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 0xe10a0a7178761f83d6af7deb14c38879eaa6e691deead27e7229c387db525f03. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fab3c287-0693-4cd0-8c49-ab8f6bd5ee10.json and https://artists.proofprofile.net/proofs/artist/fab3c287-0693-4cd0-8c49-ab8f6bd5ee10.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Mussorgsky, Glazunov & Balakirev: Piano Works (Live at Lille Festival, 1993)
Les saisons (The Seasons), Op. 37b (arr. P. Breiner for violin and orchestra): Vi. June: Barcarolle
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 0x6df2ae38626130184218c9a83c7155fdca35e60cb317c30a758117510e950cf7. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/HKI190245806 — a six-check JSON result.
6 Morceaux, Op. 51: No. 6. Valse sentimentale
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Swan Lake, Op. 20: Act I: The terrace in front of the palace of Prince Siegfried: No. 4. Pas de trois: I. Intrada
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String Quartet No. 1 in D Major, Op. 11: Ii. Andante cantabile
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Violin Concerto in D Major, Op. 35: Ii. Canzonetta: Andante
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12 Morceaux, Op. 40: No. 2. Chanson triste in G Minor
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6 Morceaux, Op. 19 (version for cello and orchestra): No. 4. Nocturne
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The Sleeping Beauty, Op. 66: Act Ii: The Vision: Panorama (Andantino: The Awakening)
Košice Slovak State Philharmonic Orchestra
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Album for the Young, Op. 39: No. 21. Sweet Dreams (Douce rãªverie)
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The Nutcracker Suite, Op. 71a: Iii. Dance of the Sugar Plum Fairies
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Souvenir d'un lieu cher, Op. 42 (arr. A.k. Glazunov for violin and orchestra): Iii. Mélodie
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6 Romances, Op. 6 (arr. P. Nagy for piano): No. 6. None But the Lonely Heart
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The Snow Maiden, Op. 12: Act Iv: Declamation of the Fairy of Sping
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16 Waltzes, Op. 39: No. 15 in A-Flat Major
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Prelude in E Minor, Op. 28 No. 4 (Featured in "The Notebook")
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12 Etudes, Op. 10: Etude No. 12 in C Minor, Op. 10, No. 12, "revolutionary"
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13 Preludes, Op. 32: No. 5 in G Major. Moderato
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Polonaises, Op. 40: Polonaise No. 3 in A Major, Op. 40, No. 1, "Military"
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16 Waltzes, Op. 39 (Version for Solo Piano): No. 3 in G-Sharp Minor
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Nocturnes, Op. 15: No. 2 in F-Sharp Major
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Keyboard Suite No. 1 in B-Flat Major, HWV 434: IV. Minuet (Arr. W. Kempff for Piano)
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Piano Concerto No. 1 in E Minor, Op. 11, B. 53: II. Romanza. Larghetto
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21 Hungarian Dances, WoO 1 (Version for Solo Piano): No. 5 in F-Sharp Minor
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Waltzes, Op. 64: No. 1, Molto vivace "Minute"
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3 Old Viennese Dances: Kreisler - Liebesleid
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8 Klavierstücke, Op. 76: No. 3, Intermezzo in A-Flat Major
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Andante spianato et grande polonaise brillante in E-Flat Major, Op. 22: No. 1, Andante spianato, B. 88
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Orphée et Eurydice, Wq. 30: Dance of the Blessed Spirits (Arr. W. Kempff for Piano)
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Polonaise No. 6 in A-Flat Major, Op. 53 "Heroic"
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Études, Book 2: No. 13, L’escalier du diable
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Piano Sonata No. 2 in B-Flat Minor, Op. 35 "Funeral March": III. Marche funebre: Lento
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24 Préludes, Op. 28: Prelude No. 15 in D-Flat Major, Op. 28, No. 15
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Piano Concerto No. 2 in G Minor, Op. 22: II. Allegro scherzando
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Nocturne in G Major, Op. 37 No. 2: Nocturne No. 12 in G Major, Op. 37, No. 2
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Études, Op. 10: Etude No. 3 in E Major, Op. 10, No. 3
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21 Hungarian Dances, WoO 1 (Version for Solo Piano): No. 1 in G Minor [1]
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Nocturne No. 1 in B-flat Minor, Op. 9, No. 1
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Nocturne No. 2 in E-flat Major, Op. 9, No. 2
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Piano Sonata No. 2 in B-flat Minor, Op. 35, "funeral March": Iii. Marche funebre: Lento
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24 Preludes, Op. 28: Prelude No. 4 in E Minor, Op. 28, No. 4
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Nocturne No. 5 in F-sharp Major, Op. 15, No. 2
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Piano Concerto No. 1 in E Minor, Op. 11: Ii. Romanza: Larghetto
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おやすみショパン ～心地よい眠りのためのショパンメドレー～
No. 1 in A-Flat Major "Farewell" (Featured in "The Others")
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Moderato in E Major, B. 151, Op. P2 No. 12
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Waltz in F-Sharp Minor, Op. Posth., "Valse melancolique"
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Etude No. 6 in E-Flat Minor, Op. 10, No. 6 (Arr. A. Glazunov)
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Beethoven Edition, Vol. 20: Diabelli Variations, Op. 120
Rachmaninov: Preludes Op. 23 - Cinq Morceaux De Fantaisie Op. 3
İdil Biret Chamber Music Edition, Vol. 2
Ateş Pars: Piyano ve Orkestra için Konçerto
Beethoven: Piano Sonata No. 15 - Brahms: 8 Klavierstücke
İdil Biret Chamber Music Edition, Vol. 1
İdil Biret Archive Edition, Vol. 16: Johannes Brahms
Mozart: Keyboard Works (Biret Archive Edition, Vol. 15)
Brahms: Symphony No. 4, Variations on a Theme by Paganini & 8 Klavierstücke (Live)