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 0x0b5228c8d0f742ae926dab165f3dabc795e7e35295b7f3dc5fd387d538850b75. Chain 2 (Bitcoin): anchored in block 954131 (2026-06-17T19:19:19Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7db34285-2ebb-437e-adb8-21aee7774379.json and https://artists.proofprofile.net/proofs/artist/7db34285-2ebb-437e-adb8-21aee7774379.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Michael Rabin, Vol. 3: Mozart & Tchaikovsky Concertos (Live)
Khachaturian: Violin Concerto; Sibelius: Violin Concerto; Tchaikovsky: Sérénade mélancolique; Souvenir d'un lieu cher (Ruggiero Ricci: Complete Decca Recordings, Vol. 3)
Milestones of a Piano Legend: Sir Clifford Curzon, Vol. 5
Grieg Peer Gynt & Piano Concerto in A Minor
Vocal Recital: Gustavson, Eva - Grieg, E. / Gluck, C.W. / Mahler, G. / Meyerbeer, G. / Saint-Saens, C. / Massenet, J. / Lalo, E. / Bizet, G.
Grieg - Sigurd Jorsalfar Orchestral Suite
Peer Gynt, Op. 23, Act IV: Anitra's Dance
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 0xa684ffea87691cd6ebd1587829527e720ab7abf3ef88db49eebf57528ae217ca. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/GBF075740204 — a six-check JSON result.
Grieg: Peer Gynt Suites Nos. 1 & 2 (Mono Version)
Sibelius: Valse triste & Finlandia - Alfvén: Rhapsodie suédoise No. 1 (Mono Version)
Clifford Curzon: Decca Recordings 1937-1971 Vol.3
Piano Concerto No. 23 in A, K.488: 1. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27c5aa8f3d7de0b028d3c130366c5cb398a08cede8d7e053fe2be9d53340be56. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/GBF074510021 — a six-check JSON result.
Piano Concerto No. 1 in B-Flat Minor, Op. 23, TH 55: 1. Allegro non troppo e molto maestoso - Allegro con spirito
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf29876ca2952ba874a49ff4c781773e1a80cc3c6cf746ece56a6bb4bcf0458db. 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/GBF075810091 — a six-check JSON result.
Piano Concerto in A minor, Op. 16: 1. Allegro molto moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5c13d09ef048451500b49a817521f7d597099fe5cadff0417c1e4ff07752839. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/GBF075910161 — a six-check JSON result.
4 Impromptus, Op. 90, D.899: No. 3 in G flat: Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x844f65dee8e3c4f4827f90c33baf4b0818e13ec1ffc4619c8dc02e4f54026815. 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/GBF076410990 — a six-check JSON result.
Piano Concerto in A minor, Op. 16: 2. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b44e8213135c7c6f9aa7c15b3117c64a58c06d819b3e915bf67232fd0891d08. 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/GBF075910162 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5be8ca6021b183b1f19940377a420e40eb55ccfdfbfdf384886326f696f01cbe. 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/GBF077112260 — a six-check JSON result.
Liebestraum No. 3 in A flat, S.541 No. 3
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa3c4f331a7d11fb44d7a45d24b9f682b6907f37a6d71a7f01ff14d6bf2a75a5. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/GBF076311010 — a six-check JSON result.
Piano Quartet No. 1 in G minor, K.478: 1. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a1751ecb72f854eb00d47860c61d211dc84bdf5d730cfb2ac44954aa1d0a20f. 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/GBF075310141 — a six-check JSON result.
Piano Concerto No. 2 in C Minor, Op. 18: II. Adagio sostenuto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c0dd2f9da8785d2e15765c1fd851afbd53235458f082393fd37670be865e9b5. 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/GBF075511022 — a six-check JSON result.
Piano Quartet No. 1 in G minor, K.478: 2. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06981cfbf03300abe6bf78b96894bd1f644819c27e378425a8f623ca59a87edc. 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/GBF075310142 — a six-check JSON result.
Piano Concerto No. 2 in C Minor, Op. 18: III. Allegro scherzando
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdeab73c39612ed1b453820e6086f765172fe819cd0bfe98af47c186d425bda74. 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/GBF075511023 — a six-check JSON result.
Piano Quartet No. 1 in G minor, K.478: 3. Rondo (Allegro moderato)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x149ec784f281fa7741968d96b159f9d89bb2fca91b2ae74d8df8224a84060b41. 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/GBF075310143 — a six-check JSON result.
Kirsten Flagstad Edition - The Decca Recitals
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2b657ced9cdc03d1e0b66bdc53535c89f7fb35e78afeb8d61db16dd642d5870. 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/GBF075610001 — a six-check JSON result.
Decca Sound: The Analogue Years 1954 – 1968
Winter Classical, Die schönsten Ballette für Weihnachten
Grieg: Piano Concerto - Franck: Symphonic Variations - Litolff: Scherzo
Classical Sleep Music (15 Classical Pieces for Bedtime)