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 0xd20697771c89b3bfd384e3c59c7cd31c0ad7c14a9cb9628713b9862e15c90b41. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8537d181-a9ae-4102-87bc-93c336003eb5.json and https://artists.proofprofile.net/proofs/artist/8537d181-a9ae-4102-87bc-93c336003eb5.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
L'invitation au voyage (Arr. Rouger for Choir and Piano)
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 0x311a6a75f1c163696f2418edf46c7a3e218708914c4eee09c21aef8daf0ac6fb. 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/DEB112002901 — a six-check JSON result.
Soirée en mer (Arr. Rouger for Choir and Piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaea92deba6c2bd32d3561ba57d5238d4d13e7f6798a90da4d802d1c10f7bf502. 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/DEB112002902 — a six-check JSON result.
Adieux de l'hôtesse arabe (Arr. Rouger for Choir and Piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09e3ff82f4a3d6f45500336cc63ae2fdcf77f11a3d3c199cd74d5ff04b397d72. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB112002903 — a six-check JSON result.
3 Songs, Op. 6: No. 2, Tristesse (Arr. Rouger for Choir and Piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13352d401cd11e8dac738d64a4135fc954629643187c2d434c63984769b335e2. 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/DEB112002905 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd84cb3adfac0499e684cb777ffbfc5c6d59bb14ea4030da39955de5cda2213a9. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB112002915 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa235b298538b76eaf860203e7562518a8386ab8f55939c8d0926a0aa4c79554. 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/DEB112002922 — a six-check JSON result.
Wo die Zitronen blühn: Lieder bearbeitet für Chor und Klavier
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4377eb48faad63a7892ad3ee4b8f6ac9a43714dc30a6a8a51659564c0524efa6. 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/DEB112002916 — a six-check JSON result.
L'absent (Arr. Rouger for Choir & Piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9c1d444c90854c0bb773270016f3f636de5d7cd1cbca5a6e4e830fdfbc5b121. Chain 2 (Bitcoin): anchored in block 960383 (2026-07-31T09:50:37Z), 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/DEB111804901 — a six-check JSON result.
Trois melodies, Op. 23: No. 1, Les berceaux (Arr. Rouger for Choir & Piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x078f3cbf8691c425a4cb2cb9908dcdb95940f8eb7818520a65ff15ad7728acaa. Chain 2 (Bitcoin): anchored in block 960167 (2026-07-29T23:42:34Z), 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/DEB111804902 — a six-check JSON result.
La vie antèrieure (Arr. Rouger for Choir & Piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39f7c973494e70987a7ec1b9a53c5e86b273c97e1b69eb63ad82f0a4dfc62e6b. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/DEB111804903 — a six-check JSON result.
Chanson triste (Arr. Rouger for Choir & Piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6c43d39d3ba1ce97fe8bc9ad8777dd2672db30adbc41649477322a17169af5b. 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/DEB111804904 — a six-check JSON result.
2 Songs, Op. 1: No. 1, Le papillon et la fleur (Arr. Rouger for Choir & Piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8e88ce8049b905150b12efccd1d442cce71954082c7760a0f870b2714818837. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/DEB111804906 — a six-check JSON result.
2 Songs, Op. 1: No. 2, Mai (Arr. Rouger for Choir & Piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f101905e771b9e232b373fdc128304ca747b494955a97995b4b648cefe9d918. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB111804907 — a six-check JSON result.
2 Songs, Op. 4: No. 2, Lydia (Arr. Rouger for Choir & Piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62bb538d2fce7f5447b0d9ac63f9dbc1f25afc8375b4e461143dc3658d648074. 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/DEB111804908 — a six-check JSON result.
3 Songs, Op. 7: No. 1, Après un rêve (Arr. Rouger for Choir & Piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09c53edfbb9fce982df7117a8705b8a5680cf25186786e0af4374a56efbb9664. 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/DEB111804909 — a six-check JSON result.
2 Songs, Op. 2: No. 1, Dans les ruines d'une abbaye (Arr. Rouger for Choir & Piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaae2d0fa5a352f577846178748ae931f40d4d770280ee8be9386298458bc8c6. 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/DEB111804910 — a six-check JSON result.
3 Songs, Op. 8: No. 1, Au bord de l'eau (Arr. Rouger for Choir & Piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda4e6f593c6450a5d27b7c95079feba7b765d0a0b475b2c42ed79191087ddb73. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB111804912 — a six-check JSON result.
3 Mélodies, Op. 18: No. 1, Nell (Arr. Rouger for Choir & Piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9263d16d79cd19750a021935f73ef9af769e782925f4d2501c756646838c985f. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB111804913 — a six-check JSON result.
3 Lieder, Op. 12: No. 3, Warum willst Du and're fragen? (Arr. Rouger for Choir & Piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf88cf28c5c9bc3a295943026eaee90ce6c9e73a61ab866dcac1dea9923ae7035. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/DEB111804916 — a six-check JSON result.
Neue Liebe, neues Leben (Arr. Rouger for Choir & Piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x964cfcb6722beb1667ed257b37160447f85a2cb392ca953105f081ad8aeba266. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/DEB111804919 — a six-check JSON result.
Aimons-nous (Arr. Rouger for Choir & Piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb44969f1ba091b8ef55045e5ba9b783825b7dbea223b5f8dd1f78555af35e971. 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/DEB111804920 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e32bf6560bc27fc111d061023447cc042aee2bc0989954dab7db68bf48e9460. 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/DEB111804921 — a six-check JSON result.
Beau soir (Arr. Rouger for Choir & Piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cc64fe0590ebc6c14af5d4f9e12871d917c23e092ee07cb42cf4fd3dbe374eb. 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/DEB111804922 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89c6634a725acc7ae2086cbb455fd9563c2dac7253e02b5e2795e7502b89cec8. 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/DEB111804923 — a six-check JSON result.
RENCONTRE – BEGEGNUNG. Liedbearbeitungen von Fauré, Gounod, Saint-Saëns & Hensel
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd03634287a15070933f0bafb89df4377f51cb8b7835f9b4f75d44a6e621ed71. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/DEB112405209 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf888d45b90dbb4027a5e519418fb4163f3be4a4cddce38a31be11254befed2ee. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB112405223 — a six-check JSON result.
Die Blümelein, sie schlafen (Arr. S. Claas)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf58480ca8048964628eae98cd367d3f5cb22a1a15c06827240ed49b96aa8c896. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/DEB110701922 — a six-check JSON result.
Guten Abend, gut Nacht (Arr. G. Mezzalira)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8751108daa47e59498272cd1584197d5bfc66d22a0a9b3d17e0e1dbfd612ff69. 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/DEB111601401 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d7a2b5f7e658e9c39989069e65186330a88af15d5e5466d95c700fc26c17332. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB111711806 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10d1749fa43b6f172069658fe0736e207f0c85241f461266b2e7fecb38078816. 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/DEB111711809 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40bf33fc48b07186d282e29821bcfebfa3ece8b833dcf5b5668c08d9cdeb6e1e. 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/DEB111711814 — a six-check JSON result.