thumb| Laurent Martin (born 12 September 1945) is a French classical pianist. Biography After piano studies with Geneviève Zaigue in Troyes, Joseph Benvenuti at the Conservatoire de Paris, Germain
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 0xc2109dcbd502cd0eef215f3c2ef502ac6b0004c940f7c3708ce08e7466236817. Chain 2 (Bitcoin): anchored in block 953625 (2026-06-14T11:37:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2959189c-e8eb-4ee3-8c77-8cd85f5340f7.json and https://artists.proofprofile.net/proofs/artist/2959189c-e8eb-4ee3-8c77-8cd85f5340f7.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Déodat de Séverac: La vasque aux colombes
Viardot: Intégrale des mélodies russes, Vol. 1 (Pouchkine & Tourgueniev)
De Montgeroult, Chaminade, De Polignac, Selva, Bonis: Compositrices d'exception
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 0x36471460299968ded4e682d442141f634977c917a3800b1f8a9bf85352c7f5b9. 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/FRX401900039 — a six-check JSON result.
Strohl: Titus et Bérénice - Onslow: Sonate Op. 16 No. 2
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2275c3a2f90f707378fe5730368c4ddf2fe0df91b3d34e4883633aa6fdbdc958. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/FRX401700015 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fa3a166d2f2d82e5c071bada1321c67b43fc61e15d108441741599c6e83b0dc. 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/FRX401600071 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xceb58e8eaab5120b872189c06a2e0495f97f2b41a4b8f94dc8950f0fc8f3ddf8. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/FRX401600076 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90b98e4de0a5a648dab740294543b7f45936e6d811d1bb3dfb175d4609cad247. 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/FRX401500371 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x705382ec803d2712842ebf2893c6c8fa889ae4e4ee93e6637def3990980e240c. 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/FRX401500373 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2478aba28f2f8af74ea99e9de610271c75e4db4e871a829bf3366067989e94fd. 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/FRX401500380 — a six-check JSON result.
Suite en forme de valses: II. Interlude et valse lente, Op. 36
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ff269bb0f367ca147f71fc52de49a82925fda179ecf3f440b221a59c6edc16a. 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/FRX401500165 — a six-check JSON result.
Suite en forme de valses: III. Danse sacrée, Op. 37
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3aee07ac53dd04f624416dd4273586fa3076ad542d3578b587a690a4515d60c5. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/FRX401500166 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab1c1f361eb7cf12a0140e8818ad3fafc10f0d4c9749f04b48705da0abb13315. 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/FRX401500170 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82e7328d52f9c7ebfdc01722ab71455447082ab0ae61180b5038736da8397d06. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRX401500181 — a six-check JSON result.
Selva: Chants de lumière (Mélodies et musique de chambre)
de La Tombelle: Trio Op. 35 & Quatuor Op. 36
Viardot: Mélodies russes (Les compositrices, Vol. 4)
Bonis: "Le songe de Cléopâtre" (L'œuvre pour piano à quatre mains / Les compositrices, Vol. 3)
Suite en forme de valses: I. Ballabile, Op. 35 (Mouvement modéré de valse)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc70a60cbc44c438d194f1afceb500fc1a01e685f430b59b8ae9663be35ed0656. 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/FRX401100107 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6b3f3338f894fab8fdb6edb095e268190bfa2a6019272dca0753ed63caea36e. 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/FRX401100118 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x892f7bbffb5152380725121d55440374efe9a4c9b1338240548e30930905ad85. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRX401100120 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32ef589c64ea157a26381d5b19dc7b92cdedf3e1842eff1e9dcc1a888066fb8b. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRX401100126 — a six-check JSON result.
Concerto after Marcello, in D Minor, BWV 974: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x097670d14555dc8fb421b01c7f53c18880ae5b862c8921355f47db0a5499f1d5. 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/FRX401100091 — a six-check JSON result.
Chabrier : Prince du burlesque, mélodiste raffiné (Mélodies, œuvres pour piano, œuvres pour piano à 4 mains)
Dubois: Remember (Musique de chambre pour violon & piano)
Boëly: L'œuvre pour piano à quatre mains
de Castillon de Saint Victor: Pensées fugitives (Œuvres pour piano)
Musique francaise pour clarinette et piano
Haydn: Sonates pour piano HobXVI: 6, 23 & 49
Onslow: "Aussitot que la lumière" (Œuvres pour piano)
American Music: Bernstein, Cowell, Felciano, Copland, Cage, Carter, Glass
Schubert: Ultima Verba (Klavierstücke & Impromptus)
Alkan: Portrait "Le temps qui n'est plus"
Onslow: L'Œuvre pour piano à quatre mains
Sonate pour violon et piano in A Minor, Op. 105: I. Mit leidenschaftlichem Ausdruck
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x204ae381f11810924a1508539618b7b9540620680231fdc828937702ec15ca0d. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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/FRY229703193 — a six-check JSON result.
Scriabine: 1888-1914. Itinéraire planistique
Schumann: "1835" (Carnaval, Op. 9 - Sonate No. 1, Op. 11)
Liszt: Harmonies du soir (Ultimes pièces pour piano)