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 0x7892cac828af92488d0b9ec1cd06e0ba3858ad680924c93d29f52b5ab753caf2. 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/bf7f4604-5091-49d2-a313-2b35fd693a0b.json and https://artists.proofprofile.net/proofs/artist/bf7f4604-5091-49d2-a313-2b35fd693a0b.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
David: Viola Concerto / Sarai: Spring Concerto / Mihaly: Cello Concerto
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 0x5e7c96e4c497293b3314ee7e1bde2ecc7f793369a9b227336ee665d8c120e5aa. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/HUA253198901 — a six-check JSON result.
Viola Concerto: II. Adagio ma non troppo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x629926f9c4b501118176bb968f03da52200d666609553a9eaa2b94deffdbf407. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/HUA253198902 — a six-check JSON result.
Alexandre Rabinovitch-Barakovsky: Anthology of Archaic Rituals - in Search of the Center
Fifty Years of Hungaroton (1951-2001) - Conductors
Mahler: Des Knaben Wunderhorn - Lieder Eines Fahrenden Gestellen
Brahms: Symphony No. 4 - Tragic Overture - Academic Festival Overture
Wagner: Orchestral Highlights From the Operas
Ravel: Bolero / La Valse / Rapsodie Espagnole / Daphnis Et Chloe Suites
Opera 125 (Stars of the Hungarian Opera, Vol. 1/4, 1884-2009)
Lieder eines fahrenden Gesellen, Blumine, Kindertotenlieder
Handel: Music for the Royal Fireworks / Overtures From the Opera Rodrigo, Ariodante and Atalanta
Reti, Jozsef: Arias and Sacred Music by Bach, Vivaldi, Mozart, and Liszt
Huzella / Sarkozy / Vecsey / Kokai: Concertos
Bartók: Symphonic Works, Vol. 2 (Complete Edition)
Liszt: Hungarian Coronation Mass, S11/R487
Ungarische Kronungsmesse (Hungarian Coronation Mass), S11/R487: Kyrie
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9332ff5ce93cec9d9e06bbfc660d5ddfb729b14048ff941117cb02cf89273a34. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HUA251214801 — a six-check JSON result.
Ungarische Kronungsmesse (Hungarian Coronation Mass), S11/R487: Gloria
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0016efa2118a2bc3e60e6536e58af8d2b6e701beaea9ca8f0331e93ac92e91cf. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HUA251214802 — a six-check JSON result.
Ungarische Kronungsmesse (Hungarian Coronation Mass), S11/R487: Graduale
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42c34ae97150665eb4287bcbe3a74540eb629397c934e8fb3040869edd430402. 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/HUA251214803 — a six-check JSON result.
Ungarische Kronungsmesse (Hungarian Coronation Mass), S11/R487: Sanctus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84faa4b42919e5e73958a1be1f5837aaa2baf6d7814963fd12cc8b1394c84325. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/HUA251214806 — a six-check JSON result.
Tarantelle di bravura d'après la tarantelle de La muette de Portici, S. 386
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1292c6e09a94107d60fe95c43cf40ae1acac7cbe7b23680efc0062661edd141. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/HUA253159605 — a six-check JSON result.
Raff: Symphony No. 8 "Frühlingsklänge" & Ode au printemps
Dohnányi: Ruralia Hungarica - Variations on a Nursery Song - Serenade in C Major
Der Schwanendreher: I. Zwischen Berg und tiefem Tal
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3527c9e918256e5afd34e779bbc19a4026a5e5611d818f20a87b1e9989ab742. 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/HUA250014801 — a six-check JSON result.
Der Schwanendreher: III. Variations: Seid ihr nicht der Schwanendreher
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53119645c99ebb8c19e710719165b337f57f48d6f31ca6b872e02df4cf784b35. 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/HUA250014803 — a six-check JSON result.
Brahms: Haydn Variations - Symphony No. 1
Solyom-Nagy, Sandor: Wagner Arias and Mahler's Lieder Eines Fahrenden Gesellen
Kodaly: Peacock (The) / Dances of Galanta / Dances of Marosszeki
Grieg: Piano Concerto / Liszt: Piano Concerto No. 1 / Gershwin: Rhapsody in Blue
Farkas: Sly Students Suite (The) / Concertino All'Antica / Piccola Musica Di Concerto
Debussy: La Mer / Prelude A L'Apres-Midi D'Un Faune / Iberia / Petite Suite (Arr. for Orchestra)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5cc888a02a03f629ee41725d5826009d9cee73987244f4532f08fd31b8f5669. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/HUA251014004 — a six-check JSON result.
Petite suite: I. En bateau (arr. H. Busser for orchestra): III. Menuet
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfeda983ce45cf8b98df9118578742ae8d15b85be86d48135a033bfadd0bb1db4. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/HUA251014010 — a six-check JSON result.
Brahms: Symphonies Nos. 1-4 / St. Anthony Variations / Academic Festival Overture
Die Walküre, WWV 86b, Act III: Ride of the Valkyries
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95796f108de1f53be639694df90bef6bcf40c67717435b41d97f9c59fa61115b. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/DEBL60454212 — a six-check JSON result.