Joseph Kosma (22 October 19057 August 1969) was a Hungarian composer who immigrated to France. His most famous composition is the standard Autumn Leaves. Biography Kosma was born József Kozma in Bud
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 0xb2133da99d5cad548729b2d92f4ed073103c42b7f51f161ecfa2b14c2e898ebf. 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/29e38358-518e-451f-b87a-1f606ce31307.json and https://artists.proofprofile.net/proofs/artist/29e38358-518e-451f-b87a-1f606ce31307.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Les enfants du paradis (Marcel Carné, Jacques Prévert et la musique)
Les enfants du paradis (Générique 1ère partie) - From 'Les enfants du paradis'
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 0x53905beb2b92b2b52a1a679649d1203becdaa8728b84f52ef71d8af6d9a409b5. Chain 2 (Bitcoin): anchored in block 960285 (2026-07-30T17:26:40Z), 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/FRZ811206022.
La pantomime - From 'Les enfants du paradis'
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc957520b6be61d09e769f6c57191093246572524fcbcd39d2aa6d1a59b2a6442. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/FRZ811209048.
Cinema: The Silver Screen Classics Collection
Kosma: Suite symphonique d'après "Les portes de la nuit": III. Introduction & Valse "Les feuilles mortes"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8804c86bca6b346a5e459cc2b1fe310c4d7a08134c4198ce57c1d9649f74f4fa. 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/FRZ110601734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa877a2d4a0a4a97313959beea06130a13aa164d8b12893ca6a4994acf583526d. 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/DEN962030322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72e4df26789d9c1101289e5735ace27a2c03abc7dccbfeeedb50f107a55b2bbc. 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/GBAYC1901102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe79cc8b1f277c84f6b172a62b79e85bea0152656e7270376cd44714cf691a2c2. 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/GBBBA0941680.
Kosma: Suite symphonique d'après "Les portes de la nuit": IV. Chanson "Les enfants qui s'aiment"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08411fd449c06d7babcdf7b9f552725cb141cee2b64e4e946f39f92c9ba071d5. 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/FRZ110601735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ee581060b8283b5100efac4de0bf734a50cf8c39a90456a34152a7c09b1a05b. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/GBARK0300029.
Deux escargots s'en vont à l'enterrement
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30a72608302e6965f80a8a886626eb565afe356845fbeee2f80437b472ab4081. 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/FRZ081100131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec8e387873a24c0be7207a4b026eef78568edfc4ee6699a914c0e97af074f5db. 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/USSM18200261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a477b82e877b4d83481f3928e1b3bc4433cc1c4dbdbaf4cf4add4999ae1a826. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/FRZ081100128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa8c382fa7161e51612ccdae31bc4d2c8284f700db694afb91e7b6fbe4a4ff84. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/USSM12005298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6b8297cb44062d0bd390020a0b8eab36c68b9e921ec45705d739df97ce957b0. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ081100129.
Autumn Leaves (Les Feuilles Mortes) - 2004 Digital Remaster
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ba1d47e631bd2a19ddf69d98006c1cc4e8ab5b738a8945a21d1bf55dc3b5f54. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/GBAYE0401684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3663aab945445ba1c8a913347b76379b87391e4fe88959fbdcbd1efae1c63840. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/USX761695304.