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 0x0b76146a4ceaa399daa49348918c001d992efcb5d3a61a70662bde33284ac142. Chain 2 (Bitcoin): anchored in block 953648 (2026-06-14T15:20:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/384e54f3-4e21-40ec-8df9-43ea28ab4ac5.json and https://artists.proofprofile.net/proofs/artist/384e54f3-4e21-40ec-8df9-43ea28ab4ac5.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Slonimsky, Tsytovich & Others: Chamber Concertos
Arapov: Violin Concerto & Concerto for Violin, Piano and Percussion
Haydn: Oboe Concerto - Horn Concerto No.1 - Horn Concerto No.2
Haydn: Symphony No. 44 "Funeral" - Symphony No. 45 "Farewell" - Symphony No. 73 "La chasse"
Mozart: Violin Concerto No. 1 in B-Flat Major, K. 207 - Violin Concerto No. 3 in G Major, K. 216
Mozart: Divertimento in D Major, K. 136 - Bassoon Concerto in B-Flat Major, K. 191
Spendiarov - Three Palms; Spohr - Violin Concerto No 8; Stamic - Clarinet Concerto
Schubert - Duet for Violin & Piano; Schumann - Fantasy for Violin etc
Vivaldi, Bach, Marcello & Telemann: Concertos for Oboe and Orchesrta
Concert for Oboe and String Orchestra in C Minor: I. Allegro moderato
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 0x081e3ca09d0a2a143d840dbba22fa0924d38bac8564979a8eb7564c00abaed2c. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USA370561361 — a six-check JSON result.
Concert for Oboe and String Orchestra in C Minor: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x779872accdec7ee3f1d6b5868f734a6c59491dc5a5f1699c5966ba6e414e2c30. 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/USA370561362 — a six-check JSON result.
Concert for Oboe and String Orchestra in C Minor: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b05d42bb14474193346ed815eaa492b42036626db8a11a3edf22aa856307d64. 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/USA370561363 — a six-check JSON result.
Oboe Concerto in F Minor, TWV 51f1: II. Largo e piano - Vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaabbfc222df613a4e431f3cc3794bbbbc99f5daad86e77bd50113b736986e27b. 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/USA370561365 — a six-check JSON result.
Oboe Concerto in F Minor, TWV 51f1: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55d2c2f0b6fe050d31d1f83b77b1ce18a9c5880a4d3fc4d4601fa39b2c4d68b8. 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/USA370561352 — a six-check JSON result.
Brandenburg Concerto No. 1 in F Major, BWV 1046: II. Adagio - Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6603aff7641767b1513f0cc3f64c19c24b36c80523f12c46eba0e6c87ec03ef. 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/USA370561085 — a six-check JSON result.
Brandenburg Concerto No. 1 in F Major, BWV 1046: IV. Menuet
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a7aa95aef538b5f1ff71db6fa52c5bb68bde7cd0c8d888abb2631eb6f72379b. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), 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/USA370561086 — a six-check JSON result.
Water Music Suite No. 3 in G Major, HWV 350: No. 17 Rigaudon presto - No. 18 Rigaudon
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dd1b705615cb7c8dc27c70a7cb36cdb4a22a8063505f642ed6c21b1f632a01d. 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/USA370561088 — a six-check JSON result.
Water Music Suite No. 3 in G Major, HWV 350: No. 19 Menuet
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbe5e45f838049c4b8939a71912acbbb47a8bd7955c3c2a813763edfdfd4265b. 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/USA370561089 — a six-check JSON result.
Water Music Suite No. 3 in G Major, HWV 350: No. 21 Gigue
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33d7a08380ad4a84b64b98e8f21be2b37232ad0ace121277db14f3f82114955b. 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/USA370561091 — a six-check JSON result.
Water Music Suite No. 3 in G Major, HWV 350: No. 22 Gigue
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89847f27f3ab087f8b93453fbf45280edd0c5271e239286257dcc1eaa438a3e4. Chain 2 (Bitcoin): anchored in block 959138 (2026-07-22T14:10:55Z), 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/USA370561092 — a six-check JSON result.
Suite In B-Flat Major, TWV 55B1 "Tafelmusik": I. Overture
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0d99e1826f9a943012b6557ce88bf711838fa4049a6716e407da0cb2b45936c. 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/USA370561093 — a six-check JSON result.
Antonio Vivaldi: 7 Concertos for Wind Instruments
Vivaldi: Concertos for String and Wind Instruments: Rv 394, Rv 534, Rv 535, Rv 501 "La Notte" and Sinfonia G Major Rv 146
Antonio Vivaldi: Viola d'Amore concertos - Cello concertos
Mozart: Violin Concerto No. 5 in A Major, K. 219 "Turkish"
Mozart: Symphony in G Major, K. Anh. 221/45a "Old Lambach"
Mozart: Symphony No. 9 in C Major, K. 73
Mozart: Symphony No. 10 in G Major, K. 74
Mozart: Sinfonia Concertante in A Major, K. 320e
Mozart: Concertone for Two Violins and Orchestra in C Major, K. 190
Concertone for Two Violins and Orchestra in C Major, K. 190: I. Allegro spiritoso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a599800fc69dd5e5d1ea308084c67a45236f6abac3629d603a308f853f3cecf. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/QM6N21558630 — a six-check JSON result.
Bach: Cello Concerto in B-Flat Major, H.436
Bach: Brandenburg Concerto No. 6 in B-Flat Major, BWV 1051
Bach: Brandenburg Concerto No. 5 in D Major, BWV 1050
Bach: Brandenburg Concerto No. 4 in G Major, BWV 1049
Bach: Brandenburg Concerto No. 3 in G Major, BWV 1048
Concerto for 2 Keyboards in C Minor, BWV 1062: II. Andante e piano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17ab914cfcaf0733ea3e860f42ed97ba47bd6fe0e1e99ea512f955cf76638399. 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/USB8U1521920 — a six-check JSON result.