thumb|1915 photo of Rudolph Reuter. Published in the Musical Courier. Rudolph Reuter (September 21, 1888 – January 4, 1973) was an American pianist and professor. Early life, education and early car
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 0xc6dc000a546ae873c526302987aac647038bf2144d54f9298e87cfab793b9307. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/820ae048-eb95-40b6-bda9-46674e140d1d.json and https://artists.proofprofile.net/proofs/artist/820ae048-eb95-40b6-bda9-46674e140d1d.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Great Piano Transcriptions from the Golden-Age
Chant Polonaise No. 5, S.480, Transcription of Chopin's My Joys (Polish Songs) Op. 74, No .12 - Welte-Mignon 1035
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 0x67913f02d5dd0caa82aee9578a20c762f53af95e292c94aa00431526fedb349b. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEPI82402344 — a six-check JSON result.
Samson Et Dalila: My Heart at Thy Sweet Voice - Welte-Mignon 2260
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26cf1ee06c5062668ca53f4ee2773807f08341f369aec54844ec03c6ee762740. 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/DEPI82307663 — a six-check JSON result.
Ruins of Athens. Op. 113 (Arr. Solo Piano by Busoni): Fantasie - Welte-Mignon 1322
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd784185f872bc6a7a0bc5de8ee0f86eec51c0211b9b4dabc4df107495c44503e. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/DEPI82319243 — a six-check JSON result.
Adelaide, Op. 46 (Arr. Solo Piano by Liszt) - Welte-Mignon 443
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe12909aca2420f6a7a8d2017a8fdb3ca98f3b1623b3c4473b18317aaa90c8c72. 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/DEPI82320677 — a six-check JSON result.
Concerto for Piano and Wind Instruments: Allegro from Mov. I (Arr. Solo Piano by Stravinsky) - Duo-Art 528-4
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7cd7e1aaf2162f8539afb9c0a3a73d22ca742169e8461a66a3bb682814fc304. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/DEPI82314140 — a six-check JSON result.
Piano Concerto, Op. 16: II. Adagio (Arr. Solo Piano by Grainger) - Duo-Art 6479
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22fe0aceb9f2402e2e6d876cb8b1be3653943e60eabc8358870528f38975598b. 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/DEPI82308245 — a six-check JSON result.
Piano Concerto No. 1, Op. 25 (Arr. By Backhaus): I. Molto Allegro Con Fuoco - Duo-Art 6967
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Piano Concerto No. 1, Op. 25 (Arr. By Backhaus): II. Andante - Duo-Art 6968
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Piano Concerto No. 1, Op. 25 (Arr. By Backhaus): III. Presto - Molto Allegro E Vivace - Duo-Art 6981
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Piano Concerto No. 1, Op. 11 in E Minor: Romance, from 2nd Movement (Arr. Solo Piano by Backhaus) - Welte-Mignon 3310
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3cab5ffde632d5886b22f5cd8bc8c132554757ecfe117b9d10bf62b233ef7d5. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/DEPI82319202 — a six-check JSON result.
Piano Concerto, Op. 54 (Arr. Solo Piano by Adam-Benard): ‎I. Allegro Affettuoso - Welte-Mignon 28
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Piano Concerto No. 26 K.537 "Coronation Concerto" in D Major (Arr. Solo Piano by Carl Reinecke): II. Larghetto - Welte-Mignon 237
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Piano Concerto No. 1, in E Flat R 455, S.124 (Arr. Solo Piano by László): I. Allegro Maestoso - Welte-Mignon 3333
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Piano Concerto No. 1, in E Flat R 455, S.124 (Arr. Solo Piano by László): II. Quasi Adagio - Welte-Mignon 3334
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Piano Concerto No. 1, in E Flat R 455, S.124 (Arr. Solo Piano by László): III - IV. Allegretto Vivace - Allegro Animato Allegro Marziale Animato - Welte-Mignon 3334
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Piano Concerto No. 20 K.466 (Arr. Solo Piano by Mayer-Mahr): II. Romance - Duca Dca 749
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Piano Concerto No. 26, "Coronation Concerto" in D Major K.537 (Arr. Solo Piano by Grunfeld): II. Larghetto - Duca 519
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Piano Concerto No. 5, Op. 73: I. Allegro (Arr. Solo Piano by Backhaus) - Triphonola T-51951A
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Symphony No. 8 (Unfinished) in B Minor: II. Andante Con Moto (Arr. Solo Piano by Laszlo) - Welte-Mignon 3316
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x483a01a1d9987f8b90ee4c3b111007865a69c6314d9041050a24cddee105dad5. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/DEPI82314141 — a six-check JSON result.
Symphony No. 5, Op. 64 (Arr. Solo Piano by Laszlo): I. Andante, Allegro Con Anima - Welte-Mignon 3324
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Adelaide, Op. 46. (Arr. Solo Piano by Liszt) - Duo-Art 7380
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90fe50f25e0c8ec1a4d95a5063c849b340a7782e5ea166edec3d4abdc2107ed4. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEPI82314129 — a six-check JSON result.
Egmont, Op. 84: Overture (Arr. Solo Piano by Kohlberg) - Welte-Mignon 1801
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Leonore Overture No. 3, Op. 72a (Arr. Solo Piano by Ritter) - Welte-Mignon 3130
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Die Zauberflote (The Magic Flute): Overture (Arr. 4 Hands Piano by Ganz) - Duo-Art 536-4
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Die Zauberflote (The Magic Flute): Overture (Arr. Solo Piano by Kohlberg) - Welte-Mignon 1802
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3434ab05561eea24ec220ba662f5ca93195f38588412dc2ac2c0f8b997a7efac. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEPI82320965 — a six-check JSON result.
Bolero (Arr. Solo Piano by Ganz) - Duo-Art 74728
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1c54e09de2eea727cf4e025ca5bbbe11c106d385b2c070ad9c7fa0e944cca31. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEPI82310550 — a six-check JSON result.
Violin Sonata No. 2, Bourree in B Minor (Transcription by Saint-Saens) - Upon Piano Roll Duo-Art 67719, Issued 1924
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Leonore Overture No .3 to Fidelio. Op. 72B - Upon Piano Roll Duo-Art 7423, Issued 1930
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Don Giovanni. Fantasia - Upon Piano Roll Welte-Mignon 876, Issued 1911
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd281054308da7314750ed59ba9cd1e097c75c379efee5a953efec7685f564218. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEPI82440161 — a six-check JSON result.
Piano Concerto No. 1, Op. 11 in E Minor: I. Allegro Maestoso - Upon Piano Roll Welte-Mignon 3976, Issued 1915
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa88af1e766ab285ecd034ce205ef59f2a828541762512ad66392119d4167e27a. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEPI82440160 — a six-check JSON result.