Florian Sempey (born 29 January 1988) is a French operatic baritone. Career Florian Sempey studied piano and voice at the conservatoire in Libourne and then singing at the Bordeaux Conservatory. He m
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 0x0e9d5cd6d232684fec8ae016816aa776ff006b43a4833ffe557c34ea6699e00e. Chain 2 (Bitcoin): anchored in block 953626 (2026-06-14T11:41:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2a3bbdac-cc63-489d-a40a-49506d7df206.json and https://artists.proofprofile.net/proofs/artist/2a3bbdac-cc63-489d-a40a-49506d7df206.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Il barbiere di Siviglia: Aria. Largo al factotum (Figaro)
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 0xb8aa9d02ed3622475f05e0fa13ecbd94d080b3a46f8cbdacb652adcab7cf89d7. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR50X2179101.
Il barbiere di Siviglia: Duet. Ma dite, signor Figaro-Dunque io son (Rosina, Figaro)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bee27f67f2f5c0623d6d31f2cc0ca8ae49f655fa9eba443f131d0515894b96e. 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/FR50X2179102.
La scala di seta: Aria. Amore dolcemente (Germano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x949c99fdad58b5c288d5fd22cf8b4dfe37cea8e6f17fcaa7b46d98df4f631598. 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/FR50X2179103.
La Cenerentola: Duet. Un segreto d'importanza (Dandini, Don Magnifico)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbe4a9455788fb4dc32b08d5de94c559d9f366e38504288135a5a4d1a843fb94. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/FR50X2179104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb267bfe8db665215718a08210fb45aa2314e57b4f77ae2fc0173b113815a4955. 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/FR50X2179105.
Richard Cœur-de-Lion, Act I: Ô Richard, Ô mon roi
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9da1f2d25848d00874794056b8fc4dbd60a42035d04fc89da41a8fbbf6c9b257. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/FR50X2410401.
Hamlet, Act II: Ô vin, dissipe la tristesse
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96a3eb10d7499497ee88ec51439061f5a279162d6638652abc40122de6d3c8ff. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/FR50X2410408.
Hamlet, Act 5: La fatigue alourdit mes pas - Comme une pâle fleur
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x154c9f391de052a006109f19f3b6aa709dfe3621af91187c5eb3541db0e909e5. 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/FR50X2410415.
Les Pêcheurs de perles, WD 13, Act I: Amis, interrompez vos danses et vos jeux!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef61b81f8046409e611ad75c8d259312957ca8da4d9a85569542ddd39500244b. 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/NLE421702603.
Les Pêcheurs de perles, WD 13, Act I: Demeure parmi nous, Nadir!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71a0a855d0f323fcfac276efbcdeec0dc36af3534ccd6a3a523e32bb9fa4bb91. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/NLE421702604.
Les Pêcheurs de perles, WD 13, Act I: C'est toi qu'enfin je revois!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68285610aadf045e98eda2caf3f84e474d39882c61feb87d3e6e6368a7ca6b0b. 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/NLE421702605.
Les Pêcheurs de perles, WD 13, Act I: Au fond du temple saint
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf271777a4c091bdd69bb5c5ed4e5d45bbf45aa34a7bd82a1794be5943b9f9a07. 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/NLE421702606.
Les Pêcheurs de perles, WD 13, Act I: Que vois-je?
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe84453e901156effe11d953de3815e8653aafd74825e43f47d372595245288ed. 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/NLE421702607.
Les Pêcheurs de perles, WD 13, Act I: Seule au milieu de nous
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d1dca8704382a4206ee2969eafeb86229b548a8381e524dfe03cd2c3ad081e7. 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/NLE421702609.
Les Pêcheurs de perles, WD 13, Act II: Ah ! Revenez à la raison
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8aa58325f293146b1beaf923b6731fb9f6535543628286161be47e193a619871. 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/NLE421702618.
Les Pêcheurs de perles, WD 13, Act III: L'orage s'est calmé
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c48025903fed8e672011f43df56ad79784f03b922292ef8b6edbbbc41558151. 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/NLE421702619.
Les Pêcheurs de perles, WD 13, Act III: Qu'ai-je vu?
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdff1467eef0bbbc09932bfd07b9779a02a0522261fd62e69f408135c06adc1b2. 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/NLE421702620.
Les Pêcheurs de perles, WD 13, Act III: Je frémis, je chancelle
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30b5678406a6cddc9d55dceec7e12e1402610face8eeebab615e1de64270314f. Chain 2 (Bitcoin): anchored in block 960330 (2026-07-31T00:58:21Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLE421702621.
Les Pêcheurs de perles, WD 13, Act III: Entends au loin ce bruit de fête!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8911b9809b32902ea60c003344d4053823a84ba6a1fb7760f8a0fe19281e3672. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/NLE421702622.
Les Pêcheurs de perles, WD 13, Act III: Le jour enfin perce la nue!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a4c8c38f679a37f140f163545431adac69a4f69a0007293977ed4738bdf0996. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/NLE421702626.
Don Carlos: Le voilà! ... Toi, mon Rodrigue
Orchestra del Teatro Comunale di Bologna
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4139d9e8948fd1da18d5594a2d4a800db0772d4bde338513c94d994ff1c09873. 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/DEN962102050.
Don Carlos: Dieu, tu semas dans nos âmes
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x379dfd0f55b4457ce48984696126dcc1bda9f57abc5c27159987aa599ef151f8. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/DEN962102060.