Jorge Cardoso [full name: Jorge Ruben Cardoso Krieger] (born 26 January 1949) is a classical guitarist, composer, researcher, medical doctor (National University of Cordoba, Argentina) and teacher (Ma
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 0x78be70cc2b55145fcd33c749776e6067202c7e5608f923a229a4dbd0eea3eb0f. Chain 2 (Bitcoin): anchored in block 954623 (2026-06-20T23:40:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cc0937f8-619c-4e5b-81e0-cb02f411c8ba.json and https://artists.proofprofile.net/proofs/artist/cc0937f8-619c-4e5b-81e0-cb02f411c8ba.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Anima del sur: Milongas and Tango for 2 Guitars
Vocal Music (Argentina and Brazil) - Cardoso, J. / Assad, S. / Cartola, A.
Um Bandolim Que Chora - Jorge Cardoso Interpreta Dinaldo Domingues
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 0x5c4b880bc4a152e0b5c4359f47e9d8560595f61b022918728eeddbb1dc412ced. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US7VG1734005 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc12a3e60399348fbf5faa11a05d79d59943672bc3b36dd4929a471846a89f74b. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US7VG1734007 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf7d66284d2c579674c9d7f46927de2b5a18471278d53eceaa262454ff45dbeb. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US7VG1734010 — a six-check JSON result.
Villa-Lobos, H.: 5 Preludes / Cardoso, J.: Homenaxe A Luis Seoane / Ramirez, A.: Alfonsina Y El Mar / Bilhar, S.: Tira A Poeira
Domeniconi: Chaconne / Villa-Lobos: Guitar Concerto (Excerpt) / Kavanagh: 3 Preludes / Briny Ocean
Pujol, M.: Suite Del Plata, No. 1 / Elegia Por La Muerte De Un Tanguero / Piazzolla: 5 Piezas (Excerpts) / Luna, A.: 3 Estudios (Excerpts)