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 0x82f7bbb61d5d734384070f41bb190565008518f3b28178d3abc7d9bcd5ae28b8. Chain 2 (Bitcoin): anchored in block 953750 (2026-06-15T06:12:23Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a7291a7a-fe34-4cdb-ac36-b830c7631210.json and https://artists.proofprofile.net/proofs/artist/a7291a7a-fe34-4cdb-ac36-b830c7631210.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
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 0x4e481eec362d8d1a30b48bae290d84f7bec94c75dded8a77539cb33bb4104d6c. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/FRU622362401 — a six-check JSON result.
Mélanges à 2, 3, 4 et 5 parties avec la basse continue, Livre 2, RISM A/I/2 D3701: VIII. Allemande pour l'orgue ou le clavecin, et pour trois violes si l'on veut
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9536d69ca04b3abcf8e6d810bef3a5cb2a1f7cb08a432f18f40690c27768392d. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRU622362402 — a six-check JSON result.
Pièces de viole, Livre 2, Suite No. 2: No. 38, Cloches ou Carillon
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x070790959331cce722b7f6b4979cb8e09afe1461cbe7c336dd077dfba88b4ac8. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRU622362403 — a six-check JSON result.
Pièces de viole, Livre 2, Suite No. 3: No. 63, Les Voix Humaines
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d6150867aacc9e6f48389f91da9395a87b8f1cdedfdbb92a54c729d34fb4238. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRU622362404 — a six-check JSON result.
Bauyn Manuscript, F-Pn Rés.Vm7 674–675: Pavanne de Mons. Dumont
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5075e32fc52fe4592045d57e66006e300c21e7b8756e06e54db929ae17885bf4. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/FRU622362405 — a six-check JSON result.
Pièces d'orgue pour le Magnificat: Récit de tierce en taille
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3120d965fd51dce814346fd5efb1e17f35753ae7283e29d1fcd5b9e0449a0c5. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/FRU622362406 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70791517800212d8a6a5bb35a9bdd92c5bbd5bb26e8bd3c9c6147bef82617e76. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/FRU622362407 — a six-check JSON result.
Pièces de viole, Livre 3, Suite No. 6: No. 82, Gigue la Chicane
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48627d52d1dfaf2b9a926e869b1dc6c7444fefc577c0f98b6dc241dc4394b8a4. 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/FRU622362408 — a six-check JSON result.
Pièces de viole, Livre 3, Suite No. 6: No. 86, Plainte
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4602920df13a288e928d5e20815270e8a5a8c9afb5182a924372989775b4ab9. 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/FRU622362409 — a six-check JSON result.
Pièces de viole, Livre 5, Suite No. 6: No. 83, Chaconne
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x314ba1095dadb6a304b04dbac65e9443ef42d6a2b9a67672a9fd61b0d31a03e3. Chain 2 (Bitcoin): anchored in block 960198 (2026-07-30T02:21:55Z), 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/FRU622362410 — a six-check JSON result.
Pièces d'orgue pour le Magnificat: Dialogue
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9aac8ed3c671dc6042b96ebff51f4bd43e0e595b44c583ef59dc11b95f11035. 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/FRU622362411 — a six-check JSON result.
Pièces de viole, Livre 2, Suite No. 7: No. 116, Pavane selon le goût des anciens compositeurs de luth
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa85ca177feb047705716f1323744d9f495d586329efd454e7fcecfa5202684d7. 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/FRU622362412 — a six-check JSON result.
Premier Livre de Pièces d'Orgue, Suite VI: No. 3, Récit de tierce en taille
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31618c1889503fa6fb89d0c5a19754333a3748d79c0aeceb969c4ea539d04d75. 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/FRU622362413 — a six-check JSON result.
Motets à deux voix, avec la basse-continue: No. 33, Allemande en tablature d'orgue
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32b85551c5d85b5c8431eadaa00d1ecdc11fe3ca113d7b4103787fac78f5b831. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/FRU622362414 — a six-check JSON result.
Bauyn Manuscript, F-Pn Rés.Vm7 674–675: La Piémontoise
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe89801a5a3ed129d23f4394ae4f7c30d2657f09e49b03ab6261b958fffd7c743. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/FRU622362415 — a six-check JSON result.
Pièces de viole, Livre 2, Suite No. 8: No. 131, Sarabande
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7666c817057ff780646e3848362fd371fbdb7e8ad851f63769b43abbbf686eb7. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRU622362416 — a six-check JSON result.
Pièces de viole, Livre 5, Suite No. 1: No. 4, La Mariée
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdfd53172a0d9d6b4c00b39234ddc87f11ab97a2a00860ddd5d22d2c1a5b4402. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRU622362417 — a six-check JSON result.
Pièces de viole, Livre 2, Suite No. 8: No. 142, Fantaisie
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97bea771e466b6b3a71e5a5bc41fd05b552e44099bf2741b429c2f1b72fbbc27. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/FRU622362418 — a six-check JSON result.
Pièces choisies pour l'orgue: Récit en Ré Mineur
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95e3182539fbdfd0587fb3b71c3ae880c7935a89e91294553753da1dd26dedd1. 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/FRU622362419 — a six-check JSON result.
Livre d'Orgue contenant une Suite du Premier Ton: No. 5, Basse de trompette
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28185060bfa700478c263a4137aa4f1297f8647bfbaa224ef210019b7352b68e. Chain 2 (Bitcoin): anchored in block 960268 (2026-07-30T14:53:07Z), 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/FRU622362420 — a six-check JSON result.
Bauyn Manuscript, F-Pn Rés.Vm7 674–675: Sarabande de Mons. Couperin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ed2a9f39019e10e761ac9a474bfdc4bc354ee4491b8ac19b7da4bc50a08e7d6. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRU622362421 — a six-check JSON result.
Livre d'Orgue contenant une Suite du Premier Ton: No. 1, Plein Jeu
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12c888bfa373c247eb36b4f853c675f327a8900f2381ad135e0856f4c6472588. Chain 2 (Bitcoin): anchored in block 960187 (2026-07-30T01:34:28Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRU622362422 — a six-check JSON result.
Pièce d'Orgue in G Major, BWV 572: III. Lentement (Transcr. for Viol Consort by Salomé Gasselin)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26c8ba08751f28be7a2c29337090b9491e21234c821627d0c7aa68e2e2fdebf9. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/FRU622574403 — a six-check JSON result.
Sonatina â Viola de Gamba aut Violino, CZ-KRa A 891 (Attr. Heinrich Ignaz Franz von Biber)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05d31a21bb3951b28848a9e8935f674e662ddf57b9d46a48b5d166a09d04af58. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/FRU622574411 — a six-check JSON result.