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 0xb6f5a467bce90c243f551d53b95f595bbfa1baa5d659c950a7fec8c3e41af2a6. 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/7753083a-49fb-4fef-bac7-a61e40b79448.json and https://artists.proofprofile.net/proofs/artist/7753083a-49fb-4fef-bac7-a61e40b79448.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Stamitz, Paisiello & Liszt: Piano Concertos
Yellow Edition - Mozart: Violin Concerto No. 3, K. 216 & Piano Concerto No. 22, K. 482
Orange Edition - Mozart: Violin Concerto No. 3, K. 216 & Symphony No. 55, K. Anh.214
Orange Edition - Mozart: Violin Concerto No. 2, K. 211 & Symphony No. 7, K. 45
Red Edition - Mozart: Violin Concertos Nos. 3 & 2
Green Edition - Mozart: Violin Concerto No. 3, K. 216 & Serenade No. 7 "Haffner", K. 250
Green Edition - Mozart: Violin Concerto No. 2, K. 211 & Serenade No. 7 "Haffner", K. 250
Classical Masterpieces - Georg Friedrich Telemann: Ouverture-Suite for Viola da Gamba & Table Music Suite No. 1
Green Edition - Telemann: Ouverture-Suite for Viola da gamba, TWV 55:D6 & Ouverture-Suite, TWV 55:C6
Green Edition - Bach: Harpsichord Concerti Nos. 3,4 & Violin Concerto No. 1, BWV 1041
Yellow Edition - Mozart: Piano Concerto No. 15 & Violin Concerto No. 5, K. 219
Yellow Edition - Mozart: Violin Concerto No. 5 & Piano Concerto No. 8, K. 246
Yellow Edition - Mozart: Piano Concerto No. 15 & Violin Concerto No. 4, K. 218
Yellow Edition - Mozart: Violin Concerto No. 4 & Piano Concerto No. 8 "Lützow"
Grey Edition - Mozart: Violin Concerto No. 5 & Sinfonia concertante for Violin, Viola and Orchestra, K. 364
Grey Edition - Mozart: Violin Concerto No. 4 & Sinfonia concertante for Violin, Viola and Orchestra, K. 364
Red Edition - Mozart: Piano Concerto No. 15, K. 450 & Symphony No. 31, K. 297
Red Edition - Mozart: Piano Concerto No. 15, K. 450 & Symphonies Nos. 32, 33
Orange Edition - Mozart: Violin Concerto No. 5, K. 219 & Symphonies Nos. 11, 44
Orange Edition - Mozart: Violin Concerto No. 4, K. 218 & Symphonies Nos. 11, 44
Durante, Hammerschmidt & Others: Choral Works
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 0x8dbc34c67dce1a7db2653eb9dcf564b1c5f364b0796c100c42729e4df466583c. 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/DEB262100161 — a six-check JSON result.
Concerto for Violin & Piano, Op. 105: I. Allegro non troppo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45ac32fff9474b18825d4d0147e1e7ed6ab71ec5c535751b705e88eea30a1f7c. 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/DEB262100162 — a six-check JSON result.
Concerto for Violin & Piano, Op. 105: II. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42639d38219c1ca18e642128794787f711ec5f354b5ee15cdd35c94741970b9b. 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/DEB262100163 — a six-check JSON result.
Concerto for Violin & Piano, Op. 105: III. Allegretto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83363bacf9cdf9b487693ca1ca72505a7f94e54484b1e15863c6741c1e826ee7. 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/DEB262100164 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ed8e1a2a0dcacab01d586b04528421ac69a3307bad8970bae164ea6afd196c9. 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/DEB262100165 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf669deb379f6aeb4694bd0743b3bde283f0a4720019d3343231affa36f74806. 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/DEB262100166 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23f416dc848cc29348c49441cc1ccc70fcddb16f61aa752753e1a66c12676da1. 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/DEB262100167 — a six-check JSON result.
Cello Concerto in C Minor, YC98 (Attrib. J.C. Bach): I. Allegro molto ma maestoso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d34b26488def3219f6c881155206912f9a75fda47cea950831cbd715b8b0400. 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/DEAD61608204 — a six-check JSON result.
Cello Concerto in C Minor, YC98 (Attrib. J.C. Bach): III. Allegro molto energico
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1eeb8b2b79bd217bc273c5a85079182cfff0370a6ff7f407e98437878d0b2ef2. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEAD61608206 — a six-check JSON result.
