Xavier Patricio Pérez Álvarez (April 11, 1951 – October 18, 1990), known as Gato Pérez, was a musician of Argentine origin who settled in Catalonia. He stood out in the Catalan rumba musical genre, wh
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64bfeca6edaf1f41f78b71d882de812091aaf1b24038b72f091c2f30f6e0dc4a. 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/a79098ae-a526-45b1-a096-8f3d0220989a.json and https://artists.proofprofile.net/proofs/artist/a79098ae-a526-45b1-a096-8f3d0220989a.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f84aea47e31e216f26aa44b2f9e629c8a3dc1bf129b5638710e464a9394f3fc. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T07:21:04Z), 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/ES5060704102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90f5023d85df80346ffc27e6414f4029d2fa43e3ba0c818e2470052cfef5108e. 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/ES5060704103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45e5f96cac48c27eaf66c57cc243b6dd8d34b9b906ac5dbf90b22c3c226823c1. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/ES5060704107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecf69cb0f623a620e75b976bfe6a681e6045b131fee8238cc13366a89e54c717. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T18:29:29Z), 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/ES5060704109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeee183ad08d9259e4d913fbe0624e88634eadf0fbc72d34ec2d1bd93eacce092. 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/ES5089200040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a6984f41d5e9e8f161e722ea8182ccd085b367a4397a58742d452504a3e30fa. 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/ES5060300101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4df4484117bcca598d1a3352b91afd8abe30422a2c6327a3e6efffbfd7735c6b. 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/ES5060300106.
La Rubia del Bar (Banda Sonora Original de la Película)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92debd5e7f2ffdd8ce91787e170209149c9e0fa26998920a116ae53466808307. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), 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/ES6109713106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeeaab356a5efa9fbf217036d989e080e9e57a586dd264ebbe3da1df64ef2b4ec. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/ES7580502086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeeaab356a5efa9fbf217036d989e080e9e57a586dd264ebbe3da1df64ef2b4ec. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/ES7580502086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedef432e72a98335ee66e62c8464f021e1070fa13e23e30854cdd606abe57386. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/ES7580502088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab9ae8673dfa2fa2998a91444a9ce658e0dbde86462f9e79acf018a356c0414b. 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/ES5089801728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed8cf45b610ef231f5077b4daa040f27b87ee39d51439ad863983bac2f01375e. 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/ES5080600844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x412c99de90506c179db8cd8aeddc90b6e0fc612c5fc4f57296ff18eb5b611574. 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/ES5089801723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bbd5cc53fd24103492841863d8aff61e418d1893e31501da34d1842c10fc1d8. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/ES5299100009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb21dd589d40e3a486e250d3bb3e7bcf87fa59b8d25573d1d70cf052f4836069. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/ES5300826331.
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