1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → block must exist at that height 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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c4b98e0c26a4c2019579d859df05ef4c6eaddd7a9671b492dbfe3e80a7718e0. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/71f2ad4d-6e4a-4fd2-9da5-944057a7a9ca.json and https://artists.proofprofile.net/proofs/artist/71f2ad4d-6e4a-4fd2-9da5-944057a7a9ca.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Violin Sonata No. 3 in D Minor, Op. 108: III. Un poco presto e con sentimento
Clarinet Sonata in F Minor, Op. 120 No. 1 (Arr. L. Berio for Clarinet & Orchestra): III. Allegretto grazioso
4 Ballades, Op. 10: No. 1 in D Minor. Andante "Edward"
4 Ballades, Op. 10: No. 2 in D Major. Andante espressivo e dolce
Violin Sonata No. 2 in A Major, Op. 100: I. Allegro amabile
4 Gesänge, Op. 43: No. 1, Von ewiger Liebe
2 Songs, Op. 91: No. 2, Geistliches Wiegenlied
Double Concerto for Violin and Cello in A Minor, Op. 102: III. Vivace non troppo
Piano Trio No. 1 in B Major, Op. 8: II. Scherzo
String Quintet No. 2 in G Major, Op. 111: III. Un poco Allegretto
WDR Symphony Orchestra Cologne Chamber Players
Piano Quartet No. 1 in G Minor, Op. 25 (Orch. By A. Schoenberg): II. Intermezzo - Allegro ma non troppo
String Sextet No. 1 in B-Flat Major, Op. 18: III. Scherzo. Allegro molto
Ein deutsches Requiem, Op. 45: IV. Wie lieblich sind deine Wohnungen
Variations on a theme by Haydn, Op. 56a "St. Anthony Variations": Thema, "Chorale St. Antoni". Andante
21 Hungarian Dances, WoO 1 (Version for Orchestra): No. 1 in G Minor. Allegro molto
Symphony No. 1 in C Minor, Op. 68: III. Un poco allegretto e grazioso
Symphony No. 3 in F Major, Op. 90: III. Poco allegretto
Symphony No. 4 in E Minor, Op. 98: I. Allegro non troppo
Symphony No. 2 in D Major, Op. 73: IV. Allegro con spirito
Mozart: Piano Quartets (Live At Pierre Boulez Saal)
Piano Quartet No. 1 in G Minor, K. 478: I. Allegro - Live At Pierre Boulez Saal
Piano Quartet No. 1 in G Minor, K. 478: II. Andante - Live At Pierre Boulez Saal
Piano Quartet No. 1 in G Minor, K. 478: III. Rondo (Allegro moderato) - Live At Pierre Boulez Saal
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 → block OTSBitcoinBlock must exist at that height 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb97ced2686adef0ebccc339fa002b7e9f17c74f95d31a4d42b9d2702e903828. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN961701533.
Piano Quartet No. 2 in E Flat Major, K. 493: I. Allegro - Live At Pierre Boulez Saal
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Piano Quartet No. 2 in E Flat Major, K. 493: II. Larghetto - Live At Pierre Boulez Saal
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Piano Quartet No. 2 in E Flat Major, K. 493: III. Allegretto - Live At Pierre Boulez Saal
Chanson perpétuelle, Op. 37 (Version for Mezzo-Soprano & Piano Quintet)
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Gypsy Song, Op. 55, B. 104 (Arr. D. Ward for Mezzo-Soprano & Chamber Ensemble): No. 1, Ma piseu zas mi laskou zni
Gypsy Song, Op. 55, B. 104 (Arr. D. Ward for Mezzo-Soprano & Chamber Ensemble): No. 2, Sirokymi rukavy
Gypsy Song, Op. 55, B. 104 (Arr. D. Ward for Mezzo-Soprano & Chamber Ensemble): No. 3, Me srdce casto
Gypsy Song, Op. 55, B. 104 (Arr. D. Ward for Mezzo-Soprano & Chamber Ensemble): No. 4, Zalo dievca
Gypsy Song, Op. 55, B. 104 (Arr. D. Ward for Mezzo-Soprano & Chamber Ensemble): No. 5, Kdyz mne stara matka
Gypsy Song, Op. 55, B. 104 (Arr. D. Ward for Mezzo-Soprano & Chamber Ensemble): No. 6, Struna naladena
In Folk Tone, Op. 73, B. 146 (Arr. D. Ward for Mezzo-Soprano & Chamber Ensemble): No. 7, Dobru noc
2 Songs, Op. 91: No. 1, Gestillte Sehnsucht
3 Songs from William Shakespeare: No. 1, Musick to heare
3 Songs from William Shakespeare: No. 2, Full fadom five
3 Songs from William Shakespeare: No. 3, When Daisies pied
Chansons Madécasses, M. 78: No. 1, Nahandove
Chansons Madécasses, M. 78: No. 3, Il est doux
5 Ophelia Songs, WoO 22 (Arr. A. Reimann for Mezzo-Soprano & String Quartet): No. 1, Wie erkenn' ich dein Treulieb
5 Ophelia Songs, WoO 22 (Arr. A. Reimann for Mezzo-Soprano & String Quartet): No. 2, Sein Leichenhemd weiß wie Schnee zu sehn
