thumb| Nicolas Courjal (born 18 January 1973) is a French operatic bass. Life Born in Rennes, Courjal studied the violin at the . In 1995, he entered Jane Berbié's singing class. He then perform
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77cdbdaa557bbc0043b3cf01901e8e1ba6944ba3bc73bcbc2b92b0654e8660c0. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b8245959-fcb3-4736-bc5b-8734c44cf005.json and https://artists.proofprofile.net/proofs/artist/b8245959-fcb3-4736-bc5b-8734c44cf005.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Hippolyte et Aricie, RCT 43, Act II, Scene 4: Dieux ! Que d'infortunés gémissent en ces lieux ! (Thésée)
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b13cc5b9440943cc2fbd814e570929cb3b85deefc0979cfed27c8299a155265. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR7JM1675070.
Hippolyte et Aricie, RCT 43, Act II, Scene 5: Vous, qui de l'avenir percez la nuit profonde (Pluton) - Quelle soudaine horreur (Trois Parques)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24a7d78e1b78c7a5c972dddd02bd18eb6b04acff122940508368cb174b0cdc4b. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR7JM1675160.
Robert le Diable, Act I: Sicilienne. Ô fortune ! à ton caprice
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54c4e1d0e0257fe0f97bb0b3249bb87fb2ee6b5d7e15efbcb18151d47b400709. 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/ITJXZ2100508.
Robert le Diable, Act I: Introduction. Versez à tasse pleine
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75ac863577319f48d15b1241ee54042ab13967437a5ffc3a38c618ebe52bb015. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITJXZ2100502.
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
Robert le Diable, Act I: Scène du Jeu. Quinze !
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2eab6038c6607a560d67139077355dff6d1278b4b0f26958ba9708b072cea4fc. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITJXZ2100509.
Robert le Diable, Act II: Récit et Finale. Quand tous nos chevaliers
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9088ef5a802da501134e39eec61a9c36943c568c6223eb9370363e2c67e9f238. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITJXZ2100518.
Robert le Diable, Act II: Récit. À toi, Robert de Normandie
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60f94383e2daf0a96c8640aa2fe539900bd79f8dac7fda679095adb132ac8a92. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITJXZ2100515.
Robert le Diable, Act II: Finale. La trompette guerrière
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4eb26accb88f2df9529f6584f00d93d7aae8b70f6f996c7f3c8efeb1d68802ff. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITJXZ2100519.
Robert le Diable, Act III: Entracte, Récit et Duo. Du rendez-vous voici l’heureux instant
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0db264d9049e627ee8313a8d8c6d172ffeeebf0b0e3c7918239fb7ce9c54d929. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITJXZ2100520.
Robert le Diable, Act III: Valse infernale. Encore un de gagné !
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x619fc972de5caaea800e890292f8e54476c307c9802b8b84b5fa4805e8a141b0. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITJXZ2100521.
Robert le Diable, Act III: Scène. Ô ciel ! le bruit redouble
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedd5d73edf278626363c2eca9f5bd67e403e778228bbd8d7755bf19aecdb9098. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITJXZ2100523.
Robert le Diable, Act III: Duo. Mais Alice, qu’as-tu donc ?
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf80ddfafc3c3c13e8b60a78193fef71565b4319ea00d174624843f7503f222a3. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITJXZ2100524.