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 0x92698d1160fe2900db92a09c733733b847ba076ab92e4e06c6cbd9e86942be16. Chain 2 (Bitcoin): anchored in block 954689 (2026-06-21T10:35:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e1c9bacc-9e96-4182-a1ca-23d99113c320.json and https://artists.proofprofile.net/proofs/artist/e1c9bacc-9e96-4182-a1ca-23d99113c320.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Crusell: 3 Quartets for Clarinet & Strings
J.S. Bach: 6 Sonatas for harpsichord and violin BWV 1014-1019
Sonata 4 in c minor BWV 1017: IV. 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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc599f12ab9f73c7a3e78c2f59c3f68f0bdf1626d209d195f8a6ab5947211585a. 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/NLK171200037.
Sonata 2 in A major BWV 1015: II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47427307e5156dba29af7e3c977875445d1d4aeb0aee0a552528e75029599ef3. 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/NLK171200027.
Sonata 2 in A major BWV 1015: IV. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e9cb61a13aa73f522229ec586a86b66467534c530bfcfbf75f608990cb10488. 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/NLK171200029.
Sonata 3 in E major BWV 1016: IV. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x464c3b6d06cbdfb4f4b863d922cb95181b60529aac83d2d9a30397003c9cc848. 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/NLK171200033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29ff9f25919e5e630dadc8bdf32b1c7234caa85d58029d0855c54b3d42003edb. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/NLK171200022.
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 0x43a1eab6511ac77dd5fa2af45472a366eb9f12a59616656842c086735e886d86. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/NLK171200034.
Sonata 1 in b minor BWV 1014: II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3df8f7f64208fe8407bf3672cbf3e999e2d3021dd2bfddcd6fe2a1bbdab477a. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLK171200023.
Sonata 4 in c minor BWV 1017: II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x592eb4ebbf395ccf05ae1b4851a4d148c3b47c227966079d0a88f80367c2f175. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/NLK171200035.
Sonata 1 in b minor BWV 1014: III. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb604f7f4fe8c6232e95e916569f3ce18f8c04410d0f349c9ea85abc271bd8a0e. Chain 2 (Bitcoin): anchored in block 960306 (2026-07-30T20:23:53Z), 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/NLK171200024.
Sonata 4 in c minor BWV 1017: III. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x742ce1c0aca143516da252ed99c52ce845bc42c41ce4828ce678fc777d377343. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/NLK171200036.
Sonata 1 in b minor BWV 1014: IV. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84945ac3ad814e25b1fd73ea607de27d88a0caa72d560515f6740538b0d771b8. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLK171200025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8210fc7fbde4dfc4eee0fddd930f9bf39851badb020c607d3b96ae1b3fc48915. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/NLK171200026.
Sonata 5 in f minor BWV 1018: I. [Largo]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf07e920dd086b1e86840a008508443ebf09c532d2d57a2eab518a0dcef37066. 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/NLK171200038.
Sonata 2 in A major BWV 1015: III. Andante un poco
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadcd64307f1866414c4244e45131bd829dc45f020bdd6c1fd89f0beef5b93028. 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/NLK171200028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x028d26fa073d0f1ce446421f89f938dbed3ae528583f9c06b0e9d70870fe189b. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/NLK171200030.
Sonata 3 in E major BWV 1016: II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda17d482d2485739b700d6566f965b67bcad8b44d9ef278966ba95cb27700e4a. 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/NLK171200031.
Sonata 3 in E major BWV 1016: III. Adagio ma non tanto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed2173bce938e854df7e56f6cf56847438bf9c2871e477e904b73a752574261d. 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/NLK171200032.
Buxtehude: Opera Omnia XIII: Chamber music vol. 2
Thematis Regii Elaborationes Canonicae - Musikales Opfer, BWV 1079: Canon a 2 per Augmentationem, contrario Motu
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3cbe878049601a9c61e49927a47ee4b5cf0790f1b6604ef0b68728185875d9e. 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/NLK170800063.
Ricercar a 6 - Musikales Opfer, BWV 1079
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccfbc486c7c32f973e67bf1bdac9016723bd57425bb402a3aa0d75011ba6efcc. 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/NLK170800074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5824d9ae17cb0a97bb52ac7049c896e6c9dd8d20a5df5642d4efeea3ecf310e. 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/NLK170800075.
Vivaldi Recorder Concertos, The Four Seasons
Organ concerto in C Hob. XVIII:1: Moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ee3c1557910ac2d955a0437e15d376f45e74a67bb8201904c586ee33512b8d1. 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/NLK171000017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b017997805267219f5d70d0103429060cb42bea2e74bdf279cbccedb0e5f6ae. 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/NLK171000018.
Organ concerto in C Hob. XVIII:1: Allegro molto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9479c5497b3674ff37d42469bc189d55bc0f53ade9f7c6fc52f217bcacff73ff. 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/NLK171000019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba8f8696b0dcb5bf915955f38aaabe35837dcf7f3d5317e1e86438ebd7ed6ac4. 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/NLK171000024.
Concerto for organ and violin in F Hob XVIII:6: Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4a430fa1c9f1f4fd6e26dbbaa291505e5eefd90e90795abd6b026a2756c11fd. 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/NLK171000022.