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 0x75d0bf2c089b2cce319ca26ba648c51e1441e14a6af5f1e442053211bfc74dc1. 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/0747cd9e-db80-45ec-ac65-afd802a907e1.json and https://artists.proofprofile.net/proofs/artist/0747cd9e-db80-45ec-ac65-afd802a907e1.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
100 MASTERPIECES OF WORLD CLASSICAL MUSIC (THE PART 5)
Divertimento in B-flat Major for Two Horns and Strings, K. 287: i. 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 0xb256a10d2e096d4805e3dc85766fae3d489babd7f715dc850672b81524d57846. 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/USKO11300033.
Divertimento in B-flat Major for Two Horns and Strings, K. 287: ii. Andante grazioso con variazioni
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd247da25d6101b6d6927095587b7046c526239a4f459b79de4a07a3334278bb1. 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/USKO11300034.
Divertimento in B-flat Major for Two Horns and Strings, K. 287: iii. Menuetto. Trio 1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf2bcf0d39b391e9976a4b324bbef134c1e87d7680e2815363ad9056b600f53e. Chain 2 (Bitcoin): anchored in block 960429 (2026-07-31T16:07:24Z), 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/USKO11300035.
Divertimento in B-flat Major for Two Horns and Strings, K. 287: iv. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ac5fb0b6f22fcf66b61608bc298795d3f47d88cf3f4b079f2ca1fe6584b426c. 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/USKO11300036.
Divertimento in B-flat Major for Two Horns and Strings, K. 287: vi. Andante. Allegro molto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa40e3b762c6487564820c9e8975bd9c6e7fddf9d4023818f8ed16147b647afba. 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/USKO11300038.
Divertimento in F for String Ensemble, K.138: i. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x950eec63ce24b55151a4ff14a7201e2a99260d9a8c3189c1d0a8b619747f6e1b. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/USKO11300039.
Divertimento in F for String Ensemble, K.138: ii. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7f99203a7b046460350436418ae7acc617990c1d3e1e39b08e2cdfc70869756. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/USKO11300040.
Divertimento in F for String Ensemble, K.138: iii. Presto
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Horn Concerto No. 3 in E-flat Major, K. 447: i. Allegro maestoso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57615e4134d55457d864066c95e94d65991d28d9b49d6cbd2fc2ece00149f2fc. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/USKO11300042.
Horn Concerto No. 3 in E-flat Major, K. 447: ii. Romance: Larghetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe0c57b5a3a19e77f4ccafc78e2349a61adc0be8906bb00a299ff75c378d81f5. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/USKO11300043.
Horn Concerto No. 3 in E-flat Major, K. 447: iii. Rondo: Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x686ba44d798912b14d2e102fa80e33a2452969b6dbadd40eb8721ef898ff1711. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/USKO11300044.
Horn Concerto No. 4 in E-flat Major, K. 495: i. Allegro moderato
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Horn Concerto No. 4 in E-flat Major, K. 495: ii. Romanze: Andante cantabile
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Horn Concerto No. 4 in E-flat Major, K. 495: iii. Rondo: Allegro vivace
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Horn Concerto No. 2 in E-flat Major, K. 417: i. Allegro maestoso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06d8f4c4b572e2c5c62b4469bbd2ec4738239e6e00fa9798166f25d09c5b9eca. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/USKO11300048.
Horn Concerto No. 2 in E-flat Major, K. 417: ii. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd4544e553759219861ae3c02fb18698091bfb47f1dac20f4e47bf38eea1c030. 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/USKO11300049.
Horn Concerto No. 2 in E-flat Major, K. 417: iii. Rondo: Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x259d17ad45fb100f13d54e9f1e0bfcda9a8e5150763e5866c8872cbfa13b3bdb. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/USKO11300050.
Horn Concerto No. 1 in D Major, K. 412: i. Allegro
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Horn Concerto No. 1 in D Major, K. 412: ii. Rondo: Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e07a584d2e63ef7eb527fd0ae38bd1c88faba943952af36732a8226e273320f. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USKO11300052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdba95a4e6006df295a567a1be7ba2d823bc51cf04497a7b7e4b305668ebcf865. 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/USKO11300068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c929ab2502c73a0762de9a3c0464e1e4320f8667aeb4b1e512465ab2388a43d. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), 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/USKO11300069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb80f44d684d7742a47d667adb13d543021e9466ef96f33f9df63461799d5a101. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/USKO11300070.
Sonata in B flat Major, K. 333: i. Allegro
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Sonata in B flat Major, K. 333: ii. Adagio
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Sonata in B flat Major, K. 333: iii. Allegro assai
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64ffdd8a4356d119de48c23cab4e10edf3d4cf5b3a13b1a1c7900323fbc4176d. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), 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/USKO11300074.
Sonata in C Minor, K. 457: i. Molto allegro
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20c5d4b2bc4a666a78f5f0f90c894ff6fd9a0b4404b24b4a1edf342b97789415. 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/USKO11300076.
Sonata in C Minor, K. 457: iii. Allegro assai
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Serenade in G Major, K. 525 ('Eine Kleine Nachtmusik'; 'A Little Night Music'): i. Allegro
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Serenade in G Major, K. 525 ('Eine Kleine Nachtmusik'; 'A Little Night Music'): ii. Romance: Andante
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Serenade in G Major, K. 525 ('Eine Kleine Nachtmusik'; 'A Little Night Music'): iii. Menuetto: Allegretto
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Serenade in G Major, K. 525 ('Eine Kleine Nachtmusik'; 'A Little Night Music'): iv. Rondo: Allegro
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String Quintet No. 4 in G Minor, K. 516: i. Allegro
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Mozart's Lacrimosa (Epic Powerful Version)
Mozart's theme from the 1st movement of Symphony No. 40
Mozart's "A little night music" 2nd movement (Romance)
Mozart - Piano Sonata No.2 in F major, K.280 189e, 2 Adagio
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Mozart - Piano Sonata No.9 in D major, K.311 284c, 2 Andantino con espressione
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Mozart - Piano Sonata No.10 in C major, K.330 300h, 2 Andante cantabile
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Mozart - Piano Sonata No.17 in B♭ major, K.570, 3 Allegretto
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01 Mozart - La ci darem la mano from Don Giovanni, Op.66
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02 Mozart - 5 Variations in G major, K.501 (Piano Duet)
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03 Mozart - 12 Variations on a Minuet by Fischer, K.179 189a
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04 Mozart - 9 Variations on a Minuet by Duport, K.573
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05 Mozart - Fantasia in C minor, K.396 385f
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06 Mozart - Fantasia in D minor, K.397 385g
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08 Mozart - Sonata for 2 Pianos in D major, K.448 375a, 1 Allegro con spirito
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09 Mozart - Sonata for 2 Pianos in D major, K.448 375a, 2 Andante
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11 Mozart - Piano Sonata in F major, K.Anh.135 547a
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12 Mozart - 12 Variations on `Ah, vous dirai-je maman`, K.265 300e
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Mozart Piano Sonata No.16 in C Major, KV 546, "Sonata Facile", I. Allegro
Piano Sonata No.11 in A Major, KV331 III. Alla Turca
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Piano Exam Pieces 2025 & 2026, ABRSM Grade 7
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Piano Exam Pieces 2025 & 2026, ABRSM Grade 4
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A:13 Andante grazioso and Vars. 1–6 (1st movt from Sonata in A, K. 331)
Piano Exam Pieces 2025 & 2026, ABRSM Grade 8
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