5 Ophelia Songs, WoO 22 (Arr. A. Reimann for Mezzo-Soprano & String Quartet): No. 3
5 Ophelia Songs, WoO 22 (Arr. A. Reimann for Mezzo-Soprano & String Quartet): No. 4, Sie trugen ihn auf der Bahre bloß
5 Ophelia Songs, WoO 22 (Arr. A. Reimann for Mezzo-Soprano & String Quartet): No. 5, Und kommt er nicht mehr zurück?
Říkadla, JW 5/16: No. 1, The mole creeps
Říkadla, JW 5/16: No. 2, Karel rode off to hell
Říkadla, JW 5/16: No. 3, Franta, the knacker's son
Říkadla, JW 5/16: No. 4, Children, hear my sermon
Říkadla, JW 5/16: No. 5, Ho ho, off the cows go
Říkadla, JW 5/16: No. 7, Vacek scallywag
Říkadla, JW 5/16: No. 8, Frantik, Frantik
4 Songs, Op. 27, TrV 170: No. 4, Morgen! (Arr. for Mezzo-Soprano, Violin & Piano by Magdalena Kožená, Sir Simon Rattle & Wolfram Brandl)
3 Gymnopédies (Arr. S. Shibe for Guitar): No. 1, Lent et douloureux
3 Mélodies, Op. 7: No. 1, Après un rêve (Arr. For Cello & Piano)
Suite Bergamasque, L. 75: III. Clair de lune (Arr. A. de la Vega for Flute & Piano)
La Courte Paille, FP 178: No. 3, La reine de coeur
Gnossiennes (Arr. S. Shibe for Guitar): No. 3, Lent
Première Rhapsodie, L. 116 (Version for Clarinet & Orchestra)
Vocalise-étude en forme de Habanera, M. 51 (Arr. A. de la Vega for Flute & Piano)
Pavane pour une infante défunte, M. 19 (Arr. S. Shibe for Guitar)
Cello Concerto "Tout un monde lointain": IV. Miroirs
Le Tombeau de Couperin, M. 68: IV. Rigaudon. Assez vif "Piere & Pascal Gaudin"
Pièces de clavecin, Book 2, Ordre douzième: No. 8, L'Atalante
Préludes, Livre 1, L. 117: No. 8, La fille aux cheveux de lin (Arr. A. de la Vega for Flute & Piano)
Catalogue d'Oiseaux, I/42, 3e Livre: No. 6, L'Alouette lulu
2 Pieces for Violin & Piano (Arr. M. Haimovitz for Cello & Piano): No. 1, Nocturne
Les Pêcheurs de perles, WD 13, Act I: Je crois entendre encore
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Organ Symphony No. 5 in F Minor, Op. 42 No. 1: V. Toccata
Pavane pour une infante défunte, M. 19 (Version for Orchestra)
Pelléas et Mélisande Suite, Op. 80: III. Sicilienne. Allegretto molto moderato
L'apprenti sorcier: Scherzo after a ballade by Goethe
Daphnis et Chloé, M. 57, Tableau III: Lever du jour
Prélude à l'après-midi d'un faune, L. 86
Symphony fantastique, Op. 14: Vc. Songe d'une nuit de sabbat
Images pour orchestre, L. 122, No. 2c: Ibéria
Pelléas et Mélisande (Suite symphonique) [Arr. J. Nott for Orchestra], Act 1: A forest
Ma Mère l'Oye, M. 62: III. Pavane de la Belle au bois dormant
Messagesquisse for Solo Cello and Six Violoncellos
Messagesquisse for Solo Cello and Six Violoncellos - Viola Version