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 0xc529a5f43526df7f925d01906692e96cc22cd91eb63a8b04661b02e3cb13e550. 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/83304055-80ae-45ac-bd1a-019472386355.json and https://artists.proofprofile.net/proofs/artist/83304055-80ae-45ac-bd1a-019472386355.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Music for the Royal Fireworks, HWV 351: IV. La Réjouissance
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 0xa8acdf439bf48f3d3e70008845179f2f15fae51968ee77e924a0a8ca1072b92b. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLE422301326.
Concerto Grosso in B Minor, Op. 6 No. 12, HWV 330: III. Aria. Larghetto e piano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa54c35a91a7783c2fbc6b7e91a88eca16b5bb4a0f8493f6845d40343c6f0c342. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLE422001130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fb72a8a63a57f1e9ade445ecda1017d12304da28a10a4ec57e2a983f47b2301. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLE422105533.
I Will Magnify Thee, HWV 250b: I. I Will Magnify Thee
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2059d38c1ce82c55152767774952e9c06f6ce8cf82185f1e1a234cb825f40b05. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLE421701117.
Mozart: Paris & Haffner Symphonies & Oboe Concerto
Symphony No. 35 in D Major, K. 385 "Haffner": I. Allegro con spirito
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x837541e76235295457a02740b0d046cbfaec43f96a3463358be1cb4522d617af. 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/NLE422305901.
Symphony No. 35 in D Major, K. 385 "Haffner": II. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09088c1cb174ccefc4f1f3d4adec32d1fc1e7664e88f03e77d72a30cd0def325. 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/NLE422305902.
Symphony No. 35 in D Major, K. 385 "Haffner": III. Menuetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb627bfaf3879a1d1e094922462d5f19682341ad7e86fd34a70ba333c73921535. 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/NLE422305903.
Symphony No. 35 in D Major, K. 385 "Haffner": IV. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b29d68b5943832fb83942c73d168acf19aaeedbe6e37778aab72820db7650ee. 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/NLE422305904.
Harmoniemusik of Die Entführung aus dem Serail, K. 384: I. Overture
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7275753d107f26e20dddcef2956b631020ac553fb7e1935cf2f3a74d61794f7c. 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/NLE422305905.
Oboe Concerto in C Major, K. 271k/ K. 314: I. Allegro aperto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4702a3a346739b7a78a9e0a464b7904b9cef5b4a74830501a217250e61b17025. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLE422305906.
Symphony No. 31 in D Major, K. 297/300a "Paris": I. Allegro assai
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd911af7b6dc6a7ec44921f0bb884220aec8ca41e91b07ee8e56c369a54a86f10. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLE422305909.
Symphony No. 31 in D Major, K. 297/300a "Paris": II. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45a77e916c1f059ba448f9d312b42a62b07d1224f79139f2dcf79c11b671b41d. 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/NLE422305910.
Symphony No. 31 in D Major, K. 297/300a "Paris": II. Andante (first edition)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21eae57d285b2e53eaebf0b7e3b0a4ccaa5450e97eb0a90c4144318e418e2537. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLE422305912.
Concerto for 2 Violins in A Minor, RV 522: I. Allegro
Vivaldi: Concerti per archi (Concertos for Solo Violins & Strings)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9490ab607523cfd06eb478525e7c8053a185436c9f8db57bc15e0a0a35010b2. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEAQ70700057.
Concerto in B Minor, Op. 3 No. 10, RV 580: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff5da3d5bb1a06e2560d65515e7d988a50a08464437a8b238e2afc7990feb9c5. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEAQ70700065.
Concerto for 2 Violins in A Minor, RV 522: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9c89354474fb5f07473db27c018342b97313f57123c654fdc95f336a2927423. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEAQ70700059.
Concerto in B Minor, Op. 3 No. 10, RV 580: II. Largo, Larghetto, Adagio, Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4099e49a75e842bda7248c0eea54fda59a5ec3b681a18d7d1cb4c82088348a75. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEAQ70700064.
Concerto for 4 Violins in B-Flat Major, RV 553: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cb7468be80a61022bd5ab2ea3346409d781e288f63da06f245ffccc8fef3638. 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/DEAQ70700051.
Concerto for 4 Violins in B-Flat Major, RV 553: II. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3a0cf375918cd168a248199ade64f81e7170eb023f576c77e1578b230cc80d3. 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/DEAQ70700052.
Concerto for 4 Violins in B-Flat Major, RV 553: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe918976b63d15afdc9bd4acfb23399553174b891b540c301d70b9b42f4f6e0bc. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEAQ70700053.
Concerto in B Minor, Op. 3 No. 10, RV 580: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c831542f17eba62d3687bb24016d057434f0c0f66ee526e39f6b68d56b6cf3e. 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/DEAQ70700063.
Concerto for 2 Violins in A Minor, RV 522: II. Larghetto e spirituoso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f2a81175d5beaa68133962725a132b77d34c80f2ddc203d30cb3155706f9969. 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/DEAQ70700058.