Ensemble Organum is a group performing early music, co-founded in 1982 by Marcel Pérès and based in France. Its members have changed, but have included at one time or another, Josep Cabré, Josep Benet
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 0x6bd94942bd48a24662559e3bb3fdd82c21987d6859475cc5497c66c448aa8d32. 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/1699a99e-3e32-4e4b-a85b-383f52d50f8d.json and https://artists.proofprofile.net/proofs/artist/1699a99e-3e32-4e4b-a85b-383f52d50f8d.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
École de Notre-Dame de Paris : Mass for the Nativity of the Virgin
Mass for the Nativity of the Virgin: I. Conduit monodique "Beata viscera Marie Virginis"
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 0x02b185556a5577698722d578a7d54d134366292656927b0f459763a25818d660. 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/FRZ149434010 — a six-check JSON result.
Mass for the Nativity of the Virgin: II. Conduit à quatre voix : Deus misertus hominis
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81d71db4dc4c5750e928ba2d92d090947ee04eaab5d9fb613ca18abc646e13f7. 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/FRZ149434020 — a six-check JSON result.
Mass for the Nativity of the Virgin: III. Introït : Salve sancta parens
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8b8b534a58fe1b40e9879900c4818562be0e3e41776c50bb42970ff448f0d2b. 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/FRZ149434030 — a six-check JSON result.
Mass for the Nativity of the Virgin: IV. Kyrie à deux voix
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6e5d534755f306222bd56f225eaebf5ebcbdb4366953aac4017226529cf47a1. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/FRZ149434040 — a six-check JSON result.
Mass for the Nativity of the Virgin: V. Graduel à deux voix : Benedicta et venerabilis
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cf82e5b829ee2706b4f077c5c883373e503217c99cee46a81d5c89de4c274cc. 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/FRZ149434050 — a six-check JSON result.
Mass for the Nativity of the Virgin: VI. Alléluia à trois voix : Nativitas gloriose virginis Marie
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0086b5a7f97d0671a40f8da7f25aa33a21db2c039c9f08a6c21c0fd782c04d9. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ149434060 — a six-check JSON result.
Mass for the Nativity of the Virgin: VII. Offertoire : Diffusa est gratia in labiis tuis
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a1351f048a10f7d23dba1043eb3e902fb73b701a8e7e1487a6dbc2b5f9f8fa7. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/FRZ149434070 — a six-check JSON result.
Mass for the Nativity of the Virgin: VIII. Preface
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54ead901ce4e91e9237b1ba9bd120e8d73297291373d1d19c957dd7aca0ad74b. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/FRZ149434080 — a six-check JSON result.
Mass for the Nativity of the Virgin: IX. Sanctus à deux voix : Sanctorum exultatio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa7bf7008cb96b961f9b566b88bc05253f8b43166784e5f071fb0ca7304bad68. 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/FRZ149434090 — a six-check JSON result.
Mass for the Nativity of the Virgin: X. Agnus Dei à deux voix : Fons indeficiens caritatis
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2505e27c5fbd64a706c2467078a9a4f288a1f9e9127703e6e1691e3110b3ecab. Chain 2 (Bitcoin): anchored in block 957067 (2026-07-07T16:54:37Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ149434100 — a six-check JSON result.
Mass for the Nativity of the Virgin: XI. Communion : Beata viscera Marie virginis
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fd0b97f2825a95d7370c9ae1d346b29f125969128f7ac48775dcb6d1ee62502. 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/FRZ149434110 — a six-check JSON result.
Mass for the Nativity of the Virgin: XII. Benedicamus Domino à deux voix
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x957451d09d0c1ef7fdb5d288ae3623674caacdde9215c0a629987c9ebdf5cd35. 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/FRZ149434120 — a six-check JSON result.
Le Chant des Templiers XIIè s. (Manuscrit du Saint-Sépulcre)
Gradual of Eleanor of Brittany: Kyrie: Orbis factor
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa27a0a34386b8a2d969947f17599acc53d66dbfee03d0282f6711ada877da0e4. 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/FRZ149136020 — a six-check JSON result.
