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 0xa56fa27d3b93378358a6afe35a682f8c7dd5fb8c41581e3ffbf6eb3e3978d4e9. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c9961f70-a9ff-4913-8cb5-ddf4fe009cc8.json and https://artists.proofprofile.net/proofs/artist/c9961f70-a9ff-4913-8cb5-ddf4fe009cc8.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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 0xf218989615c78ba71e560f6c016b4749c11b6e6ff338d7a8411f6f41da1886cc. 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/NLY331208599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x002c8da3aa0e6d8e83c81269fac7063c96f9cb23e0dc43e18885b7a1b2a91870. 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/NLY331208600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56a0c4514214f768eacc54496b3f3d97e7713f44b87b475022cf2bbcdbd390ca. 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/NLY331208602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f0b2830f667507846e785049fcbbbf4e3d7631651c4e75429f2b45ff8ae21bf. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/NLY331208603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ac6286fd49c998a51847f87ecf694f01573cd97ac2345ed8c9cb98d91e69dba. 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/NLY331208610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f73dfd5151ea142264bf12348103ab8f96498d189b7efcd91d2f3c6537feb86. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/NLY331208601.
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 0xf8762646f9fe17359db9131d06ad7cd39099ab263d10550bccb50175d6ca0f8e. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/NLY331208604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86a5e7188d535f87ba3b225002a5011c543f580e6a2847d9a61a038ae66fb2aa. 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/NLY331208605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d7039e4f490b2199abffcd729b18f79efeb36d5d668daad17f6531184726e15. Chain 2 (Bitcoin): anchored in block 960456 (2026-07-31T19:53:57Z), 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/NLY331208607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef4418ee939046ddb1f97acc3dc66599eb11abb9d66c028a86a653461d292fed. 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/NLY331208608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe9da0aa4aeece77e3f2bdd061e5313cb523ae19a1ae7e2c2304218967207a23. 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/NLY331208609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffd645b6c75992e6e4e078ba6b31f8a62e6a0c251ca7fd42e0c673bb336d0a92. 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/NLY331208611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x886e05602449c287272c548f300d4251973afb70b0adf33ca0f9daacee6a11ed. 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/NLY331208613.
La Cavalleria de Nápoles, Con Dos Clarines
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb830c081d58bc3a1e06326ce574f9daa62371919ca9a8afe8a30a78619e5d021. 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/NLY331208618.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dfcf816b44fb70b3ebbace80f5e0f08dd001493f766695c7043892205131998. 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/NLY331208619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9843b4667f2bd147c7beb3f1666d8861e0c9da5111ba648d5008c5732d7c6a5a. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/NLY331208623.
Telemann: Trio Sonatas for Recorder and Viola da Gamba
Trio Sonata in F Major, TWV 42:F6: II. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00c6523e070c582221e367281361385ee06f287c3144a52aaed3953729eac1a4. 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/NLY332102229.
Trio Sonata in F Major, TWV 42:F6: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdea12fbf1ad5162ae08a6eddc26c7eb8e8eab033cf81776a40f23868c26781de. 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/NLY332102230.
Trio Sonata in C Major, TWV 42:C2: I. Dolce
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1624a8ac94f0f867c5c2f953ced6534374c4919be7d4aacde2a5b035cf3b3279. 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/NLY332102231.
Trio Sonata in C Major, TWV 42:C2: II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d4f6b62a9c9e73cfc94e12ada128425fab9433c625dcb553330a98105f070d5. 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/NLY332102232.
Trio Sonata in G Minor, TWV 42:g9: III. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7998a8d8f9fdc775c3215d1c3563a4b12a6cd9d7ec89e899cc87efaf7a9cd04. 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/NLY332102240.
Trio Sonata in D Minor, TWV 42:d7: I. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d8acaa3352b16e8dd043e382f0daa947c40bad197c57781b85b4c1cb0fd6a7d. 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/NLY332102245.
Trio Sonata in D Minor, TWV 42:d7: II. Vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb348beb30413a364b7c389a44b31a8b041da3cb2257f6170cf4e1e3fa022e3b1. 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/NLY332102246.
Trio Sonata in D Minor, TWV 42:d7: III. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa74d475a694c8c5406a1eb0458b8db9a88960cb1bf96c5012db626b895545a00. 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/NLY332102247.
Trio Sonata in D Minor, TWV 42:d7: IV. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28aff831384dfe1cf0158ba6fa88b7c03fb112a3d699755702f9250b1fb6d80b. 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/NLY332102248.
Suite in F Major, TWV 44:6/55:F2: I. Ouverture
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a9d72cfa3cc122726ea7fe95638f81453c14eeba92d04f3e4a12d30bfada46b. 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/NLY332102249.
Trio Sonata in F Major, TWV 42:F6: I. Vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a9223b439d7a4340f095f2ce015ef7ef0465bfe19076baea068e75eb654f869. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/NLY332102228.
Trio Sonata in C Major, TWV 42:C2: III. Grave
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28d3bc286c4157f30868fc8379cf964bfc8acdbed29bf7f5bbd387a90ba3d6c2. 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/NLY332102233.
Trio Sonata in C Major, TWV 42:C2: IV. Vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb297e427508e54841a5fd7bb19312bfe1ff92419dbf53bd69338fff361b76512. 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/NLY332102234.
Sonata à 4 in G Major, TWV 43:G10: I. Vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ce4f30917ab6e6d1191d1b793c65b95a51b454b0ca2ec632f0e9fb78d7c9246. 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/NLY332102235.
Sonata à 4 in G Major, TWV 43:G10: II. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb54a8a402f4396ddc7b81b95c2c616f1355cdd707a0e70215403a4d2a2e99c8e. 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/NLY332102236.
Sonata à 4 in G Major, TWV 43:G10: III. Vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa46d7acdcb1645e9031a8f7fb8449bc77395bc5e41d1188f8ed22aa23f2946bc. 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/NLY332102237.
Trio Sonata in G Minor, TWV 42:g9: I. Suave mà non adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x625113bcb3c06102b39de4de5f3c77a60df24eade6416dc69b21e9b461d71795. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/NLY332102238.
Trio Sonata in G Minor, TWV 42:g9: II. Vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dd8c132bbf2e3c810e34a6b40c892266e484182872ba260d3afb37e90b61ce6. 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/NLY332102239.
Trio Sonata in G Minor, TWV 42:g9: IV. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5db1594ab3c5045d3c22f3a087593e215d5a973647312d46199171b24f60cc3d. 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/NLY332102241.
Trio Sonata in F Major, TWV 42:F3: I. Vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2018fdda748132634ac54bccf67644fc88517ff2f460b9dda923fc634bf2833. 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/NLY332102242.
Trio Sonata in F Major, TWV 42:F3: II. Mesto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30ea09e66319d26090b5e719f32c9f8fa7ab806e43d188dce9e95cbd59594aba. 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/NLY332102243.
Trio Sonata in F Major, TWV 42:F3: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafd65d90c64c7326784513eeaa9b43e87b7c4c519c9901493509b4f7c5a9d259. 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/NLY332102244.
Suite in F Major, TWV 44:6/55:F2: II. Menuet
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9b44f7c672e39df5b5dbd783e80260b27c2ead745070a6e178fefee9f1fb29e. 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/NLY332102250.
Darmstadt Aural Documents, Box 4: Pianists