José Pascual Antonio Aguilar Márquez Barraza (17 May 191919 June 2007), known as Antonio Aguilar, was a Mexican singer and actor. He recorded over 150 albums, which sold 25 million copies, and acted i
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 0xe3321fbb0ab8f816bbf7cdf8447f2e2b9c41416a082a5bde12bfcab8d0ca6918. 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/40fe2c55-7b98-4e26-af60-3b26cfe7d2a8.json and https://artists.proofprofile.net/proofs/artist/40fe2c55-7b98-4e26-af60-3b26cfe7d2a8.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 0xf8b3c724a18563dde8af3d18b8a3a654ed42e1610c397585c27d287cd8bee074. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/MXF366409739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18e92bc8353b1d74e24658820a592c17382392a73d71011af4410b70f84f90f7. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/MXF366208395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeff2f2957605d2603c0303aa94b8193088dbb9565ba2388f40e752cbfd92d434. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/MXF366409737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea0a89c259a70a39e63b4e7c41ba0e612d7089ab220071b3a14cfd368cdc56bd. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/MXF366207943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1c2d35c1cc254e792932d3ddf9c72aaae342529ad04b4cb8b4a269dabdeaddc. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/MXF366813584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb09e6171e3f47c1fc701906d1152b163fffc71b6ce6254c53b38bf85a31ae0f1. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/MXF366308965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9499a618d081158262043f8401a0994869b7e27eeb4822b11b1cf956b3b4ed8. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/MXF368126147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8c73b845fffaf2449c9b2f273930d954975743fc7615705ed8e61548d39d4a7. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/MXF366207682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc196a470dbe43eb00d23d8f2ab0e8b6ec8a0f6bab02707051470ac7b6e77c1f7. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/MXF365905353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01d1eceb2dda3a6260abc9fc5f0e8736b60b542a8a2eeb2d591d5b0df8cba2b3. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/MXF366409777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x937ac428d23c49d1c840f1bb9f256a1b0d978ae6dbbec76d48f0cbdeb09ff0d7. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/MXF367319129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25fa21a560d358a3b7a51b199002ba0e51d8c4d36a4568711d839dfb8cc4796f. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/MXF367116628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0b320eb6939cb484c88d067e6637b8df1cb348912ced2e5d5c6e139acd64196. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/MXF366006318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9316f0cf1b32aaff167eb27c2c0ffcf982dffc73ec87b4fcb0f1233670ecd81. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/MXF368025730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52e9269a5cf3c4db02a2089a56576ab35151f6e0f61b68a9adf2c1620ede797f. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/MXF368025737.