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 0x8d8e5741b4075f1405ddfb6ff1aff043fda17c40a5847e955753b2e2acc370ea. Chain 2 (Bitcoin): anchored in block 953827 (2026-06-15T19:59:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/da725a47-fdc8-4904-bb4b-0013444819e3.json and https://artists.proofprofile.net/proofs/artist/da725a47-fdc8-4904-bb4b-0013444819e3.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Chansons D'Enfants Sur La Harpe (Versions Harpe)
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 0xd36316c3fd38f9df6a9a14fdb56bc328246cc77ed524e09c06d9df0d7541bb7a. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/DETL61401200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a58068ab93ade1dc9b75bd67329e5da68aa5a495e0e3e343cc1f7eb18f38200. 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/DETL61401186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cccadd7602e7c27900af1833552a57c273402de5113923f35fe32f817fdf5e7. 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/ESA122436831.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf56ea90096375c9df34742f24341aa9761029cb3711c46326da505768a9a453. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ESA122436832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47f7152ee3021ee543895fe53ad3ecc64401c7cf48672e04e77bd730a3069b93. 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/ESA122436833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa90f7caf25f8575debfac167aa582a62b52fc66ed34906e99df67049e4e7a36b. 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/ESA122436844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6645790c8a482b9095199464cec2903806a5747758a9ab10fb468ecf7607b6b. 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/ESA122436846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4e9d8df4ddb2ddb602d5d41310b193fd64b662013ea0d34aac8985085f8ac84. 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/ESA122436847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7375353bb98d499242bfc23fa2f1c9c3416d3c6b8e6d28553ae78b6e3e126ef. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ESA122436848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5cf08bde075dc200928609fdcb4d4000bdae3bfb36072427fe7d7d32b3e4e51. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ESA122436849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20b4e244f43346cb4995d4c2afae78e47df8f133c131f97cbb0ebe73091918d7. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/ESA122436733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b1c27885461cba17a869f8404e1139b5aee240d96240e24499ce27362ed95f3. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/DETL61403589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dae799adce9b34c5862e064c75adaa30477205df244c3ba63bedf9717d0522e. 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/DETL61403594.
Savez-Vous Planter Les Choux - version berceuse
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32ce74fbe8dd18281a5e37979222602fe1d595624ffbfcf4e714f244929ff649. 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/DETL61403603.
Berceuse Tranquille à la Lumière des Etoiles
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x045a95cca03273bd256e574f0adf647f95c160eb62585bed03ec7d00ff7dd265. 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/DETL61625558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cb6311f938c2de96c857554b9af2773f2e5fb9821a5a56363355f22fd84ce00. 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/DETL61625560.
Faure Berceuse (from the Dolly Suite Op. 56 No. 1)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaaa032c4b0c79417dbca15a4f26f867b61006d49da41d87fcc86ac0296bb0788. 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/DETL61625561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x244aa7a5e45113e3f2a18f525044fb015aedfe06079397c0a4db1bf267bf888b. 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/DETL61625557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c702d8c72830db1d1502565f42b65c396da546cd9ea08d97363012a5c034a8a. 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/DETL61625576.
La Poupee Berceuse (from Jeux denfants) (Bizet)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1f54f191e5de0cfd8f7b240ad8e39bc4815cdbf100397b1d100c35de382466e. 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/DETL61625562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1205a340b2f3c18006fc5e74b98735ef48a88aeab9f27ecc56da1f6587987783. 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/DETL61625559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x855edf683951c7be15c0a319b536a6b73e8c233b94c14ca9188006eb95819e1e. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/DETL61625563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x125e954f709eb598a69b189b22fed02bb146ad27478d257557acc232543feed3. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/DETL61625567.
Une tabatière à musique (Valse-Badinage) (Anatoly Konstantinovich Lyadov, Op. 32)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd2638d407f9ba0a88f7817b6264c0a5ca03f0956ab1821e944483f787e901c3. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/DETL61625564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cb26761ce5c0b09c047342a53e917b3a928271979f1e447a7f6794f57094c69. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/DETL61625565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe8ba5109a4dc20c8adb7074e201f389bdd694d7cb9147b830a5f559b3db5b91. 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/DETL61625574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e31fb1d367fd9bc2a037ecff4dc942aaff435e08da032841f45dc62dedbe8c9. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/DETL61625569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a43226db1bebd5cec28fa1779f5d4a718c5cd7fac3ebbce92b17332798cd2e8. 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/DETL61625568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2343684b3a6437cd7fa4c2bedc9d9a3b6962af3cf34c64052d2d8722bfabacc2. 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/DETL61625571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81c6c1dc66aa88a2809691869e279beeda663bdc0b5d8382b549b40bb2dfaad3. 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/DETL61625570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x186c7d2e0157d7408d13b9e53f65f81e38d4f07c0d16c236b1dffb71d00a63ba. 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/DETL61625572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9382bbf155f59cbf4ee0234050505cf351e2a0205c88acbc0e797d269a20af54. 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/DETL61625573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9973348c96c2a625f33b7dfb0b358387c4a86d0b0e0737c5adf740813859e25. Chain 2 (Bitcoin): anchored in block 960404 (2026-07-31T13:06:57Z), 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/DETL61625575.