Marlos Nobre (February 18, 1939 – December 2, 2024) was a Brazilian composer. He received commissions from numerous institutions, including the Ministry of Culture in Spain, the Free University of Mus
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 0x0150efb77c27a69f18dd09d8081a69df05fc86ddb94331032f7649254a974c44. Chain 2 (Bitcoin): anchored in block 954533 (2026-06-20T08:57:02Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a3026b05-e716-4c1d-953f-2ad720b27be3.json and https://artists.proofprofile.net/proofs/artist/a3026b05-e716-4c1d-953f-2ad720b27be3.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 0xf623af9410c20f639b3a49589e25d73b1628f1b266f417b195f4a254d688eb7f. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DENB21510516.
International Rostrum of Composers 1955-1999
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Danzas cubanas: I. La tarde esta amorosa
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60e39819d268904e8a90981eab83ff5a85c8ab3b6c8f3656c35b4b617580641d. 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/SEXMD9906103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x385b4936e603b1960ae91a861bc42e5099d7746797109e25a61ccf8a6640f57e. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/SEXMD9906110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e9175ac3b6ac8b57ef221386912448a34fab6de05e475c85386947e7f07bb27. 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/SEXMD9906112.
Suite Antiga, Op. 11: I. Minuetto: Allegro con spirito
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x457924ee41dbaa3329a3d6c9c08939ee201bc6647572c215959a639d4d7f66e8. 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/PLA161219001.
Quatro momentos No. 3: I. Tempo de Marcatu
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dc4c5b54698e9a59d7705887bca08f56d7a0014facd56eca42e87b17687a53d. 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/PLA161219004.
Villa-Lobos, H.: Choros No. 8 / Fantasia / Uirapuru / Nobre, M.: Convergencias (Brazil '88 - A Brazilian Music Extravanganza)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8e6f9b492c178f9da919050eac2ea3d870d7f13c7be7fad9df63e108603bf57. 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/USASX0691705.
Na Solidão em Busca de Companhia - Música Brasileira para Flauta e Violão
Archival Series of Commissioned Works by International Composers
Ciclo Nordestino No. 1 for Piano: No. 1, Samba Matuto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b416c22632f7697daa96f7ab1e37f3350e7cbe1ebbac61e323bb00df1648927. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBELU1213601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x899abe8d45a42d9009ac25e9cf3aa77b1397c632c068d286b0fabb1cbb5a2da1. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/QM4TX1590874.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc59ed40e37f4df038a916f138027c4d8a20f3e295d7de9cf3d2eb82cd556b4e. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QM4TX1590875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe37a1167b7ded63d55709c883c0cc66a5a3c5ad55bfe1fa518dff50c432e2aa8. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QM4TX1590876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef074fcfa906244c63c63be94bf1056ce17dee86bba951c89a01bb527e38af0f. 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/QM4TX1590878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1b51a915748b94c102ed53281ec709b162691902819ff7ec2a9a28e8027328d. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QM4TX1590879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dcd2e9d54f90f09bc3e6e0dcbe733669eb5e76402ad84680d9f43c2fb8a0a7f. 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/QM4TX1590880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa82f35503972361b8da7249ee38d586de794daa685f61b4c85154f039df070c6. 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/QM4TX1590881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93e961b6c90aeca4cb91a8057a196eea10d7dcf810b5d27edefd4df318e5c8b8. 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/QM4TX1590883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcffa6449270337aefbbce813475d64b344c9d817d298df993ca6df1f0568a6c4. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QM4TX1590884.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x941cee2c7f83fe0e3176c834268b4bb6f0d70d6ba48b4dc4379a94ee482aacce. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QM4TX1590886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf06e8020c48d7439d5e5e3b4fd6dc598a862c3638289d68fe74b0ab730e3e8b5. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QM4TX1590887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe539d5d1eada54a70774de35cad4e400230fe34206dfe1c794258130c300e6a9. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/QM4TX1590889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2adda250f4a056083864c412b7887a895082c446ec7c2e5f1ee12ae0c74e1a5d. 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/QM4TX1590890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6ecc479267e133592f4b706a2f86ef615348b54d3e5d8df75a8b166d9190b6a. 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/QM4TX1590892.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcca71000b48ebea2524b7b958d01159902ee887ab22893c430fac28612e64b1c. 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/QM4TX1590896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49b05e11af1f3f09bac05c98893ebb24819c5fa5b55cd27e0e13734fd9d31f28. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRV731701254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x774f7e3e785f217fc98e37e3eba8a5103334acbeb27added9520d3da9e258360. 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/FRV731701258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x157d478a3249ec25d913a362734847421cca855cf2659bb96ee5416a0a925c2a. Chain 2 (Bitcoin): anchored in block 960429 (2026-07-31T16:07:24Z), 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/FRV731701264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1dcdbc79975ec6a91e22017edb608140ae33d3378e0aa2e981c2c086213a600. 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/DEFG21928757.
Brazil: Works by Heitor Villa-Lobos & Marlos Nobre
Bachianas brasileiras No. 5, W. 389: I. Ária (Cantilena), "Tarde, uma nuvem rósea lenta" (Arr. for Cello Ensemble and Soprano by Elias Arizcuren)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68906452c9827af35e35a110a049ee49f4f441941295bc5a717c6eae493c5ed4. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/NLA460710530.
3 Canções de Beiramar, Op. 21bis: II. Iemanjá oto (Arr. for Cello Ensemble and Soprano by Elias Arizcuren)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4002d3ef944904e2c0a1674dc23eb86e17e612bdb7065147ac15114597f1e08. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA460710538.
9no Simposio Mundial de Musica Coral (Cantando el Mundo)
Nelson Mandela Metropolitan University Choir
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3e66671c8f19d7623c1d0165bb816ba07b25dfb2e0fd5b1b67babb522a7b488. 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/ARA901200312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa249eae6f10eaa9de5f3f76021d8a83cd7eff24bb70757146f82e51e2ca5fb91. 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/BRSGL7200005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56c55c4a1d4393b90f2d7b5b301640435d5af26ced67169d3667b82072c280cc. 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/DED810261500.
Mignone - Fernândez - Nobre - Villa-Lobos - Nazareth: Brazilian Classical Music, Vol. 2
Works for Bass Clarinet or Alto Saxphone and Percussion
Mahle, E.: 8 Duos Modales / Nobre, M.: Partita Latina / Foss, L.: Capriccio / Mignone, F.: Modinha / Toussaint, E.: Pour Les Enfants