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 0x49f5dc9a8b7dbcf637610146996e66d50e0e6271b2c9496b6281bfd17d8051b9. Chain 2 (Bitcoin): anchored in block 953678 (2026-06-14T19:23:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/63a0b736-bd2b-45ec-9f3b-dd1445273255.json and https://artists.proofprofile.net/proofs/artist/63a0b736-bd2b-45ec-9f3b-dd1445273255.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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 0x004acb7bac5579d1210067bf78a83577ce34b5ac7d6415ec303faf92b408723c. 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/FR50X2178701.
Philippe Hersant: Musique à un, deux ou trois
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2 Mélodies hébraïque, M.A 22: I. Kaddisch. Lent (Arr. for Cello and Piano by Ensemble Contraste)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd327b7b0843a1d764b1d1d05a5cd781a709ccb38714de82ea261f812409e61b9. 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/FR50X2076302.
Schwanengesang, D. 957: IV. Ständchen "Leise flehen meine Lieder"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7013a28c1987d6918b69f5c06f5d22d6c13f2e7aaa07cee8184a8ef0e5e84023. 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/FR50X1941801.
Winterreise, D. 911 Op. 89: I. Gute Nacht
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88137da4838cad258beec8d8877c8b4ab0c1bc5afa594a46355cfd415fd4ce07. 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/FR50X1941802.
Winterreise, D. 911 Op. 89: IX. Irrlicht
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74677f18b5b34dcf84fc8a0cca08275529d5232f0c37067196a554fa7d86b29b. 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/FR50X1941803.
Improvisation on Arpeggione Sonata, D. 821
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x401d4b79744457606da5eaa4e433ca7e5f6433b305a4dff9c08c7b50c92d5dba. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR50X1941805.
Die Schöne Müllerin, D. 795 Op. 25: XVIII. Trockne Blumen
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcceab0e738a4e5488574ba9cbf27d1fb1a50b9e2dae38d64e65c6d6e5b552bb7. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/FR50X1941806.
Impromptu in G-Flat Major, D. 899 Op. 90 No. 3
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b4ffeebbe417bd0f95433225910318191b456177b68e9a16c9e3413c55e0185. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR50X1941807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x870bb530d4e9472aeec7ba3227c36cdca9ecf10426ebb614f23aaa972dd85a50. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR50X1941808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5f2a18aefed4ce264b18d1a74a31fbcd70e4355b0d1bd91b77711576a0a3ec5. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/FR50X1941809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea6cc9d2741167c858f7b0ae80da6166eea6fe728fbd9193338d7b68410e834a. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR50X1941810.
Improvisation on Symphony No.8 in B Minor, D. 759 "Unfinished"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bd74928585ed76a195cfc9fb4c4c39739e6fbebfa0b1b01dd6a9b44bb66ed35. 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/FR50X1941811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dbba1a40c03f221edac18a62b254a5e639eb15fdbb4e5ea0f83e23d782d91cc. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/FR50X1941812.
Winterreise, D. 911 Op. 89: VI. Wasserflut
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5d53950f44b7699c02931e3e97448a3ef78c7aa0b989c9401ddbb5660903f28. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/FR50X1941813.
Moment Musical in F Minor, D. 780 Op. 94 No. 3
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf065590b56b3c54e91b7f24a086644aac7268371167cf6f7d9365c2ce76ef1e. 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/FR50X1941814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76df2ed7703590e2c73299fea8dbc6558bd7d030bcf2d37e4524332d7a134aac. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR50X1941815.
Concerto pour Harpe et Orchestre à Cordes
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2660607fb72a77227b0e183f19f255794b747b3b5dce0112b22bc9f8a3c20e1a. 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/FROV61310803.
Choral pour orgue « Ich ruf zu dir, Herr Jesu Christ » BWV 639
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d047fcc2504efc041d83a700f9d3fd0ca4e65a0ba3b14993d2cd2a1d2cebe1d. 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/FR3Z51100167.
L’Offrande musicale: Ricercare à 6 BWV 1079
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a8a14ffd71a3ce03b0c169b5407b627dde15d41a513f7129fbad870e81c7180. 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/FR3Z51100171.
La Passion selon Saint mathieu: Aria « Erbarme dich » BWV 244
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdcf2bd5148788700524d8ff586aded525b04e691609c1b9319fb2cdc18f1021. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR3Z51100173.
Passacaille et fugue en Ut Mineur pour orgue BWV 582
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe35078c1ff3a92ddd1d6d71ff0d554c02dd0473c1656525e7199121c7b53fa42. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR3Z51100174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7837ecdca52488d86e95665c7988dd83fe165a21371b0ac3fed9a33a2b450f80. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/FR3Z51100175.
Schwanengesang, D. 957: IV. Ständchen 'Leise flehen meine Lieder'
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7013a28c1987d6918b69f5c06f5d22d6c13f2e7aaa07cee8184a8ef0e5e84023. 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/FR50X1941801.
Chill with Brahms (Enjoy the coolest melodies of Johannes Brahms)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b40c695c1f531ec6f57a42a7c784df41fce94b5b554157cc85e94023547b5f9. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/FR00W1900190.
6 Duos, Op. 63: No. 2, Abschiedslied der Zugvögel
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2 Duos, Op. 10: No. 1, Puisqu'ici bas toute âme
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Concerto pour clarinette, alto et orchestre, Op. 88: I. Andante con moto
Orchestra Philharmonique de Liège Wallonie Bruxelles
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Concerto pour clarinette, alto et orchestre, Op. 88: II. Allegro moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa96420f99a829cd9febf79b67013bb2070927d3ca20837f3d24d5d5ebf0cd6e2. 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/BEE640971102.
Romance pour alto et orchestre, Op. 85: Andante con moto
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Huit pièces pour clarinette, alto et piano, Op. 83
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Arnaud Thorette . Brahms . Sonates et Trios
Auf dem Strom (Transcr. for voice, viola and piano by Johan Farjot)
Auf dem Strom, D943 - Transcr. for voice, viola and piano by Johan Farjot
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x004acb7bac5579d1210067bf78a83577ce34b5ac7d6415ec303faf92b408723c. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/FR50X2178701.