Israel López Valdés (September 14, 1918 – March 22, 2008), better known as Cachao ( ), was a Cuban double bassist and composer. Cachao is widely known as the co-creator of the mambo and a master of th
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 0x59bb7e52ca096527dcf597fcb645c011b1db30ae8c964e92c4f54dd677a47780. 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/e7892c31-a67a-42d8-a6d3-29efc209ceee.json and https://artists.proofprofile.net/proofs/artist/e7892c31-a67a-42d8-a6d3-29efc209ceee.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Cuban Jam Sessions in Miniature "Descargas"
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 0xb84d2956c81aeabc01ede4519bc32c010952c4415af86fb07436c4a855dd7990. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/DEXO52476893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71e0eb672120dd8ee6c619c91173d46f3cdfa73760893ea8454b8f41a15ecf3d. Chain 2 (Bitcoin): anchored in block 958617 (2026-07-18T22:07:13Z), 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/DEUE22339997.
Tropical Classics: Cachao (2013 Remastered Version)
Maestro De Maestros Cachao Y Su Descarga
Cachao: More Legendary Descarga Sessions
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e0be708ff8ba440e03e20855841e987436c0baffd7c224458ee6f6cfd4735cf. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/NLHR52080925.
Cuban Music In Jam Session (Digitally Remastered)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33b9896b760988009f964e611ca59cb43cef5171417ac23c3c17c53cce831905. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T13:35:44Z), 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/USLTT1000235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6648681ca3937285dd542505f5792714918df83c7c044c8e8e85ae2b7ed46997. 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/USLTT1000236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6ecc677ec8939b6b4854fe7a6ca3864cc36a045f0260aeb71a4d42934a6b976. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/USLTT1000241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed29193704094548219bcd8318b71444c2e2391dcb6ba3f244f78026bed96117. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-16T00:43:07Z), 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/USLTT1000242.
El Cuarto De Tula (feat. Issac Delgado & Hansel)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5933ed7a831ee56b16bea672b5d34a7f4bdd3142f29b1481268e4e97144e311. 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/USLTT1000247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90be4805320f24a560221a3d461d73af7c3755cf646861acdd9c66d094837f5c. 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/USLTT1000251.
Tropical Classics: Cachao (2013 - Remaster)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbdea635a8d3bf3bf37e5feb7f45b203e678e975c13e1eb20cae803a748e7238. 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/USSA49570053.
Perlas Cubanas: Cuban Music In "Jam Session"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04a5b600a43e3c16242fe2d52c784ff7cc18cd13337148b13d64bc5e599efeef. 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/QM6MZ1414585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18ce003f10aaa42ff971d0739e998adb2d88d289c4c4f754d147b82cdffe64ba. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QM6P41559863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb27a2bb07ea863077d0eb1788b4e1805d5f7744e7080054383c8abfff0a6c566. 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/QMFME1540354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e76f69901f9a509a8a9a60e1b447557355d8c8244239318a8d09a5e24bc5ac2. 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/QMFME1540355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6de4283e54447bfc0e076ea9f26bbbdf58954192899e30c98f9c1213f4b846d. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/QMFME1540356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x010db84c616bf8ae925ffa21d5b977919b9b39be033eef4dab0ba78bfc7d858d. Chain 2 (Bitcoin): anchored in block 958720 (2026-07-19T10:53:46Z), 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/QMFME1540357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bb7522f1479cb09890ab345d65bc8e75038afaf75bc606cd07500f46d7abee5. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/BGA261835802.
Cuban Jam Sessions In Miniature "Descargas"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78acf7baf6a353bf458742a7d89ca5375e6e8c98ab5d38984350453494c1b11c. 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/ES5021800657.