Répons de Matines pour la Fête de Saint Bernard: "In Timore Dei"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x726dce740e6e4f1d4c851f60ceedd9d8fda3fa77f3a2fe2d697b7a56de760c42. 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/FRZ149107080 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a295d9e2b377367e1071ec5c345591fd167742877299edf8a1140eec7c3ea3c. 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/FRZ148417020 — a six-check JSON result.
Chant of the Church of Milan: Lucernarium, Paravi lucernam Christo meo
Voices from Ancient Abbeys: Plainchant & Polyphony
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3fac0cfd9997f5ddee1c4ba9ab6305d89b642e858e389c5e2f94375c27757a0. 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/FRZ148910010 — a six-check JSON result.
Chant of the Church of Milan: Alleluia - Versus "Hodie in Bethlehem puer natus est"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0efe91670c404b568df918f40bd2864080f831f41b865e413ef82df630001849. 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/FRZ148910060 — a six-check JSON result.
Chant from Benevento Cathedral "The Adoration of the Cross": Antienne "Otin to stauron" - "O quando in cruce"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0524b733d4c758acd66ad4db6c53934b7744e8730792699bf32972509149733. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/FRZ149321010 — a six-check JSON result.
Chant from Benevento Cathedral "The Adoration of the Cross": Répons "Amicus meus osculi me tradit" - Verset "Retulit triginta argenteis"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08653f1a8fbeaa885ded3e7a811ef6eec7ef0aefae62e9e1a2582fd834f5a8d2. 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/FRZ149321060 — a six-check JSON result.
Chant of the Church of Rome Byzantine Influences: Offertorium, Terra tremuit V. Notus in Iudea - V. Et factus est in pace - V. Ibi confregit
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65d53ec591cc777e918d7e6b2a34f0ac54d9c83f475bec38783c08407fa13d22. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/FRZ148513050 — a six-check JSON result.
Old Roman Chant, Vespers of Easter Day: Antiphona Alleluia. Psalmus 110 Confitebor. Antiphona Alleluia
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x636d8d64f8b827d4f07d8f101dbe1bbe46873eeb4b4d7918655741cff3d316c5. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/FRZ149752030 — a six-check JSON result.
Old Roman Chant, Vespers of Easter Day: Oratio Concede questimus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0c58ae12e1b1c3683b3549284ec2b56604967b5bf7b6ab45e7cb8b493f8386e. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/FRZ149752080 — a six-check JSON result.
Old Roman Chant, Vespers of Easter Day: R. In die resurrectionis. V. Congregabo gentes
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfab86ddeab29d5091f0135b0273e9039bbba1dc817e9c9d032994fa3ff355630. Chain 2 (Bitcoin): anchored in block 959103 (2026-07-22T05:56:21Z), 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/FRZ149752090 — a six-check JSON result.
Cistercian Chant Responsories of Matins for the Feast of St Bernard: Prima virtus viri sancti
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27c1311541df37b528bd9ab51aff95c575d6a704985c54d43b7531a7fb1adacb. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ149107060 — a six-check JSON result.
Cistercian Chant Responsories of Matins for the Feast of St Bernard: Testamentum eternum
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabb5f0cf0e581827bdb336a73f7690523ec5a3d1646428712225c5ee82e8e480. 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/FRZ149107110 — a six-check JSON result.
Cistercian Chant Responsories of Matins for the Feast of St Bernard: Oliva fructifera
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39e450754000c093fc5d16f7d43b4e1bea209c972f4c7920804796634c30a4ba. 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/FRZ149107120 — a six-check JSON result.
Cistercian Chant Responsories of Matins for the Feast of St Bernard: Dedit Dominus confessionem sancto suo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48a9d73b178d194148dc033a69df139a707f4ad145318d42d08e8c7f3c5b4ee8. 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/FRZ149107130 — a six-check JSON result.