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 0x4159b6148ca291091a6285befd81d8715bd4fd08e9aaf661fe4ca9ef35182606. Chain 2 (Bitcoin): anchored in block 953699 (2026-06-14T22:00:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/749e39ff-71a7-46f7-aa10-6a492df95f2e.json and https://artists.proofprofile.net/proofs/artist/749e39ff-71a7-46f7-aa10-6a492df95f2e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Ave Maria: Madonna Mystica - Bach, J.S. / Handel, G.F. / Schubert, F. / Bruckner, A. / Brahms, J. / Liszt, F.
Charpentier à la chapelle royale de Versailles
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 0x8e6c1e63b2da563d762cb0ac934c5fbbd2550147c4f1fd798f702f7cfb5d7448. 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/US6R21498923.
Prélude pour le Magnificat à quatre voix, H. 533
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x235dc7990d58fba3b024d390b91fcd505baff898c701770cbce8aacbbf1580cc. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/US6R21498926.
Symphonie devant Regina Coeli. Prélude à trois voix, H. 509
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb54c418fe7ec4ca366a51dada02181ccd55dce7fdeba77299d37959de3b45d7. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US6R21498920.
Missa assumpta est Maria, H. 11a: VIII. Et in terra pax hominibus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x245a8375a1cf8a40f44b57fb45bf7a1c95020ba3238ac0bff2f58b1e84c01c1e. Chain 2 (Bitcoin): anchored in block 960311 (2026-07-30T20:45:02Z), 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/US6R21498937.
Salve Regina à trois voix pareilles, H. 23
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b4d4bc144a7ed8dbdd1f25993bb396a61291a8e5a79d88dd80bd4d6ab6cc6b2. Chain 2 (Bitcoin): anchored in block 957048 (2026-07-07T14:18:56Z), 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/US6R21498924.
Canticum in honorem Beate Virginis Mariae inter homines et angelos, H. 400
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x233afbc5da7b0c51ebc66b75e27907c7eb9b5062b019f401e5361994eb444238. 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/US6R21498919.
Stabat Mater pour les religieuses, H. 15
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb3edfb60ae0ce6f2ebf9b4bf3f57dba9778bfcd8c97586729087c0549ebb5a8. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), 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/US6R21498928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e925cd364e3847bc77e04d2dfc7e436561e46ace37220b7d234901996a8fdce. 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/US6R21498921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xceca8f4744230d7872a75b7f9ec4152498a3e6ee05c1c3adf33f26821f709017. 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/US6R21498922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cb7e1992baf4c8763335f670fc42e0f5b63a21f0186b3cdb216016da43c3385. 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/US6R21498925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8192029ee3a0e322edf64f2d073db5ae16108b7c5f79007991f7ecdfdb538629. 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/US6R21498927.
Litanies de la Vierge à six voix et deux dessus de violes, H. 83
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e6eb812c25ebc15b9ce7bf06b0d1f4d763760ce25729edc8f1a799e647f3838. 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/US6R21498929.
Missa assumpta est Maria, H. 11a: I. Sinfonie devant le Kyrie 1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23cb3be35250d760eb7bae707d7d976e75466eaf00a8aaaa8d6be05fe32183f4. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/US6R21498930.
Missa assumpta est Maria, H. 11a: II. Kyrie 1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe26198798e7f32c4e86cc9c49f90c3b012264599b80a78eeaf22b9223810daed. 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/US6R21498931.
Missa assumpta est Maria, H. 11a: III. Sinfonie devant le Christe
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16153e913512383d81904ef5e69058b7df4e7987bf0e596af299fbcb7d46f380. 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/US6R21498932.
Missa assumpta est Maria, H. 11a: VI. Kyrie 2
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b9bcdf48a5389045cf5b4fdfc2680f92f212338586ad0512ab3f261742fd0ff. 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/US6R21498935.