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 0x3366b3aaf6230b074936d14424c103a584898aaad63b3b56f055c170a439c64f. 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/9cec037c-8e0d-41b4-81a2-e1415dfa219a.json and https://artists.proofprofile.net/proofs/artist/9cec037c-8e0d-41b4-81a2-e1415dfa219a.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Folk Tales, Vol. 2: British & Irish Miniatures
Berceuse, H. 8 (Version for Cello & Piano)
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 0xed1f945956e680a43c14d6cc890e1933494f9b74370d4551ce93dac1139d7f51. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI192315401 — a six-check JSON result.
Serenade, H. 23 (Version for Cello & Piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4993fb6f149e72e27f33b624b6c62e82a85dbfbc76641ccda862347bb325d6c. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI192315402 — a six-check JSON result.
Elegi, H. 47 (Version for Cello & Piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd92e98319007b5b80716a85050fe8c1a510c9f5a0ae1639294d17a3805e29c31. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI192315403 — a six-check JSON result.
Salut d'amour, Op. 12 (Arr. for Cello & Piano by Anonymous)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27d848e25f933c46bc2da606dd16e116b8ad2b655f93ff8c28260b4a3105cb7c. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI192315404 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0337f45a8bba63a27c26ca12be5c03dfc23985099b69fa13bbcd1395d292b687. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI192315405 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4aa3eed35c470769da28cf88c423c7516b2f772ac17e3b6059d193d9cd8d0633. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI192315406 — a six-check JSON result.
I'll Bid My Heart Be Still (Version for Cello & Piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56a70bd907e6b8c41484a265264ba0b04e9ab9630a0ab9e2284e8d974f88d7b4. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI192315407 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72cf3c3c961bc11c7830ee3190c62e81a933052447731850271d15750094db41. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI192315408 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e2ab766a0b5cd98c259b6f67723367c2585f34e4fc3f8fc287f2048f32745c0. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI192315409 — a six-check JSON result.
Spring Sorrow (Arr. for Cello & Piano by Julian Lloyd Webber)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05d78b966833e30b1da581cb2058325a5603c8db428e4cba5dbd0f60d5bdd2f4. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI192315410 — a six-check JSON result.
4 Preludes: No. 3, The Holy Boy (Version for Cello & Piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6255d24bf98a37e436cc811ce4ff631c97c1988add9aefb27f2eb53645c524c1. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI192315411 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe591310e90f509c13256b81ad7d988cbcad6c6c386b355ffa716548bc214be44. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI192315412 — a six-check JSON result.
The Last Rose of Summer (Arr. for Cello by Gerald Peregrine)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecd5169fe0cba9ffcc33d3d345399fcb284a3c5415a6689820f55045089baab1. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI192315413 — a six-check JSON result.
Down by the Salley Gardens (Arr. for Violin & Cello by Lynda O'Connor & Gerald Peregrine)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa549a1c44964fa3815b97237903fbc2fceb29455ad7b9eebef7ababcb521bc83. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI192315414 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeae0964f1e64fb25fdd8c8ac431d6225d894a838e2b8f16dfcfac0a99a2282c8. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI192315415 — a six-check JSON result.
The Coolin (Arr. for Cello by Michele Esposito & Gerald Peregrine)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dbb5a5674cccd4f3cbbbe3c24a7df8e83bf38df075305e317982ef4d58395b7. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI192315416 — a six-check JSON result.
She Moved Through the Fair (Arr. for Violin & Cello by Lynda O'Connor & Gerald Peregrine)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x327854787a7f8935ef42d35cf258d1982baba39957ce04b48ba1e0ae8eeafa17. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI192315417 — a six-check JSON result.
The Lark in the Clear Air (Arr. for Piano Trio by Thomas Christopher Kelly)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3df6fd9f48204de8ac93d7f87f960dc342ea2924599a423b8fb47714a8daf7b4. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI192315418 — a six-check JSON result.
Songs of Travel (Version for Cello & Piano): No. 1, The Vagabond
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a669a962b93008ba6141a4c65e1607da7f0f49fd2170d9bcc1a486b8ff4c219. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI192315419 — a six-check JSON result.
How Can the Tree but Wither? (Version for Cello & Piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc513d6724a45397fa5ed6d4ac948aa41eee310a885874c687ecc053c419cba8a. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI192315420 — a six-check JSON result.
Songs of Travel (Version for Cello & Piano): No. 7, Wither Must I Wander?
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b3122086dbe54055030b319f679677020446238b082c8bc663ef9df8bbebb7a. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI192315421 — a six-check JSON result.