 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ecd5b423b5b0a4067d8eb93baa0d454c002e1873850f3d5bddde8f54ba6733d. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/FRZ130839010 — a six-check JSON result.
Ruralia Hungarica, Op. 32b: Andante rubato, alla zingaresca
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Jewish Traditional: Song In Remembrance of Schubert
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Jeux D'enfants, After Janacek's Moravian Folksongs: I. -
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Jeux D'enfants, After Janacek's Moravian Folksongs: II. -
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Jeux D'enfants, After Janacek's Moravian Folksongs: III. -
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Jeux D'enfants, After Janacek's Moravian Folksongs: IV. -
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Jeux D'enfants, After Janacek's Moravian Folksongs: V. -
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Jeux D'enfants, After Janacek's Moravian Folksongs: VI. -
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Jeux D'enfants, After Janacek's Moravian Folksongs: VII. -
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a26892cad836e427c51fe28d6acd24ddc6b8a571907da4e3718f89e5409ec11. 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/FRZ130839080 — a six-check JSON result.
Variations On a Slovak Folksong: Theme, Rubato
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Variations On a Slovak Folksong: Variation 1, Moderato
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Variations On a Slovak Folksong: Variation 2, Poco Allegro
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Variations On a Slovak Folksong: Variation 3, Moderato
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Variations On a Slovak Folksong: Variation 4, Scherzo, Allegretto
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Variations On a Slovak Folksong: Variation 5, Allegro
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Rückert-lieder: Ich bin der Welt abhanden gekommen
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7eb99f70213d97d64893409413798f9d8a10729e80fd9c35bb80238aab7beb0c. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/FRZ130839110 — a six-check JSON result.
George Walker: Great American Orchestral Works, Vol. 4
Concerto for Flute, Harp, and Orchestra in C Major, K. 299: I. Allegro - Cadenza by Carl Reinecke
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Concerto for Flute, Harp, and Orchestra in C Major, K. 299: 2. Andantino - Cadenza by John Thomas
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Concerto for Flute, Harp, and Orchestra in C Major, K. 299: III. Rondo (Allegro) - Cadenza by Carl Reinecke
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Piano Concerto No. 21 in C Major, K. 467 - Arr. by Andreas Tarkmann: II. Andante
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Piano Sonata No. 11 in A Major, K. 331 - "Alla Turca" - Arr. by Andreas Tarkmann: Theme and Variations
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The Magic Flutes: Adagio - Allegro con brio
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Piano Sonata No. 11 in A Major, K. 331 - "Alla Turca" - Arr. by David Overton: Rondo alla Turca
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Divertimento in D, K.334 - Arranged by David Overton: 3. Menuetto - Trio - Menuetto
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Violin Concerto, Op. 33, FS 61, CNW 41: I. Praeludium - Largo. Allegro cavallerésco
Sofia Gubaidulina: Works for Cello & Accordion
Seven Words for Cello, Accordion & Strings: I. Father, Forgive Them, for They Know Not What They Do
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Seven Words for Cello, Accordion & Strings: II. Woman, Behold Thy Son. Son, Behold Thy Mather
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Seven Words for Cello, Accordion & Strings: III. Verily, I Say unto Thee – Today Shalt Thou Be with Me in Paradise
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Seven Words for Cello, Accordion & Strings: IV. My God, My God, Why Hast Thou Forsaken Me?
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Seven Words for Cello, Accordion & Strings: V. I Thirst
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Seven Words for Cello, Accordion & Strings: VI. It Is Accomplished
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Seven Words for Cello, Accordion & Strings: VII. Father, into Thy Hands I Comment My Spirit
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe58de06e66e4feff499d3d344933fad3d0ba58f9173462105961eb27737ea298. 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/PLE442140008 — a six-check JSON result.
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Mozart: Piano Concerto No. 21 in C Major, K. 467: II. Andante
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Mozart: Symphony No. 41 in C Major, K. 551 "Jupiter": IV. Molto allegro
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Mozart: Piano Concerto No. 23 in A Major, K. 488: II. Andante
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Trio Sonata for 2 Violins and Continuo in G Minor, HWV 393 "Dresden" No. 2: III. Largo (Arr. for Oboe, Violin, Harpsichord and Orchestra by Andreas Tarkmann)
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Mozart: Symphony No. 40 in G Minor, K. 550: II. Andante
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Concerto for Clarinet and Orchestra in G Minor, Op. 29: I. Allegro agitato
Rietz, Bruch & Weber: The Romantic Clarinet
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Concerto for Clarinet, Viola and Orchestra in E Minor, Op. 88: I. Andante con moto
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Concerto for Clarinet and Orchestra in G Minor, Op. 29: II. Adagio
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