Emmanuel Séjourné (born 16 July 1961) is a French composer and percussionist, and head of percussion at the Conservatoire de Strasbourg. His music is influenced by Western classical music and by popul
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 0xc30b0c3565251156c243d753295320dad7d60384454dd2ddcb734727557ca1e3. Chain 2 (Bitcoin): anchored in block 953657 (2026-06-14T16:43:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/50e07d38-917f-457f-8d69-72f91f8bea0d.json and https://artists.proofprofile.net/proofs/artist/50e07d38-917f-457f-8d69-72f91f8bea0d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Lauda Concertata: Works by Séjourné & Ifukube
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 0xa9437eb0887b296efa8b24559c3928862b5c345bfd914765d00d6def3317a3b6. Chain 2 (Bitcoin): anchored in block 956576 (2026-07-04T02:06:47Z), 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/DET901644101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c969bff6b2c3765d50a63f5fb71ad4af850fb4e88ecfd8998d52f2aa8083ac9. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/DET901644102.
Marimba Concerto: III. Rythmique, Énergique
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae3dedbdbfd82a3d938fc4336ff87db7e3e34decffd9175a3c4a2c53316528d1. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/DET901644103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x176d80ed8c56d96fe0f91e392be05b7c3001c58d0722edf82de3e2d10be759d9. 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/CAJ720960806.
Concerto for Marimba and Strings: I. Tempo souple
Sammut, Ignatowicz-Glinska, Séjourné & Rosauro: Marimba Present
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85fe6c081f2afe474e9f21b09d367a9da74dd296086cf5ea33b74904e7f0ced1. 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/DEE281659206.
Concerto for Marimba and Strings: II. Rythmique, energique
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb84170018bfdd5224c94c0d6852f217eb26d082f7f1ebd04e743861b3cbab2de. 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/DEE281659207.
Marimba Concerto (2015 Version): I. Avec force
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02f5707afb6cfbd320d6e1d82d4d6e0e0c6e7c464cba0ff128c8c4b9cf101904. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/DEU921809004.