Mathias Duplessy (born October 28, 1972) is a French composer and multi-instrumentalist. Career Duplessy started playing the guitar at age 6 and began appearing on stage from the age of 18, playing a
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 0x7ad2ac4f721b22d77670ff6b75dff45fb23154016f106b80dd7346182d22f2ed. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/34e79226-0d62-4267-a7d3-ef240d1ab18f.json and https://artists.proofprofile.net/proofs/artist/34e79226-0d62-4267-a7d3-ef240d1ab18f.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 0x40f48c5e708804958181ced3a7132806d112cf5df152ab83f69c67feb3041f4c. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/FRP8I1511170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1b5528abba9f25145011a0fa4b2638c518317286c88c333fec20c95dc29598a. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRP8I1511180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x488d0153202e98717740d698045e10a848c9ce160d5b4d9735839e0f95c462cf. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/FRP8I1511190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cdada78b3f19c791be824e9488e4ef227e5d70db908d5ff488cb547438d0b32. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/FRP8I1511210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ff08f73151dddd85cbf731020d54320a4e94b46293d683effe0f76d71be5dad. 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/FRP8I1511200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x669d85b88d3c6348bc1314b6cc4665a622a9d4b11d4420c2b4d940a8797d82ed. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/FRP8I1511220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9145929dd3d88f36775b2624843a6ae7434d725d1506526d02d8178b6018938d. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/FRP8I1511230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb708dd80b166ecda1b13d894b10b9095709769a6ac947923296859e5929f300. 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/FRP8I1511240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdc8423e2ae6ebece06b968ffbdb20ba8ff40c017cb8178800d8ffedd0de07e0. 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/FRP8I1511250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47ac39d9e1b28b0cef1f5e648cb460f8db1a54fbdeb9e538f1cf2b48ebf290df. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/FRP8I1511260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c44c380ca8542fc01ea0cd436c8c3515c545b22c89e94b1ab88ea6099e13cf0. 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/FRP8I1511270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41044617b457f16429cd2b4f0e06fca43516d82cfb6a8611fb7c37d90e09a26c. 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/FRZ051800296.
Vera Danilina: First Prize 2022 Michele Pittaluga Guitar Competition, Alessandria
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb9ab348dc81d377a1ec97fd6a77e93c6226e2399eee4c3ec58c50ecd2c51e6e. 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/USB8U2301490.
Quatuor de guitare in D Minor: I. Allegro
Jérémy Jouve & Friends (Play Mathias Duplessy Chamber Music)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3386e97792bfbe38bbb2ce118f4987a622a5ab1854ce4cb760f05d16518908cc. Chain 2 (Bitcoin): anchored in block 960199 (2026-07-30T02:30:29Z), 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/FRP8I2100070.
Quatuor de guitare in D Minor: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc43a6afa85f970c965680dc420d7d8d0075c8d85c646b5bf8b8cce78b3b0cd32. 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/FRP8I2100080.
Quatuor de guitare in D Minor: III. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1e849e997e76e88f6b60ba928bb6ba2524fecb2d452001748cb9b9b8154d92b. 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/FRP8I2100090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58a41ba2e771e1a1eaefbbb6786ed6b8b03e89e71cff0c77a11548609bec4209. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRP8I2100100.
Sonate pour guitare et violoncelle en quatre rêves: I. Rêve exalté
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d815b577ba2771a7b2325166c763f4d2b45ae3100e447a5d93f0c9585d3a61c. 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/FRP8I2100110.
Sonate pour guitare et violoncelle en quatre rêves: II. Rêve heureux
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82a8d6ee058a0774aace84516c43fa5a944a6fd2566b0c2c217a2b15c92b8937. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/FRP8I2100120.