Robert Gerhard i Ottenwaelder (; 25 September 1896 – 5 January 1970) was a Spanish and British composer, musical scholar, and writer, generally known outside his native region of Catalonia as Roberto
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 0x7ba92bcac0b59d56932dcf55979bbce5ba92d78f030a23306770989e085bb982. Chain 2 (Bitcoin): anchored in block 954027 (2026-06-17T00:55:08Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/39cd0fa4-9a72-4f14-bcac-ffb900622b89.json and https://artists.proofprofile.net/proofs/artist/39cd0fa4-9a72-4f14-bcac-ffb900622b89.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Gerhard: Symphony No. 3, Epithlamion & Piano Concerto
Roberto Gerhard, Schahrazada, Cancionero de Pedrell
Gerhard: Don Quixote, Pedrelliana, Albada & Interludi I Dansa
Gerhard: Symphony No. 4 and Metamorphoses
Gerhard, Vol.1: The Plague - Epithalamion
Gerhard: L'Alta Naixença del Rei en Jaume - Sis Cançons populars Catalanes - Cancionero de Pedrell & Dues Sardanes
Gerhard: Pandora - Soirées de Barcelone & Ariel
Gerhard: Piano Trio, Cello Sonata, Concierto para Ocho & Libra
Gerhard: Symphony No. 3 / Epithalamion / Piano Concerto
Gerhard: Symphony No. 1 & Violin Concerto
Gerhard: Symphony No. 1 / Violin Concerto
Gerhard: Pedrell Symphony & Harpsichord Concerto
Gerhard: Concerto for Harpsichord, String Orchestra and Percussion - Nonet & Concerto for Piano and Strings
Gerhard, R.: Concerto for Orchestra / Symphony No. 2
Gerhard: Symphony No. 2 & Concerto for Orchestra
Roberto Gerhard : Piano Trio, Cello Sonata ,Concierto Para Ocho, Libra
Gerhard: Symphony No. 4 "New York" & Violin Concerto
Gerhard: Symphony No. 4 & Violin Concerto
Gerhard: Complete String Quartets & Chaconne
Gerhard, R.: String Quartets Nos. 1 and 2
Gerhard: Homenaje a Pedrell - Harpsichord Concerto
Gerhard: Symphony No. 4, "New York" & Pandora Suite
Gerhard: The Duenna (Live) [First Performance & Violin Concerto, UK Premiere]
Gerhard: Leo, Gemini, Libra & Concerto for 8
Robert Gerhard - Ballets (For Two Pianos)
Cancionero de Pedrell: No. 1, Sa ximbomba
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 0x4f97acb3ccd9b15fc4abc67a7d38f247e11c926d34d6f841ae2712b0f06e7c27. 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/ES8802200323.
Cancionero de Pedrell: No. 2, La mal maridada
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39b3028b6db005b700fd1bd016cf4ad8e59537978167f5960a7320c2168827a7. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/ES8802200324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf10662ccca382ffc97fb4846d6ed5e79ef11c175c04b829b70134e8c2c0b8ca. 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/ES8802200326.
Gerhard: Don Quixote, Alegrías & Pedrelliana
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fa494ccfb9794388c07ea36f344ca7d1b0a3c1051deee11dc8156ec69835637. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/GBLWD2404301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x814a334a39c0a27856236d045957261f2bb25716f3013124006358c5e5ccd174. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/GBLWD2404302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4550d54019c481989e025339d606f4a816980067e41d14ce19ec11357f84812. 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/GBLWD2404303.
Don Quixote, Scene 1 "Don Quixote's Room": Andante maestoso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4aa05af7260355a93d683da7687d525e54f259edc2967a914e0673e07887310b. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBLWD2404307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09eea8c5b62eee4a967309a6d4292666653d0e4d7c1e107d2730ed331386f63a. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/HKI190739718.