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 0x514fd6f7bc67ba41eb8c9f8b4f85716ef48b6ca394c6006d377981d29b68d5fc. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/693c4365-9cfc-4581-865c-7ecdf7d51cf2.json and https://artists.proofprofile.net/proofs/artist/693c4365-9cfc-4581-865c-7ecdf7d51cf2.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Duo for Violin and Viola in G Major, K. 423: I. Allegro
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 0x1373f56c2639d68bc1bb2fed0e5095bcef6ec7ab9e873ebae04cf10e78786a03. 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/NLY331604446.
Duo for Violin and Viola in G Major, K. 423: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bba02f83be50f474e1a8b4ee281d875b0c4446da659bd3f21999fc587548cd7. 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/NLY331604447.
Duo for Violin and Viola in G Major, K. 423: III. Rondeau. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67eee43cd572e6b2d0cb39026c0ae3aae74235578c037575343e843225a70699. 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/NLY331604448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfc5cbcb36d9726a287be9f34e68216dbf0dd53c47f4850347777cf38538bec1. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/NLY331604449.
Duet for Violin and Violo, Op. 13: I. Allegro moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5f42654dce57f1e9931c7699f4d7db6e2f366d55193acd235a5bbf1ae828d6e. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY331604450.
Duet for Violin and Violo, Op. 13: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd233d2c82bb4d30061a7d68cd4708036162f80c45b3625ee1ccf92c0a41aec5c. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/NLY331604451.
Duet for Violin and Violo, Op. 13: III. Tempo di menuetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83a3e8c1e7d66840449e31995a2a767b1e0a5e0d9f3277a43b6266203a0db2b2. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY331604452.
Sonata a Duo: I. Allegro, piuttosto moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5773fa045efb8693846c8dcdb8d83b75a9cc364276ea3a0e2a1ddc2c96547a0b. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY331604453.
Sonata a Duo: II. In tempo di sarabanda. Andante espressivo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36dca2d328aae55b224c55a69023d193fd369eae79a3900d6f8c8e7b73e77af9. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/NLY331604454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac6859d87acfe05927deb527c8ddad5206cee452fe34bce91cb1a61d4833a05f. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/NLY331604455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc57225de83d4f135256878846c3f172ab9be6365c6c14589c1b6e0371a40a7e2. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NLY331607175.
Symphonie concertante in B-Flat Major, B. 112: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e7563b4e82c28b6cbe403832e75612a447897e7317f4f093d8a231fc19a1ea1. 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/NLY331604438.
Symphonie concertante in B-Flat Major, B. 112: II. Rondo. Moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf9c897c6a236dbe7aff198aa90299599f59962dcd478fe546e5e6d8272c06bc. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY331604439.
Sinfonia concertante in E-Flat Major, K. 364: I. Allegro maestoso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18650fe639565f5a9d6ca69d04763df2a5621da7d59f440a16ac35bb81a9cb77. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY331604440.
Sinfonia concertante in E-Flat Major, K. 364: II. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc62d028c990dc03d79757ec11c936e1429acce5f4f95e37cbcf8c08800e555fa. 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/NLY331604441.
Double Concerto in E Minor, Op. 88: I. Andante con moto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24aa8cdd13a86e7691f45661070d6a4de18a98f87730f94fcd09e36064bb5561. Chain 2 (Bitcoin): anchored in block 960187 (2026-07-30T01:34:28Z), 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/NLY331604443.
Double Concerto in E Minor, Op. 88: II. Allegro moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5d496473b79b0ef108070be3b60586c775f0fa21a8b23d0138c773b45b41eed. 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/NLY331604444.
Double Concerto in E Minor, Op. 88: III. Allegro molto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59d0aee0eba2a8f9014edad03c561e7a5b3cc6a7a8d7b9dd393ec46c75937f31. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/NLY331604445.
Camerata De Coahuila: Ponce, Copland, Bartók-De Elias, Moncayo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfde2cf75e5d80a6dceba8b29254be51a62dcf9684c7b8ef1c5bdecdc10c01cbf. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/MX2831201065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ec6aa3a47799113afb6d3f37fcfa7c821e4c79bb948620ccd321a300a93ace4. 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/MX2831201067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc11ebfdc2334291dbab1cbb138555eb28ffa234d37050bba5751d0c3a499aa8f. 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/MX2831201070.