Lázaro Ros (May 11, 1925 – February 8, 2005) was an Afro-Cuban singer. His music borrowed much from Africa, as he performed music of the Lucumí culture, of the Yoruba people from modern-day Nigeria,
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 0xa90137d80d996735b8599dbd8818968a4fae02822c4b96080ed56e62b6dc30ff. 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/3df1ee90-53d6-4af8-8407-dee73a6f8096.json and https://artists.proofprofile.net/proofs/artist/3df1ee90-53d6-4af8-8407-dee73a6f8096.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 0x9503cd73432f0de8a601c7a4013c098f1a51ccedcbcb9a2e23a5f2d3a8b95ba4. Chain 2 (Bitcoin): anchored in block 958067 (2026-07-14T21:26:15Z), 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/ES7630600781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbb830ddebe9411705684d3b6553aa1d6c8c669b4df240e48e910c759635a641. Chain 2 (Bitcoin): anchored in block 958395 (2026-07-17T10:10:33Z), 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/ESAAI0216095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e26177457a6a5a234f3abaef33d5616b8c2b74ab7be490f28d386ab5782618d. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/ESAAI0216102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac589953904ee517caf2730da67ea2c24952cf96065e51e50e5940dc985cbd12. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/ESAAI0216105.
Oyá Oyeo. Oyankala Oní. Oroinlé Oroinlé...
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dd4ac399a9494e8678fb23f6d5da1cb09f3da505124ef3655df9a0518fd67fd. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/ESAAI0215353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6abcb3997d1ca2c54cc60772210630547a25f8a53ca86e42a40997301b0fdba. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/ESAAI0215935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23e675460ed1709e20f7899f1fa32366e477aed02df770a49e683911d3703870. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/ESAAI0215942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfa91bbbfdafb3097052be0c5f76f0bd30d1c765487413b17ae9e39d37d35535. 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/ESAAI0215946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4095f0ae633574e13cfea951c797dd9540f868e09657111bfe11b396ac02213. Chain 2 (Bitcoin): anchored in block 959065 (2026-07-21T22:00:50Z), 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/ESAAI0215949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cd7be128fd669895e2c7d697e8df81e62c1c62ad93a966cb1f550f01c349523. 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/ESAAI0215954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5028f5c649fb81b3fb4645ecf54e888beda4d940277953008de9bca755033a7. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/ESAAI0160017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba3abe4c821542def381d53c907534ac895b27eb22b9e89c7aa92ac9d84540c4. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/ESAAI0160161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x651400aa9b8d7c5df1e4a56c1a4add3c3e1caaaf35debc8b80c13719f4e9b743. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/ESAAI0159838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x266373bdc7c4d85bca6b27a63b3e934fcdc5e737d0b4b955f6b72e086572661a. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/ESAAI0159787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bd86ad251d13c9ee9b01fc25014f23f2ca0ba8f373c728c42d80029dbcfe302. Chain 2 (Bitcoin): anchored in block 957741 (2026-07-12T18:30:59Z), 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/ESAAI0160377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x449685262b05ef6fcafa1b5643a7cde4aa2df6ede59e879a237b2a337864ddd6. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/ESAAI0159788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b3c360ba6747bc7c23107b6f807303a65f704dc8418d98c492dc593c5f200b8. 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/ESAAI0159836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d652ebb7f645ec9066b1b42e4e5f39ba9a8aeb1124a8cb1c8b87a5507dfc064. Chain 2 (Bitcoin): anchored in block 957741 (2026-07-12T18:30:59Z), 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/ESAAI0160062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32a2ff88bc07c4576d4c15c663aba28a791d4845760d852ba3fe26e81d246211. Chain 2 (Bitcoin): anchored in block 958392 (2026-07-17T09:46:31Z), 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/ESAAI0130340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5fe8e5e881850936bea2f94d24d23e5f349a197b469d38fd629b6897ea80267. Chain 2 (Bitcoin): anchored in block 957744 (2026-07-12T19:15:44Z), 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/ESAAI0160063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2da7e15e8d12f290d7df9d1ac26c8fec5266d6e6c307e478185741622f042f5f. Chain 2 (Bitcoin): anchored in block 959065 (2026-07-21T22:00:50Z), 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/ESAAI0160756.
Argayú Sola. Ibeyis. Orishaoko. Naná Burucú
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0a9b32ef2caf5bee256472b71ef41cbffd80243029d3eeb2930b71996b3df9a. Chain 2 (Bitcoin): anchored in block 957741 (2026-07-12T18:30:59Z), 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/ESA011403879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f02cd496cb81013e311b3010bf0a4ec9762ddc9f6f4afbbdd9ad498d09bc6c0. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/ES6601400953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e9273b652042cc794f583884c2c155ecb3fd3259b508fbfb305e22806b50ffd. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/ES6601400954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe1730bd87551b8d05251e9cdd8248e2186cb76495797d107cd6db9115d15f33. Chain 2 (Bitcoin): anchored in block 957747 (2026-07-12T19:35:06Z), 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/ES6601400955.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe9419a9692b44486b15e9987ab1763a6edaaf9ed46d61e6c7d5858dfad98e2a. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/ES6601400956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18978b419ebac432573eaca568d36c7218858d3beb98289621707b08b47997b7. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/ES71G1513067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x183bfce13b26fb7cb87671b169e85c4b2374ff17859e2a6110f4241928dc6cb5. Chain 2 (Bitcoin): anchored in block 958212 (2026-07-15T23:25:50Z), 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/ES71G1513068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41f0ba2a2b8b2f82c4dc844da695a516fe59269ccea19dbd7442d6a647fdef5e. 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/ES71G1514807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7f5bf04e1ccac765100f978f86c094c2f2af4c1f08143b4a98e3f1675e97d27. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/ES71G1514829.