Las Cafeteras is a Chicano band from East Los Angeles, California. Their music fuses spoken word and folk music, with traditional Son jarocho and zapateado dancing. History The band started out as st
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 0xe3837b221f0ccbb4c8b5a84b98d174f139b0f6c5a3c32b3b36ab6688e87a1f52. 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/d2f2cf80-e0f1-4edc-b668-0e9cd5e6d95c.json and https://artists.proofprofile.net/proofs/artist/d2f2cf80-e0f1-4edc-b668-0e9cd5e6d95c.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 0x12f7a7f372eb0723e35243ab2b07d3cbb8d85ad88dfb17f4803210eda5ae46e8. 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/USHM91273533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80b96bb011f64010a737436a916a2424da6a39a65e8cce3f6db05b11380cd469. Chain 2 (Bitcoin): anchored in block 958501 (2026-07-18T05:33:04Z), 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/USHM91273535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x065eafc63aa9d08f39806a15d510b9c292a788a1529e95e14cac804779c847f7. 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/USHM91273536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53943cbafb0efb3304b7bee43e1bac432035abae7ca3412c9758122d3ee788a1. 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/USHM91273537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13fee85e70f2eda526c9b6c0bf90cdaaca99a7dfedec773e141928048318c28b. 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/USHM91273540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb4e496ff91dd0b4263f07107902d1422ad719fd4c12e36470344345f1cb7d5b. Chain 2 (Bitcoin): anchored in block 959054 (2026-07-21T20:19:31Z), 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/USHM91273541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec207b2d71ebc982b860ca49a0d8f836e3351a69eb088a93a0ec8aef0d629a80. 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/QM4DW1791169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e68ac917eaa4d8fb9445671444c11634563ea39247afa1ce36bb461b4ba87ea. 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/QM4DW1791171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d8ed18f5bfed14fe120a80c6bc3bde0427f9f9b1287add1719c1fc2609aa2a5. 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/QM4DW1791176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c374fee504e2b3539eacdbc25370464fa3e936f6ae8f9e8736ae07b9afaa5a8. 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/QZNJV2024574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60145869ddb9187b109ca024820d5f199f00636a248ef8b7f5e1e388ac993585. Chain 2 (Bitcoin): anchored in block 956742 (2026-07-05T05:07:15Z), 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/QZNWZ2004284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8067b4c3ba575b928846b363af9d7111c992fed43648409f027d2478a6187815. 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/QZNJV2186364.
Las Cafeteras - Jam in the Van (Live Session, Los Angeles, CA 2022)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2169286a3b8759207c219997a9ea9f52e4b9dbbd110f64ae0a821209ba676e76. 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/QZ5AB2485190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2169286a3b8759207c219997a9ea9f52e4b9dbbd110f64ae0a821209ba676e76. 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/QZ5AB2485190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62b269658b480e0daeb7cfc01abc8113b66d7c0c074b17a1ab58dcf6c7912af7. Chain 2 (Bitcoin): anchored in block 958816 (2026-07-20T03:51:05Z), 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/QZMZ92461603.