thumb|Estonian National Male Choir in Brussels (2017) Estonian National Male Choir () is an Estonian male choir. As of about 2020, it is the largest full-time professional male choir in the world. Th
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 0xd7a1b76bc268b72d1ee60bf6de55ac599d4a702091fba8077879f935ba396e87. Chain 2 (Bitcoin): anchored in block 953909 (2026-06-16T07:53:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/139b96e2-f38b-4958-9226-5431e77eb3bd.json and https://artists.proofprofile.net/proofs/artist/139b96e2-f38b-4958-9226-5431e77eb3bd.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Vivaldi: The Four Seasons, Violin Concerto in F Minor, Op. 8 No. 4, RV 297 "Winter": I. Allegro non molto
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 0x4b29229fcb2cfa775ca18acb0e2edd7ba1ed32b0fc2280da7ce24fee8cc28148. Chain 2 (Bitcoin): anchored in block 957084 (2026-07-07T20:41:57Z), 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/GBAYC0003260 — a six-check JSON result.
Mozart: 3 German Dances, K. 605: No. 3 in C Major "Die Schlittenfahrt"
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Debussy: Children's Corner, CD 119, L. 113: No. 4, The Snow Is Dancing
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Purcell: King Arthur, Z. 628, Act 3: Prelude While Cold Genius Rises - Song. "What Power Art Thou"
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Glazunov: The Seasons, Op. 67, Pt. 1 "Winter": No. 3, Frost Variation
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Schubert: Winterreise, Op. 89, D. 911: No. 1, Gute Nacht
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Chopin: 12 Études, Op. 25: No. 11 in A Minor "Winter Wind"
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Mendelssohn: 6 Gesänge, Op. 19a: No. 3, Winterlied, MWV K72
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Schumann: Album für die Jugend, Op. 68: No. 38, Winterzeit I
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x212a267cfbb501e493ac2a4869e9e369c4cad5cd047753cb547a44a66581bdb8. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/FRZ209642650 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90bd121c3e9ed3c6c0c50982f479d8dbe65b967fd851dbca46290334425a1c8a. 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/GBAYC1800770 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1127d96aa11e4e7362cc02519151b5b396e4891a0334e49a4f827683efe4d0b9. 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/DEA809646800 — a six-check JSON result.
MacDowell: New England Idyls, Op. 62: III. Mid-Winter
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Haydn: The Seasons, Hob. XXI:3, Winter: No. 39, Lied mit Chor. "Ein Mädchen, das auf Ehre hielt" (Hanne, Chorus)
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd8bbcce0ab74a85513ab0061eb66400edf725eb75fcdf2be73a4d4bdae8df8d. 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/GBAYD8000070 — a six-check JSON result.
Jarre: The Engadiner Suite for Piano Trio: III. Winter
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Wolf: 6 Lieder für eine Frauenstimme: No. 5, Wiegenlied im Winter
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e551f46a624f3f4fc64cbaa51f4fe5a59fb7f20d718fa399a15d89dda7dc3c2. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/GBPFW2200237 — a six-check JSON result.
Prokofiev: Cinderella, Op. 87, Act 1: No. 16, Winter Fairy
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Strauss, R: 5 Lieder, Op. 48: No. 4, Winterweihe
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Delius: 3 Small Tone Poems: No. 2, Sleigh Ride
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Tveitt: 50 Folk-Tunes from Hardanger, Op. 150: No. 37, The Long, Long Winter Night
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Beethoven: Symphony No. 7 in A Major, Op. 92: II. Allegretto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7bc942c1bd68bd27012bdd6f5f108569cf8dc989147a3ceaf9eee168632b15c. 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/GBAYC2002550 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5802ff69f0604fc04dc919fcdd9234da910954c96dd922e787ddef96ff4f9069. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/GBELP0500262 — a six-check JSON result.
Shor: Four Seasons of Manhattan: III. Winter
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Say: Art of Piano, Op. 66: III. Winter Morning in Istanbul
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f8f7044e584042021482cc8f771fb407783668392f215f1e48f11e81db1052c. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/DEA809400006 — a six-check JSON result.
