Los Cachorros (The Cubs) is a 1973 Mexican dramatic film. Based on the novel The Cubs and Other Stories by the Peruvian writer Mario Vargas Llosa, the film was directed by Jorge Fons and starring José
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 0x625b362454222858339c7a4d6fc26d66f24e9e495dce7ac101d35a8620ae69d4. 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/ad0422ea-3c52-4db4-b2b4-33e264e15795.json and https://artists.proofprofile.net/proofs/artist/ad0422ea-3c52-4db4-b2b4-33e264e15795.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 0x903576836614b16f88242ea1d5e5653ef7166dbb0016d1d300b7206771efc1ac. 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/MXF331111115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c6aacc5812f88a6a3bea5df1e261ba637da4ccddc108d3eddc161b437aada4c. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T12:37:11Z), 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/MXF331111117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb134a0e8f3121d5ef45850735b13013e71f1a91def73cd64a4f5f20e38bcf6b8. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T23:48:01Z), 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/MXF331111119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24d1c6d20bedcb5523283ff4c468477debd4c9c813a88b160d5701a1813a35ec. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T22:21:26Z), 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/MXF331111120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d8e81eb869e5ba60144fad6c9014c40e442a29a485548afe1bd724ceaa319b9. Chain 2 (Bitcoin): anchored in block 958514 (2026-07-18T06:54:37Z), 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/MXF331111124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecab7b3a55ddfc5fe9a2ebcd3080bb2cab8cd5bb4aca95667d59d10a9920d695. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/US2Y30633762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19e3aabc875a49784a1833507b16dbb20ce2587a7c6f9e32ff129aa4c296753d. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-22T00:23:57Z), 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/US2Y30633765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4077bb1b49e996048add6a7480aca708c7b6060cb19178ad9cec4007baea7f4a. Chain 2 (Bitcoin): anchored in block 958404 (2026-07-17T11:34:58Z), 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/US2Y30633771.
24 Corridos (Los Cachorros vs. Dueto Estrella)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c742419873c921bb9972ae5df8608a8759304a3e09330f7a77721978a5c66e7. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/USHM21477742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x957f389842b073c24d2551ddda85a7fadb13a1d78ec42dbf3e8614db4bf9c410. Chain 2 (Bitcoin): anchored in block 958873 (2026-07-20T11:48:10Z), 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/USLZJ1944591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa831947e79a101504650af7920686d4961dc2eb8aca55c8c7bc2f00be64adf64. 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/USLZJ1937509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa45bb0d519e17c6f862068bb5e59f4f1de6df38617e8dc16f61623b4397b3c34. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T04:28:40Z), 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/USLZJ1937515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefd6587cbecbd9db85ed8de9780bbeb3dc9f19cf0a51b7fb65d1d5ea61f43f3f. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T11:28:29Z), 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/USLZJ1937527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd58720a3cb564eeba829300e4767fe0f8345ea82edd3e3b4958e31ff119c91f. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/TCAHH2340642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51b290197630fd9aa44e691b27c2b78dc0bc5f54a3244ca7c3dcc5ef93ae39ac. 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/TCAHH2340645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ab8960fbbd872fe5f3318a0572f2f9ed55e207bee3219ccc8ea02fd4917fc6b. 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/TCAHH2340648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8950e7e0af75b776ee5debd6a6158386635cabbd629d0c3320e025dc6a048b9. 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/TCAHH2340658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcddfe250c48ed0d61937a181b7a2fed108f3a78f6ea8242748f5b264892e42c. Chain 2 (Bitcoin): anchored in block 958639 (2026-07-19T01:18:30Z), 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/TCAHH2343318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb27866082e6e8e91bc10dcfaa28343494f85679e65e60b56963e3878f23ed92. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/TCAHH2343355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5f58eb1c26abc1ad65663a5ec16d6669c155ec78c47418369e70863af8d0e2c. Chain 2 (Bitcoin): anchored in block 958987 (2026-07-21T11:33:35Z), 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/TCAHH2343370.