La Diferenzia is an American Tejano music septet group based in San Antonio, Texas. Led by Mexican singer-songwriter Ricardo Castillon, its members included Mexican songwriter Miguel Spindola, saxopho
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 0x8ca0cca009c0196d1cf48e9c37e52058d2194370585d0d81e732e0b5e2695940. 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/9d027cee-a0eb-4e4b-9367-af9981f47907.json and https://artists.proofprofile.net/proofs/artist/9d027cee-a0eb-4e4b-9367-af9981f47907.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 0xc5b3b502f2e933b7ddbd3da3daa6c2a54e31c7cbcc7afbe3cbc40476076793a8. Chain 2 (Bitcoin): anchored in block 958111 (2026-07-15T06:58:20Z), 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/USAR10400412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96d6064d6302391660d9ed3fde0027a85eb73d95984ac046636cc62ec9168bd5. 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/USAR10400421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x743be3c9ccaa1e998aa2c39506c4eeb1770ffe1d9c2e994135bc0ba901405b1e. 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/USAR10400411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42ce0656e07aa8138b5c957c031904d371b2834ae72471f8ef7a2afdaed5d717. 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/USAR10400426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a9fc45f31ddf5f016d9e1104e83b501c6d2c34d19d446e41d35929175c4ef50. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/USAL39700046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56931e99396df82afaf8a098d1c2a828d653286b1d30d39135bf660061577a65. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), 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/USAL39700047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe49474334b3d805ea1d50e55c0d1b9de5a75616d62bbc7e367d15711534107b7. 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/USAL39700048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c7da6557a18f26c823e4c0a2ab66012e40c07b5fcd52a78e3f8d9e21901eb1d. 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/USAL39700049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba0486978d32f1d8634b3205730b8a35b939cc512de75d6d6fec4e792a3119d6. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/USAL39700050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe997506ba6535e3c436fce3708c2f482b109fc6a36cb21248f7c41a4e568d992. 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/USAL39700051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93ffd03e45ebf502f42d7636677d1a96a39fce3afe83fb34629fe4dc5066690c. 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/USAL39700052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2c2018fafb5e125146680717c42670f10af1cfdd65346d0e8f29ddc91df05ef. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/MXF010001170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0616027ef1fde3a253c70078f254075640834a7c11437d74e5aea0ef0f07f323. 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/USAR10400424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef2ee7d98ebf697da2132236d870ce73cf344cd9928abfcb2575a159e5ddd300. Chain 2 (Bitcoin): anchored in block 957039 (2026-07-07T12:58:18Z), 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/MXF019100591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cbee4294dce6b0e4a94138653d439aeb31bcb8f6a71a720760a859e07fc0136. 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/USAR10201966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42249a37d30a700375187e9ca5d0d86db832abbb25203ae58697dd0e39861623. 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/USAR10400428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a9fc45f31ddf5f016d9e1104e83b501c6d2c34d19d446e41d35929175c4ef50. 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/USAL39700046.