Arturo Castillo, Jr. (born October 16, 1986, in Austin, Texas), better known as AJ Castillo, is an American singer of Mexican descent. He is a cumbia, and Tejano music recording artist, accordionist,
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 0x453d6dbc73e94016fe919f2a3a7cfd47261032490b777b185a6ebc6d830f9e7e. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/04ca70a6-e48e-4d40-aebf-07a7bfd8cf08.json and https://artists.proofprofile.net/proofs/artist/04ca70a6-e48e-4d40-aebf-07a7bfd8cf08.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 0x530d9ef51f1f8d7ea5963a503234a376af2e8d1f5a9467a7ca125853d24e8d45. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/USX9P0910869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b9a66e9fabb74866f391e307cd46e8f7ba7282f4a7a5d201f1d65d60c69f160. 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/USHM21034344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60a194b8bfa657af1299f9504bb0e8f4a239c5fe946de0bc7ad51a1b647935e5. Chain 2 (Bitcoin): anchored in block 957899 (2026-07-13T19:36:39Z), 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/USX9P1205911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e5f8f95aabdecb1918b62159bca0197113977d8e6f9e7ce0cc2e11c41f49cf3. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/USX9P1205913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde2c0988758082a28f738ec17ecf333bce427034a65ee1b37450bc673d738cd2. 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/USX9P1205918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d1120a6cc74f37333831c512e39cd69468d1d671b21f7d66cac2c300b1a85cc. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T18:04:16Z), 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/USX9P1205919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1e4df0de8fb35cf4071e7a6e91412561123cb27e7947e575c4a503ac6ea8311. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/USHM21462482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b3b258e922113f45c1c1b83812a6de5564d86448d7c126da8d136e84faf1ba2. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/USHM21462483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f4d65c0636a835b0d606394fd0a5a15261fd198fd9457a575841b509df1800b. 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/USHM21462484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea0382cdc8a8c1fa24fdc5467df658d779d9fde3c2af838f1c59a855ca566027. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/USHM21462485.
Desde Que Te Bese (feat. Sergio Castillo)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x496782414bc4f0de9170ef95f488c2a7ca0f4378bd49460db5e831ad48103630. 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/USHM21462487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6ca2488c982f81c74e2301832a742e6108090abbe959123153f35e983cb9d66. 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/USHM21462488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87af0dab849be63560c5457b04b115792dbb6a4acb729585c525db9630785765. 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/USHM21462489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64f751662556007b9fcf078cb077bd91f47e3dc7a0fb19f3d19e3b9b5e6b900b. 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/USHM21462490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfeb521b159b897e8a216e22c3af5835aa5ed4fe2b9e3f7a9e980d61013f26d7c. Chain 2 (Bitcoin): anchored in block 960175 (2026-07-30T00:16:15Z), 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/USHM21462486.
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 0x4ee55517582fd0745d8ad121fef6d82e38843f87a9facad528da572987465987. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/USHM21462491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24209c08d0e1841a4563f5616494f2e208161f5ff838647abbea37b75d26c291. 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/USDY41863110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce1ca08a3e653f50e0f4000db3750bf36e3db89df4072fe1bfe4cd91dd9a3edb. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T16:39:04Z), 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/USDY41863112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3d6dcc8b12d2fcd08f3a37c6f1cf31f3a3342e1f3a63c11c2c65a2a801e8fde. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/USDY41863113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c1ef4fb6f649b43667f57d5893958b17dfd974bf0f386619e57303e2e6f1bdc. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/USCGH1967730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x208fce75f98280ccd200f37d34d7e8c7b1f3a84e8f745f00ef892664db341c1c. Chain 2 (Bitcoin): anchored in block 956841 (2026-07-05T22:14:35Z), 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/USCGH2091319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ff890ab8a82a52691cfc89ac782752e1e15bf9d2a7acf1d4b72ecf079812071. Chain 2 (Bitcoin): anchored in block 956484 (2026-07-03T10:47:44Z), 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/USHM92238804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bf45a91f732ca8e5c1bada29a0d079e2939342888a06afa03af575a4501cb9d. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/USMH92393280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6427cb33357278f6e420bd1dc5d2ec22468fbf4bfeb825502ca0b0cbc51dabfd. 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/USX9P2313875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc36f5e4c6faced48dbc6e333cff2f4176485b1315969599586d27cd6b52de11c. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T23:50:04Z), 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/TCAIS2421801.