Lully: Isis, LWV 54: Prélude - Chœur. "L'hiver qui nous tourmente" - Récit. "Laissez-moi, cruelle Furie !" - Chœur. "Ah, quelle peine de trembler" (Chœur, Io, La Furie)
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Ravel: Piano Trio in A Minor, M. 67: I. Modéré
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Hahn: Le rossignol éperdu: No. 52, Hivernale
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Piazzolla: Estaciones porteñas: IV. Invierno porteño (Arr. Assad for Guitar)
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Tchaikovsky: Symphony No. 1, Op. 13 "Winter Daydreams": III. Scherzo. Allegro scherzando giocoso
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Rimsky-Korsakov: The Snow Maiden, Act 3: Dance of the Tumblers
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Elgar: 2 Part Songs, Op. 26: No. 1, The Snow
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Poulenc: 7 Chansons, FP 81: No. 1, La blanche neige
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Violin Concerto No. 2 "The American Four Seasons": Movement IV
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Liszt: 12 Études d'exécution transcendante, S. 139: No. 12, Chasse-neige. Andante con moto
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Bach, JS: Weihnachtsoratorium, BWV 248, Pt. 2: No. 10, Sinfonia
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Charpentier: Dispute de bergers, H. 484 "Il faut rire et chanter": II. Brouillards, glaçons, neige, frimas
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Brahms: Symphony No. 3 in F Major, Op. 90: III. Poco allegretto
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Shostakovich: Symphony No. 13 - Part: De profundis
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Symphony No. 13, Op. 113 "Babi Yar": I. Babi Yar
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Symphony No. 13, Op. 113 "Babi Yar": II. Humour
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Double Bass Concerto "Farewell to St. Petersburg"
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Cherubini: Requiem Mass No. 2 in D Minor
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Meestelaulud, II sari: No. 8. Tantsulaul (Men's Songs, Vol. 2) [Dancing Song]
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Tormis: Bulgarian Triptych, North Russian Bylina, 3 Hungarian Folksongs, 3 Stars & 3 Livonian Folksongs
Shostakovich: Symphony No. 13: II. Humour
Chants populaires d'Estonie (Mono Version)
Grieg: Peer Gynt, Op. 23, Act 1: No. 1, Prelude. At the Wedding
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Grieg: Peer Gynt, Op. 23, Act 2: No. 3a, Halling
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Grieg: Peer Gynt, Op. 23, Act 2: No. 4, Prelude. The Abduction of the Bride. Ingrid's Lament
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Grieg: Peer Gynt, Op. 23, Act 2: No. 6, Peer Gynt and the Woman in Green
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Grieg: Peer Gynt, Op. 23, Act 1: No. 3b, Spring Dance
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Grieg: Peer Gynt, Op. 23, Act 2: No. 7, In the Hall of the Mountain King
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Grieg: Peer Gynt, Op. 23, Act 2: No. 8, Dance of the Mountain King's Daughter
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Grieg: Peer Gynt, Op. 23, Act 3: No. 12, The Death of Åse
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Grieg: Peer Gynt, Op. 23, Act 4: No. 13, Prelude. Morning Mood
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Grieg: Peer Gynt, Op. 23, Act 4: No. 15, Arabian Dance
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Grieg: Peer Gynt, Op. 23, Act 4: No. 16, Anitra's Dance
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Grieg: Peer Gynt, Op. 23, Act 4: No. 17, Peer Gynt's Serenade
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Grieg: Peer Gynt, Op. 23, Act 4: No. 18, Solveig's Song
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Grieg: Peer Gynt, Op. 23, Act 4: No. 20, Peer Gynt at the Statue of Memnon
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Grieg: Peer Gynt, Op. 23, Act 5: No. 21, Prelude. Peer Gynt's Homecoming
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Grieg: Peer Gynt, Op. 23, Act 5: No. 22, The Shipwreck
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Grieg: Peer Gynt, Op. 23, Act 5: No. 23, Solveig Sings in the Hut
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Grieg: Peer Gynt, Op. 23, Act 5: No. 25, Whitsun Hymn
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Grieg: Peer Gynt, Op. 23, Act 5: No. 26, Solveig's Cradle Song
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Sibelius: Lemminkäinen Suite - Pelléas & Mélisande
Sibelius: Night Ride and Sunrise, Op. 55
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Sibelius: The Maiden in the Tower: Overture
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Solveig Kringelborn/Paavo Järvi/Stockholms Filharmoniska Orkester
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Sibelius: The Maiden in the Tower, Scene 1: Allegro molto (Maiden, Bailiff)
Solveig Kringelborn/Garry Magee/Estonian National Symphony Orchestra/Paavo Järvi
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Sibelius: Lemminkäinen Suite, Op. 22: I. Lemminkäinen and the Maidens of the Island
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Sibelius: Lemminkäinen Suite, Op. 22: II. The Swan of Tuonela
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Sibelius: Lemminkäinen Suite, Op. 22: III. Lemminkäinen in Tuonela
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Sibelius: Lemminkäinen Suite, Op. 22: IV. Lemminkäinen's Return
Paavo Järvi/Elemér Lavotha/Stockholms Filharmoniska Orkester
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Sibelius: Pelléas et Mélisande Suite, Op. 46: I. At the Castle Gate
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Sibelius: Pelléas et Mélisande Suite, Op. 46: II. Mélisande
Estonian National Symphony Orchestra/Paavo Järvi/Tõnis Tracksman
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Sibelius: Pelléas et Mélisande, Op. 46: III. At the Seashore
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Sibelius: Pelléas et Mélisande Suite, Op. 46: IV. A Spring in the Park
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Sibelius: Pelléas et Mélisande Suite, Op. 46: V. The Three Blind Sisters
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Sibelius: Pelléas et Mélisande Suite, Op. 46: VII. Mélisande at the Spinning Wheel
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Sibelius: Pelléas et Mélisande Suite, Op. 46: VIII. Entr'acte
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Sibelius: Pelléas et Mélisande Suite, Op. 46: IX. The Death of Mélisande
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Grieg: Piano, Orchestral & Vocal Works, Chamber Music
Pärt: Cantus in memoriam Benjamin Britten
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Tormis: Swing Songs: No. 3, A Pretty Girl on the Swing
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Tormis: Swing Songs: No. 4, The Swing Asks for Gifts
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Shostakovich: Suite for Jazz Orchestra No. 2, Op. 50b: No. 2, Waltz
Orchestre Philharmonique de Radio France
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Kullervo, Op. 7: III. Kullervo and His Sister
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Kullervo, Op. 7: IV. Kullervo Goes to War
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Sibelius - Jungfrau i tornet/Pelleas & Melisande/Valse triste
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Sibelius: 2 Pieces from Kuolema, Op. 44: No. 1, Valse triste
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Ellerhein Girls' Choir/National Male Choir of Estonia/Estonian National Symphony Orchestra/Paavo Järvi
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Beethoven: Symphony No. 9 in D Minor, Op. 125 "Choral": IV. Presto - "O Freunde, nicht diese Töne!" (Ode to Joy) [Excerpt]
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Orfeo ed Euridice, Wq. 30, Act II Scene 2: Dance of the Blessed Spirits
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