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 0x8cbf0e29bc55251cc97e4626ed9655fd6201f4ac9a855fb0958edd012a0f32e3. 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/271ed394-ab30-4dd8-bdb3-2379ca3c20b0.json and https://artists.proofprofile.net/proofs/artist/271ed394-ab30-4dd8-bdb3-2379ca3c20b0.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Fuchs: The Complete Works for Cello & Piano
Hiller: Piano Quartet No. 3 in A Minor, Op. 133 & Piano Quintet in G Major, Op. 156
Huber: Piano Quintet No. 1 in G Minor, Op. 111 & Piano Quintet No. 2 in G Major, Op. 125
Radu Paladi: Concertos & Symphonic Suite "The Little Magic Flute"
Berger: Konzertstück, Op. 43a / Symphony, Op. 71
Labor: Piano Concertos for the Left Hand Nos. 1-3
Piano Concerto for the Left Hand No. 1: I. Introduktion - Thema
Deutsche Staatsphilharmonie Rheinland-Pfalz
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 0x83bc01249bd713b21b21274b187dd6f3e069d1b618522a26ada8fcf415a13378. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB262300231 — a six-check JSON result.
Piano Concerto for the Left Hand No. 1: III. Var. 3
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0c0bbb8bf109ee4fa007b41f98ff8dc5bdc23dd8b12a13904c63204a7e5d81c. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB262300233 — a six-check JSON result.
Piano Concerto for the Left Hand No. 2: III. Finale
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3413935cc788c56296d75656f1e9a051e5d1ad89e728de51b6ac2f4dfe66f76f. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB262300238 — a six-check JSON result.
Schaeuble: Piano Concerto, Op. 50, Oboe Concertino, Op. 44 & Serenade, Op. 42
Constantinescu: Piano Concerto & Wedding in the Carpathians
Hans Gál - Concertinos for violin/ cello / piano/string serenade
Serenade for String Orchestra, Op. 46: Cavatina. Lento cantabile
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d3f09b74e6692ddd62d2249c127cb96315c6f76367e3c79c0d7a1df403c7b3a. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEAD62304910 — a six-check JSON result.
Leiviskä: Piano Concerto in D Minor, Op. 7 & Symphony No. 1 in B-Flat Major
Frumerie: Clarinet Concerto, Op. 51, Piano Concertino, Op. 78, Musica per nove, Op. 75 & Suite for Small Orchestra, Op. 5b
Heinrich Hofmann - Complete Piano Chamber Music
Frid: The Complete Works for Violin and Piano
Johanna Senfter - Complete Works for Viola And Piano
Nápravník: Piano Quartet in A Minor, Op. 42 & Violin Sonata in G Major, Op. 52
Serenade on Old Graz Contredanses, Op. 83b: V. Menuet
The Georgian Chamber Orchestra Ingolstadt
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf2cc6a36cce3e465b5c89ae6a8ebb2eb35514f13ea0f51601a1f2749f063e95. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB262100685 — a six-check JSON result.
Frühling: Piano Quintet in F-Sharp Minor, Op. 30 & Piano Quartet in D Major, Op. 35
Piano Quintet in F-Sharp Minor, Op. 30: I. Allegro molto agitato ed appassionato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x533dc41d65db715119a4adc82897fe3f418f0bc3c7034960eaab5de0278b6892. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/DEAD62106201 — a six-check JSON result.
Piano Quintet in F-Sharp Minor, Op. 30: II. Andante cantabile
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ce61ca35e3cc6305c4909227d3c543fed5ef2c2045978d4a5bf0d5952b14869. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEAD62106202 — a six-check JSON result.
Piano Quintet in F-Sharp Minor, Op. 30: III. Scherzo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dda0cc1aabedb781b5e6725212b7b4ae1213fcd74e26e39b07ec97cf01d9434. 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/DEAD62106203 — a six-check JSON result.
Piano Quintet in F-Sharp Minor, Op. 30: IV. Finale
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f122cc9a364a2880b2fa316fa260bf63e2f74a2a18fd1b31d5c773dfdd897f8. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEAD62106204 — a six-check JSON result.
Piano Quartet in D Major, Op. 35: I. Allegro moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd15e8ff5e3803ef2303511e0c554530402265decfa86fead13d635c3d3ebf6d5. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEAD62106205 — a six-check JSON result.
Piano Quartet in D Major, Op. 35: II. Scherzo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ac0355d303a800d604c7783b4f7be444a59dc22b125f4e201a42c1b3b9bd98e. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/DEAD62106206 — a six-check JSON result.
Piano Quartet in D Major, Op. 35: III. Larghetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f0c7a990d7a5699f84a43861202c86279e1b905c07a47e2e36e6e32bb980052. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEAD62106207 — a six-check JSON result.
Schubert, Weinberg & Others: Double Bass Works
Dubois: Piano Quintet in F Major & Piano Quartet in A Minor
Piano Concerto No. 3 in D Minor: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11ec52f8932689cb273c373f1af3acab857e53462027d6be33e500c57a7f709c. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/DEB201705501 — a six-check JSON result.
Labor: Piano Quintet in E Minor, Op. 3 & Piano Quartet in C Major, Op. 6
Reizenstein: Piano Concerto No. 2 & Orchestral Works
Frid: Symphony No. 3, Double Concerto & Inventions
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cefe9cc1e17329f1bc32d90f632d889666b657222f3b23b39af5ce56e0b6cf7. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/DEB201605404 — a six-check JSON result.
Rudolf Moser: Overture to a Church concert Op. 41
Antal Doráti: Piano Concerto - Mátyás Seiber: Orchestral Suite from "The Invitation" - Renaissance Dance Suite
Piano Concerto in C Minor, Op. 16: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e805fa66dad8af23e6d7566ef5820574626e1bd198327907e8e24857f8c1dcc. 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/DEB201715201 — a six-check JSON result.
Rössler: Sextet, Op. 16 & Piano Quintet, Op. 28
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48705345ce9ffae7f37e7f56742a1036c6e95d43fce0092c80bc77fdeafc83ed. 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/DEAD62400806 — a six-check JSON result.
Mathilde Kralik von Meyerswalden: Piano Trio / Violin Sonata/ Nonet
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25b40e8150808a966b89e826ac84408449d6cc41d8bdec8e92cae052717e3924. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/DEAD62307806 — a six-check JSON result.