Walter Klien (27 November 1928 – 9 February 1991) was an Austrian pianist. thumb|right|Walter Klien on concert tour 1977. Dedicated to Southern Africa tour organiser Hans Adler Career Klien was born
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 0xe4192f0e479c149e3849d6c8fb3dacdef4b5ca698ef1dc3d79790e619b2e160f. 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/a92b2626-7bdd-4f2a-9361-41d9241a239e.json and https://artists.proofprofile.net/proofs/artist/a92b2626-7bdd-4f2a-9361-41d9241a239e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Schubert: Violin Sonata in A Major, D. 574; Fantasia in C Major, D. 934; Rondo in B Minor, D. 895 / R. Strauss: Violin Sonata in E-Flat Major, Op. 18, TrV 151 (Remastered 2023)
Violin Sonata in A Major, D. 574: I. Allegro moderato - Remastered 2023
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 0x8a132c98471ec760e3a6a934f761673aba4ab392588e7f4c4b8e0bc9038035ac. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF056503141.
Violin Sonata in A Major, D. 574: II. Scherzo. Presto - Remastered 2023
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x064c6ab10f872bb31173bc73d55a531366f7cfe86fb93578fbbb395e2ad22493. Chain 2 (Bitcoin): anchored in block 960288 (2026-07-30T17:41:38Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF056503142.
Violin Sonata in A Major, D. 574: III. Andantino - Remastered 2023
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6713ad14bbd504348b9d9553ddd0820ecdaba2b4f14930f67cedc4d9fce0c91. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/DEF056503143.
Violin Sonata in A Major, D. 574: IV. Allegro vivace - Remastered 2023
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa26fc81a6ec2d3ae491eb2e2e229c4776d323b78938da9b40e03c896bdb1d473. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF056503144.
Fantasia in C Major, D. 934: I. Andante molto - Remastered 2023
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05704ca5b450cc17642260bf4db7b3ccaed7ccad478c21c9e315c26b65d5071c. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF056503131.
Fantasia in C Major, D. 934: II. Allegretto - Remastered 2023
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x672c53db82ef067aea0bf430e32bfb10c37e071b09a21f57c8de037a3bacc344. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF056503132.
Fantasia in C Major, D. 934: III. Andantino - Remastered 2023
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f7b8ba0cbce3524153ae78942368762517677baaebf4252152221780122e553. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF056503133.
Beethoven: Choral Works & Piano Concertos
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Mozart: Piano Concerto No. 27 in B-Flat Major, K. 595
Mozart: Piano Concerto No. 17 in G Major, K. 453 & Piano Concerto No. 27 in B-Flat Major, K. 595
Mozart: Piano Concerto No. 17 in G Major, K. 453
Schumann: Ouvetüre, Op 52 - 6 Kanons, Op. 56 - Romanzen, Op. 28
Kinderszenen, Op. 15: I. Von fremden Ländern und Menschen
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Kinderszenen, Op. 15: II. Kuriose Geschichte
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Kinderszenen, Op. 15: IV. Bittendes Kind
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96210e46733429a41a8a53ecb8239272bd3ffd4a556be2d9075fc7add3dfdc34. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEWDL0778507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x801a0ba14d8e7027461193441a37a1fc1587eab856ed608503d18f2c331b3e4f. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEWDL0778508.
Dvorák: Slavonic Dances, Violin Concerto in A Minor & Romance in F Minor
Vivaldi, Bach, Mozart, Paradis & Brahms: Violin Works (Live)
Blue Edition - Schumann: 3 Romances & Kinderszenen
Bizet: Jeux d'enfants (Menuetto Kids - Klassik für Kinder)
Ravel: Ma mère l'oye (Menuetto Kids - Klassik für Kinder)
Masterpieces for Piano Left Hand [Brahms, Martinů, Janáček, Strauss]
Wolfgang Amadeus Mozart: Two Sonatas for Piano
BRAHMS: Variations on a Theme of Schumann, op.9/ 1. Theme
Schubert: Piano Sonatas No. 16, 19 & 21 - Arpeggione Sonata
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef5c7be433514fdac884f5bd8960cbbd6f74835a7ae3526b967d80d2416995b9. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSJ11002733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8d45231072ab54b3ec152e99e432753cc4c2608169205c3fcafc027ac853b70. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSJ11002741.
Brendel - Mozart - Concerto For Two Pianos And Orchestra - Sonata For Two Pianos
Brahms - Fantasias - Intermezzi - Piano Pieces
Beethoven - Piano Sonatas - Moonlight - Pathetique - Appassionata
Piano Sonata No. 14 "Moonlight" in C Sharp Minor, Op. 27, No. 2 - Adagio Sostenuto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x556902365ad493022606870af42a703392cdb22f25ed70dd7e2ffc2f1ef67d80. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSJ11002251.