Cello Concerto in D Major, Op. 6 No. 1: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaeb1d0567a6e8eb356b394b8a4d8936ebaf12c3ef15ac8da231238572a19486a. 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/DEAD61608208 — a six-check JSON result.
Green Edition - Mozart: Violin Concerto No. 5, K. 219 & Symphonies Nos. 7, 55
Green Edition - Mendelssohn: String Symphony No. 8, MWV N8 & Piano Quartet No. 2, Op. 2 MWV Q13
Green Edition - Mendelssohn: String Symphonies Nos. 1, 2, 10 & Piano Quartet No. 2, Op. 2 MWV Q13
Green Edition - Mendelssohn: String Symphonies Nos. 1, 2, 10 & Piano Quartet No. 1, MWV Q11
Blue Edition - Haydn: Symphonies Nos. 59, 88 & 94
Green Edition - Mozart: Piano Concerto No. 15, K. 450 & Sinfonia concertante for Violin, Viola and Orchestra, K. 364
Red Edition - Mendelssohn: String Symphony No. 8, MWV N8 & Rondo Capriccioso, Op. 14
Red Edition - Mendelssohn: String Symphony No. 8, MWV N8 & Piano Concerto No. 1, Op. 25
Blue Edition - Mendelssohn: Violin Concerto, MWV O3 & String Symphonies Nos. 1, 2
Blue Edition - Mendelssohn: String Symphonies Nos. 8, 10 & Violin Concerto, MWV O3
Orange Edition - Mendelssohn: Symphony No. 4 "Italian" & String Symphonies Nos. 1, 2, 10
Orange Edition - Mendelssohn: String Symphony No. 8, MWV N8 & Symphony No. 4 "Italian", Op. 90
Orange Edition - Mendelssohn: String Symphony No. 8, MWV N8 & A Midsummer Night's Dream
Orange Edition - Mendelssohn: A Midsummer Night's Dream & String Symphonies Nos. 1, 2, 10
Yellow Edition - Haydn: Symphonies Nos. 49, 53 & 88
Green Edition - Vivaldi: Concertos RV 293, 297, 524, 533, 571 & RV 256
Green Edition - Vivaldi: Mandolin Concerto, RV 425 & The Four Seasons "La primavera" - "L'estate"
Krommer : Clarinet Concerto in E flat major Op.36 : I Allegro
Krommer & Mozart : Clarinet Concertos (Elatus -)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd70c1c0085004b4162c8ea8a5bf6fd227b34d900a29f2be730fa92b33843df0e. 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/DEA809709901 — a six-check JSON result.
Württemberg Chamber Orchestra Heilbronn, Günter Kehr & Douglas Haas
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb33a53524ad8a39f34bd108c964c799ef6319d8c548be713d5c080703e93b3c. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USZDG0600002 — a six-check JSON result.
Krommer : Clarinet Concerto in E flat major Op.36 : II Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48af114762b8863f6b8d812d985e753ad7d4d258f078beae1ac77e15d6d149e7. 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/DEA809709902 — a six-check JSON result.
Krommer : Clarinet Concerto in E flat major Op.36 : III Allegro moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadecb1e9afdb23ddf12e274b4b7b2a042cdb3c140f786dcf79fc2f2585e8b925. 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/DEA809709903 — a six-check JSON result.
Polonaise for Violin and Orchestra in B-Flat Major, D. 580
The Classical Music featured in 'Little Women'
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb5eddccc0ae828c45b338026b7bb915961b8eeeeb45e970a1290cd8cad80f8b. 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/USZDG0602015 — a six-check JSON result.
Brandenburg Concerto No. 5 in D Major, BWV 1050, I. Allegro
Uplifting Classical - Music to energize your mood
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfb0bc508a1271434fe8ae6ad334d36c23bd978d8ed0222a4a2abeb3206a6998. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/USZDG0600082 — a six-check JSON result.
Concerto for Lute and Strings in D Major, RV 93: II. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe33c1543858a791e379393508014f10ef8e2dfb1d120a83c835683a467d587f2. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/USZDG0600858 — a six-check JSON result.
Clarinet Concerto in A Major, K. 622: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b52c34f567cf0b6ff7b68e87a29f3910c61d2885b0817bde56108e1c4c14e3a. 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/DEA809709802 — a six-check JSON result.