Cuarteto Zupay or simply Los Zupay, was an Argentinian Popular Music group formed in Buenos Aires in 1966 that remained active until 1991. The founding members were the brothers Pedro Pablo García Caf
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 0x3acdd5288c70fb546bf789c5694f364136628258c78f9ba95224a4d78fa7aa0c. 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/b49bb3cb-03d8-4d36-9f51-465b8ab13ab7.json and https://artists.proofprofile.net/proofs/artist/b49bb3cb-03d8-4d36-9f51-465b8ab13ab7.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Cuarteto Zupay Cronología - Juglares (1970)
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 0x1713337682f8ea289321b1e4ffc42d9534f77ece39085d1c5139d42eae55a112. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/ARF109902384.
Cuarteto Zupay Cronología - Si Todos los Hombres ... (1972)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb652a50d8bc7ad0397273419dc5b3a6961141bf4f22b6b32755b51ff5069516. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/ARF109902377.
Cuarteto Zupay Cronología - Cuarteto Zupay (1973)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x104d70d921c4bba2d5ae2af19b33786f3388b2477ab5a661635838219a178439. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/ARF098100109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62074bb2286ea59bf1a0c8b9226b350faa0ee4480f23fad96de207bbc2e265d2. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/ARF098100111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26b7f94d56371d4d2c864e5fa5c3c285fb8f612375d99a1977d3d45081e4b023. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/ARF098100114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12ba44c05699938f64c5bb1a5580e643cbde9780093c7038e1d96060f95f6787. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/ARF098100116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x940796411c85d62b0ce6c94873869ffb643a4c1956ede583a9476ecb37cdaed0. Chain 2 (Bitcoin): anchored in block 958903 (2026-07-20T15:22:45Z), 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/ARF310500233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fd743ebc3777bd2b11966692ef17c5c1bc1b86b23c45f88431dcdc47b0e8694. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/ARF310500235.