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.
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.
Darmstadt Aural Documents, Box 4: Pianists