Héctor Alejandro Daniel Rivera (born May 17, 1952 in Rosario, Santa Fe) is an Argentine pianist settled in Italy. He was awarded prizes at the 1973 Vincenzo Scaramuzza Competition in Buenos Aires (1st
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 0x3791f1d5ac7a45688764c57fca960f93dc2d9c7325c60adc37b11b8718eaf373. Chain 2 (Bitcoin): anchored in block 954035 (2026-06-17T02:39:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3d0efce5-9ee2-470c-8c43-036b108dfa29.json and https://artists.proofprofile.net/proofs/artist/3d0efce5-9ee2-470c-8c43-036b108dfa29.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Martha Argerich - Daniel Rivera - Néstor Marconi, en el Teatro El Círculo de Rosario, Vol. 4, Homenaje a Astor Piazzolla
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 0xfabd340eed7deef4eaf093d8c62d577e5e2600c1ebe58e3fa7ea96e964e6bce9. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/ARF241427401.
"Milonga del Angel", para Dos Pianos, Viola, Contrabajo y Bandoneón
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x544e1848bcdc71dece6e463ab9d53a6a81ba3cafd196ab4929fbff7037b44884. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ARF241427402.
"Oblivión" del Concierto "Aconcagua", "Tema de María", "Verano Porteño", "Cadencia" del Concierto "Aconcagua", "La Muerte del Angel", "Lo que Vendrá", "Decarísimo", para Bandoneón
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49d712743ce610aa2fd770535c105b207395f6531a5baaf2451239554aa8c8d8. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/ARF241427405.
"Para el Recorrido", para Piano, Viola, Contrabajo y Bandoneón
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb5f56cab02812fd67f08ebdb3b9dc3fd2d16aa8089ac1842d336b0a05d222d8. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ARF241427406.
"Libertango", para Piano, Viola, Contrabajo y Bandoneón
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd525d8b2e2fd41df36498433e419ca58c00000a321f79311177abfdb3607b3d. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/ARF241427408.