thumb|Houbart playing the organ of the Église de la Madeleine, 2011 François-Henri Jacques-Marie Robert Houbart (born 26 December 1952) is a French church and concert organist, improviser, composer an
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 0x88fd2f0c3c7c20937e8fb0f6c54938f93bc7de99acc7ae668023efb5181b5ee7. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6e130b9c-3be5-4a87-8944-2bf64d07452b.json and https://artists.proofprofile.net/proofs/artist/6e130b9c-3be5-4a87-8944-2bf64d07452b.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Hendrik Andriessen, Henk Badings, Léon Orthel and Marius Flothuis
Concerto en sol mineur pour orgue & orchestre
Orchestre Philharmonie des Pays de la Loire
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 0xd7e65dfbe5d001dc1c6ceeab4835b474ed70ae045ac5c252554acd0000156cda. 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/FRZ178802990 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45cfd4f0334950853ad05e7b154e21ec10a4d2928c2eb2c6be5685203e089dab. 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/FR6V80748369 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d55774028a119a4dd0464cfa8773318653c2b6f86af3907de8472de82e540df. 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/FR6V80748370 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x969a59e14825934e297048586d8fd5009c59ae6dc8d26abec6d380a6f229d59f. 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/FR6V80748371 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e4fadcb94bdfafc25d98dcee6e7f703fb993104d45de7ccb54c4ba3d0b831cd. 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/FR6V80748373 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5283d350da6cbecd1d18e2c57e55495bf2a16db5ad7801753196fd19e013d41a. 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/GBAYC9203405 — a six-check JSON result.
Fauré: Requiem, Op. 48: VII. In Paradisum
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x132b14a7d168c1881f1dc1ab5d344137226daac3530847e697e51d3f1a790615. 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/GBAYC9203408 — a six-check JSON result.
Fauré: Pavane, Op. 50 (Version with Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1b5098f2ae9fde6dd516ea38290320eba96b806e25d4fa0bd4acb9ec2cf13e9. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC7400038 — a six-check JSON result.
Fauré: 3 Mélodies, Op. 23: No. 1, Les berceaux
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1d81b00b3dd3f000c6e161e4c2a0d11f113b8e12d97de550a7516de55aeac93. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/GBAYC2002130 — a six-check JSON result.
Fauré: 2 Mélodies, Op. 1: No. 1, Le papillon et la fleur
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ed222211be8bb634795d5deeb4aee5ce51b1a8c904cc9d9995d52ab14a06d4c. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/GBAYC9902533 — a six-check JSON result.
Ambroise Paré et la Musique (Ambroise Paré Music Favorites)
Corrette: Six concertos pour orgue et orchestre
L'orgue de jubé d'Arques-la-Bataille (Bach et ses précurseurs)
Bach: L'orgue Bernard Hurvy de l'Abbaye d'Achel
Suite en ré majeur: Airs de trompette 1 & 2
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb909aa348103e070fb0771e24e0770f5c6a4de6069019274b236b2a3a00b60a9. 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/FRZ178602580 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x162c327ebeed868420d8159f6624a118cc04b2f35c62636bde45469227ad76ed. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/FRZ178602630 — a six-check JSON result.
Grandes pièces héroïques : Cuivres et orgues
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7aae5428a61c79cb41eca7ac3271233ac841087c80462aa669d13db9a6c5e521. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/FRZ178503790 — a six-check JSON result.
Nivers : Motets pour voix seule & petits chœur
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18b63f097ed9d2f2ee8f0570328506b8b8823102544a0df580727c90a5212d93. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/FRZ110200174 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cda0f755f550a8d87ae822f1f815c86ffcb638a0c4f15cb721dedd2f08da6be. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/FRZ110200175 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x121ad0ed827d3f163c076a574dd0e7d14be78267a36d367003a041a6b447fe45. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ110200177 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa817110d1409ea524391b7408dfe81d6bb3220477758382891f458538272e70e. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ110200182 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62a5f2a1900c819fc5f0f853ba6dbf39b146f069f7f2e26cd6e2b63e5c26e685. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ110200184 — a six-check JSON result.
Violon pour les jours de fête (Festive Music for Violin)
Orchestre Symphonique De Radio-Télé-Luxembourg
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec8513891cfc19685238c9e4a2481cec1e1e887d7a8c46b0fe4767ee38ace5dd. 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/FR6V80867266 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb218214ba52e0557978134e13174e2debdbe43e5026ee8486c0f6a7fe7f014f3. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/FR6V80867267 — a six-check JSON result.
Adagio en Sol mineur pour cordes et orgue
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9f45618cd8e8acc3f346a3600caa875217322a3d9d024f51b4a7c4eccdcd965. 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/FR6V80867270 — a six-check JSON result.
Saint-Saëns: Requiem, Op. 54 in C Minor & Organ Works
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ba6e55b38a4463187b3b2c7c5e8ee2a77cc40e51c7ebcc6eaed16b153c5db0d. 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/FRY839105000 — a six-check JSON result.
Mademoiselle: Première audience – Unknown Music of Nadia Boulanger