Mozart: The Violin Sonatas, Vol.3 (Complete Mozart Edition)
Violin Sonata in B-Flat Major, K. 378: I. Allegro moderato
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Violin Sonata in B-Flat Major, K. 454: I. Largo – Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5a14a82a1db1b6810e842f418b4e279737bf456bc46dccaf2ed80b705aa4b3d. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA508021001.
Violin Sonata in B-Flat Major, K. 378: II. Andantino sostenuto e cantabile
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc90abd721dd4ded44c2367fb39ddb3ea332aff35487410da01400872a8e0c59f. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/NLA508021070.
Violin Sonata in B-Flat Major, K. 454: II. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73f4c21fa3d98f29725d03414991a08c880ed0a87387732eabaaaccec30903c4. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA508021002.
Violin Sonata in B-Flat Major, K. 378: III. Rondeau. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70a8cc9fcfbe39b4318f0428ca3d67c91f1e99de641fa23049d8fed5b7ccd4a1. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA508021071.
Violin Sonata in B-Flat Major, K. 454: III. Allegretto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x799c6f200ae933113134fcbf58b37e28095dc7dae5e7905ac592f8ba9c57559d. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA508021003.
Violin Sonata in G Major, K. 379: Ia. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe569f0af58ba80f078c795fafc540de90dd0bb1705114e0e68f2b93e0512d74d. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA508021029.
Violin Sonata in E-Flat Major, K. 481: I. Molto allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0727e162ad7f08eb1cfcffae12a8b403a62dde228fc3af4b76c348927b8e66bb. Chain 2 (Bitcoin): anchored in block 960430 (2026-07-31T16:09:41Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA508021054.
Violin Sonata in G Major, K. 379: Ib. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93b009b5f0a8bcfb07043dcc208707fe1b99858a90f477f80a79d01c5e4d8ea6. Chain 2 (Bitcoin): anchored in block 960422 (2026-07-31T15:27:29Z), 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/NLA508021030.
Violin Sonata in G Major, K. 379: II. Tema con variazioni: Theme. Andantino cantabile
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Violin Sonata in E-Flat Major, K. 481: III. Allegretto con variazioni: Theme
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Violin Sonata in G Major, K. 379: II. Tema con variazioni: Var. 1 (Violino tacet)
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Violin Sonata in E-Flat Major, K. 481: III. Allegretto con variazioni: Var. 1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc146390298a2e364eac4dc588d268123e2c02ef15049de4c32996118bb52143d. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA508021057.
Violin Sonata in G Major, K. 379: II. Tema con variazioni: Var. 2
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc40cc3c272dd34ba471befd4588f0d9b325197a8fa6bf843b2d40d8b4ebb736b. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA508021033.
Violin Sonata in E-Flat Major, K. 481: III. Allegretto con variazioni: Var. 2
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f2ba6937dcd91ef6bd4e0f632e4d5ff2da1d6333fd23aa3428262ae3b283c2d. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA508021058.
Violin Sonata in G Major, K. 379: II. Tema con variazioni: Var. 3
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Violin Sonata in G Major, K. 379: II. Tema con variazioni: Var. 4
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Violin Sonata in E-Flat Major, K. 481: III. Allegretto con variazioni: Var. 4
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44827d1e663f4e67a98d6ecb04576ec83eaf1bc1d884baa3326b3eeb5407340b. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/NLA508021060.
Violin Sonata in G Major, K. 379: II. Tema con variazioni: Var. 5
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Violin Sonata in E-Flat Major, K. 481: III. Allegretto con variazioni: Var. 5
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Violin Sonata in G Major, K. 379: II. Tema con variazioni: Theme. Allegretto – Coda
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Violin Sonata in E-Flat Major, K. 481: III. Allegretto con variazioni: Var. 6
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e4dab63cffd651ad068d81c51c519bd1d0cb88b6c961420f0a07ec2d272f0a2. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA508021062.
Violin Sonata in E-Flat Major, K. 380: I. Allegro
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Violin Sonata in E-Flat Major, K. 380: II. Andante con moto
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Violin Sonata in A Major, K. 526: II. Andante
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Violin Sonata in E-Flat Major, K. 380: III. Rondeau. Allegro
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Piano Concerto No. 21 in C Major, K. 467: II. Andante
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Beethoven: Piano Sonatas Nos. 13, 14 & 23
Schumann: Davidsbündlertänze / Kreisleriana
Piano Concerto No. 23 in A Major, K. 488: II. Adagio
映画の中のクラシック モーツァルトの映画館
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Piano Sonata No. 16 in C Major, K.545 "Sonata facile", I. Allegro
Uplifting Classical - Music to energize your mood
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Piano Sonata No. 11 in A Major, K. 331, III. Alla Turca - Allegretto
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