Artur Nunes (17 December 1950 – 27 May 1977) was an Angolan musician, composer, and activist. In his time, Nunes was one of the most influential voices and composers in the pre-independence days of re
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 0xdae67de9ac056d0fb5c001fd62d585458c23a7ee2d7052abf003c950b7bcf92d. Chain 2 (Bitcoin): anchored in block 953678 (2026-06-14T19:23:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/621fb8d0-8e69-4fb5-b968-9dca4a45a82f.json and https://artists.proofprofile.net/proofs/artist/621fb8d0-8e69-4fb5-b968-9dca4a45a82f.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 0x7eab382eb336398bd86101e96b35a303989e5da76da2b9fa0db9b6d78bc894c9. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/ESA011645473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb85be50790c4deaace09c9d2dd8045542394af32a031192dc4b3ec496daa8119. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/ESA011645477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75600034510de1c84e89425db822255a8f4f013499bb63ab18c033ccaf7a9241. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/ESA011645479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2849fe2ff1630b4c37ce9db8098219fc116821c07454a33b1ec2c3bb96e98e78. 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/QM6P41585583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x045d6a8df8b586da570bf4e9019c44a7180d600f3801e970ddfb20c4595fc427. 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/QM6P41585584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5afe1a1483f54543f1d451d2e5a7b3ced4e2d7364c8d6fe5415acb784cfbc854. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QM6P41585585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b7c20a2b03da7bce2965504dd8727b55cb366ff3e9c43cec3e93a683df35040. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/QM6P41585586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f07ee21b016e0d47bcd14574514f83fe792e51dfb311797f610b686c98d5d08. 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/QM6P41585587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde608287a2827b2f1d06b97f3140d507b1554f78bee8d123a79dc48499aa8b48. 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/QM6P41585588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a032be26e019a3598514c857ebf68864147658c2f1f359c7644f8c620f56573. 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/QM6P41585589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf810e22db3e6256dd7c80a273fb2c6bc86b272371cf72814fc5da28daaf540d6. 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/QM6P41585590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3f79c5072d25c24184164780695753c4ae236b9b6b124c5c4c4e585f8a2e649. 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/QM6P41585591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde3f92dc19769685f18602f05c220f9fdbb5ab93c9682c6b3fb4d8c1047c8ea9. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QM6P41585592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24250bbe7c022908a17eb497b5cbaaad6fba0996ed77f1743dfba3713fbaed59. 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/QM6P41585593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad21fe91012abffaac4fe45132039f987ca923fd296e08e58423182b4fdb96d4. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QM6P41585594.
Soul of Angola: Anthologie De La Musique Angolaise 1965 - 1975
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdedfda81686f3c488d95b607228ca54176c49564cbfb1ead516b559271cb880b. 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/FRX620152020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29306c98e545b894878b297ff4c1bb252847a96e00d34831faf2958adb6d8cd1. 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/FRX620152030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc075afb625f4649aeb56dcfc16db444b2936736cf70352bb008f822883bb86a8. 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/FRX620152040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec9362d3caac9aa5f5b4292685c8c3066fdf66570ae88452da8b4bb59b3a0493. 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/FRX620152050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66b2c3d39b8230f491c857e18956471aea4e16fce17163bec57433bdc4608646. 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/FRX620152060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x441df118177012fc2ca6cb6864d3333465b7baf9d311d1793fc57159a6611129. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/USV351412838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd928a5802fbf37bdff49ae95c656abe24f20470630c09a1cfa5c918a33847370. 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/USV351412843.