Grupo Firme is a regional Mexican band based in Tijuana, Baja California, that specializes in Sinaloan music. Formed in 2014, they have received nominations for a variety of awards that include Latin
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 0xfa338bae9231e76dde85d758fea1fe8f51cfafd343ce73dd13671291edd2118f. 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/afda208c-fe59-4f20-98dc-568c8b900bc4.json and https://artists.proofprofile.net/proofs/artist/afda208c-fe59-4f20-98dc-568c8b900bc4.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 0xa1e485bbd2d3f91a1d6e163b8ff05347e04da085f072f874092bd24cbb7c1e6b. 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/USWL12200718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73bedd0e89b786a4a740e0fd9b865a03e345956679b34ce0d834ba5e73199505. 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/USA2P2356232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x835dba50bd1f99c3343c5ed5dd8473e83e9ac74189116462c66e058f0fbbc022. 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/USA2P2404932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b2a9adc0ec4a265e69f8da18f53246e10de1144557826e0ae676725b9104776. 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/USA2P2421042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9efd7566af55a91b6a73454a2c2b82d6a05a43cc88249d355ae12f39315646d1. 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/DGA062382895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0f2d04020f068d493577f60bab65398aec52d0b310617765a46f80d4397e3e5. 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/USSD12200522.
Se Te Acabo la Suerte (feat. Grupo Firme)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7d59f606f0e51124f082f21c5178718558982d2ca0f86a6dc74f4cd5de4daca. 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/QZDQH1905696.
Corridos Bélicos, Vol. IV (Versión Deluxe)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf79fd39ba774e81a5374402ed521edd836f24444636d3830dd8f239f5b69be94. 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/US3DF2414114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b4df94c8dd8fe0ee573f6987b07a6619029e79b687b977595a040dad920882f. 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/USA2P2328302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bb086d823c91c4574290e72833e22fc907e2a7504c295a075c585955ff8f586. 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/USA2P2360140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc208e4ad28fa066571e969c95423fef46e4fa92e8ff63e26962e6c7faf8d1780. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QM6DC1885805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03116c5f1a3dbdfc6a369b82569922acacffb3e60df29342449f44a4b0b0e23a. 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/QZFZ52008256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe327b3e424c9a00e50b544ad6cc1d0e82de7ba2d55b8f25bb04d7008d85e5f50. 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/USA2P2339109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe918cc1b8ca1cc573fe9770cfec64fe490bad5a54568f0405aa33ae7d631d49b. 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/USA2P2339114.