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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x728cb703aa868493d7adf0db82fae72b39b265d8c007007e62afcf9adcd36f16. 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/852bd63f-ffd5-48ec-8df4-d4358bc089b8.json and https://artists.proofprofile.net/proofs/artist/852bd63f-ffd5-48ec-8df4-d4358bc089b8.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
4 Bagatelles, Op. 28: I. Aus der Zopfzeit
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a1b87d1b18913edb7fe059538f98cb02367544eb4007d7f0dd04ad2f81804a8. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY331901558.
Chausson: Concert for Violin, Piano and String Quartet in D Major, Op. 21 & String Quartet in C Minor, Op. 35
Violin Sonata No. 5 in F, Op. 24 'Spring': II. Adagio molto Espressivo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58470b265d051fd7004c4c2838d6e7acf3d6c960694f7fb118ec0cbdc7f9dc48. 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/NLY331211945.
Violin Sonata No. 5 in F, Op. 24 'Spring': IV. Rondo: Allegro ma non Troppo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05bb796a62071ad5088020c05c37435d51d589afd442dded99bbb1ce57a29859. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY331211947.
Violin Sonata No. 1 in A Minor, Op. 105: III. Lebhaft
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90fb4349934595ea4d1e30b484f629ac632bf1c438c070639c3ad1944f70359e. 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/NLY331507078.
Sonata No. 2 in A Major, Op. 100: II. Andante tranquillo - Vivace - Andante - Vivace di più - Andante - Vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf72a6a5e835c0974c92ec69ddb1cf1e780f9a7350e84446f9c225762866b374. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/NLY331405618.
Violin Sonata No. 2 in E-Flat Major, Op. 102: IV. Allegro grazioso, non presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec7d8f326c4427c863dd331bb22d97a049a5e0ecd98b163b98e7e3a5c0b6a452. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY331405798.
Violin Sonata No. 10 in G, Op. 96: II. Adagio Espressivo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6d7f0a178068ab567c723018c16ae10a5c8ef1c4143f71daadb3e3e3a62fd13. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY331211962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a06a05c68dfeb06a7de064b526e1a4a5f3d4834c12770cb00278a255bbd3ec0. 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/NLY331904103.
Violin Sonata No. 2 in G Major, M.77: III. Perpetuum mobile, allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a098d9afc80dab039aa1bf3c396e7889b7ed3c641c52bea0e3419523a3e96d8. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/NLY331904108.
Sonata No. 3 in D Minor, Op. 108: IV. Presto Agitato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76e57e1f73e7b706f75a594e250eb332fafc6adc7956e8eb8a98e0ee3d557c38. 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/NLY331405623.
Beethoven: Violin Sonata No. 9 "Kreutzer " & Franck: Sonata in A Major
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa07f6486763eba5cc8a6bd6c50659de30f4be627b332920b0b2bd0523c743c47. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY332303524.
Duo Concertans, Op. 9 No. 1: II. Allegro vivace e con Brio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3541d0fc41b53b7c0e6bd87e91886cc3a2f8132809539a149b55e524c12d013. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY332303525.
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
Duo Concertans, Op. 9 No. 1: III. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8299d54a61c88233e03ea4af2310559907a2387e583636862fd0be736908d989. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY332303526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5251df7bab9bb2168c857788d401fe2b766d479b77c7d3fa17ac0887dae494ee. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY332303528.
Brahms: Quintet for Piano, 2 Violins, Viola and Cello in F Minor, Op. 34
Concertos & Symphonies of the 18th Century
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a9d90976eb4fa213a2eb06a23e79eaf31b65507f913be72be17ea8595ae5f8d. 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/IT7152013003.
Paganini: String Quartet in A Minor, MS 20 No. 3 & 3 Duetti concertante, MS 130