Gualberto Antonio Castro Levario (12 July 1934 – 27 June 2019) was a Mexican singer, actor and television presenter. Castro was best known for singing with Los Hermanos Castro (aka "The Brothers Cast
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 0xef5bf73ccf069dff4398a853c090ce8eb4265839c4e4658321d262abbad76e74. 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/c70d55a6-7831-4ca8-b52e-3b84e4ad0a92.json and https://artists.proofprofile.net/proofs/artist/c70d55a6-7831-4ca8-b52e-3b84e4ad0a92.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 0xbe71dc77cc3da232fed878a8a9dd56592e6419969594796b5ac191b118c73ad8. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/MXF147300113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba604dff8a673c814fa9f85e3b66bf33d99095f2fbd4333e9ac13fdd93035e75. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/MXF147300114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x938a1d2d93777f73ba548ff895d8f140cf63cbc759aa2aed7d52c87448ce0066. Chain 2 (Bitcoin): anchored in block 958523 (2026-07-18T08:54:12Z), 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/MXF147300039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9587c93b30cc52286e5d6f742155eda72c3136e1d8a1943a360db8ed39c08087. Chain 2 (Bitcoin): anchored in block 958947 (2026-07-21T00:53:33Z), 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/MXF147500104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26e4fe72b185953b8ceb509926a06d98e8f17f57cc7f2fd5a29d5cabb115dc26. 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/MXF147300040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56f11157ab60ef913add5c1ff625292038753245c8077ca624aebcb423ca21be. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/QMFME1556980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0981b574a913d0e0d87d583831d70befcc721f0c05bf6e1f631462f0f8e2afe0. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QMFME1556981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6e23def2209bf6656c9bb490281ab88b35ec007ac6442edd42743645932ace3. 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/QMFME1556986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40bf13128facf3724d737754f5a515f4012b13f0221e11e6559cfe5de75d3683. 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/QMFME1556951.
La Gran Coleccion Del 60 Aniversario CBS - Gualberto Castro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x838738735615e4cf9663925f73267f19925b741ef779211f172f29c322f394c1. 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/MXF147300051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9587c93b30cc52286e5d6f742155eda72c3136e1d8a1943a360db8ed39c08087. 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/MXF147500104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x938a1d2d93777f73ba548ff895d8f140cf63cbc759aa2aed7d52c87448ce0066. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/MXF147300039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41fc65d77accbcec1568fbdc4bec995306523237a747ebc597cf7c99e310dbf9. 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/QMBZ91591718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x426f47a8af65bb343b914c90d92beeb887169d9385e55d85a7663902a546ff8b. Chain 2 (Bitcoin): anchored in block 958903 (2026-07-20T15:22:45Z), 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/QMBZ91591720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfc69e35501b8acf814fe0df12479355620344d6bdc7c00111504b651c0046ed. 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/QMBZ91591722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d67f17c158fefcb344598dcb0d791e34cbd65de5bf5098966c30df88feb1c13. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/QMDA61317069.
Gualberto Castro, Vol. 1 (Leyendas de la Música Popular)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40bf13128facf3724d737754f5a515f4012b13f0221e11e6559cfe5de75d3683. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QMFME1556951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56f11157ab60ef913add5c1ff625292038753245c8077ca624aebcb423ca21be. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/QMFME1556980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0981b574a913d0e0d87d583831d70befcc721f0c05bf6e1f631462f0f8e2afe0. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QMFME1556981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce60a9fe32b6f053fc3be62941a3126f94ba3f56835ef06cabcc4f966172d8b9. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/QMFME1556982.
El Amor No Tiene Fronteras (Mariachi Sinfónico)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed35e7a729c393ebf6cee4ce0f1a4e4eb4276f785be6c06966930f4baaee16ad. 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/MXD781804634.
Tesoros de Colección - Los Maravillosos Duetos Que Siempre Recordaremos
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1971c9d4e8c6729b1215425f189417c6de5630362a9a3e82447fd6ca48fb9329. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/MXF148000105.
Algo Más Que un Recuerdo - Tesoros de Colección
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe46ef27902bdf18c756e52ae7c2b247cc9f7cdc4d66980dba6aaa050b9bd9b85. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/MXF147500112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf11e9f6ae8755e2275ce7513dc065f0eae1b13aaf4682e5ab7a5989bf17585fb. 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/MXF147700148.
La Gran Colección del 60 Aniversario CBS - Manoella Torres
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1971c9d4e8c6729b1215425f189417c6de5630362a9a3e82447fd6ca48fb9329. 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/MXF148000105.
Tesoros De Colección - Para el más Grande Amor
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe46ef27902bdf18c756e52ae7c2b247cc9f7cdc4d66980dba6aaa050b9bd9b85. 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/MXF147500112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb848e2ba8b0e20f13272d663e8fcfd4ed1552a7401b8dcdc53fa46a3c21551ca. 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/QM7281589882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbed822674fbae18404b1f1a5dfb3e3afb51a5863609c73d5cdac93299abe078f. 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/QM7281589883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee2c14684d53fb6028380733aea4c3c3de04e7fe6d2e79014b9f93de2417563d. 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/QM7281589884.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93240685635eb6304443deb4a5db918b1a71579d007c644140e1d5fda629555c. 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/QM7281589885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85be2f673623d2a74a7411463799d422ed4d041513d28db5a6861ed2df16d7cd. 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/QM7281589888.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab9da874cc8de72b05e3840da1cc6d6f501c494f42bc69f36f3dea6b4bfe8438. 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/QM7281589889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2bdf3450d1f5ac906387a77e69bc8bb4d7e1e9ffbf5e8ce57e28bdbf9025cb2. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/QM7281589890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccb8b2a8f331c0e283eac6815a211511de9a86c0b8f6b52b8f2e2c235c4517e9. 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/QM7281589891.
Rodrigo De La Cadena / Alberto Angel "El Cuervo"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76d3498f3c4a986a61e71989645757895a958a4bee1f0f2c5050212e8b7a134f. 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/QM7281589892.