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 0xa1ca6f1b9901074f3989264f180d5ff7dd7f5a1e1fd345279dea6e5a99280c2e. Chain 2 (Bitcoin): anchored in block 954693 (2026-06-21T11:50:32Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e459e1c6-3695-4865-aa5a-4b9e19b3b408.json and https://artists.proofprofile.net/proofs/artist/e459e1c6-3695-4865-aa5a-4b9e19b3b408.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Vestiges. Piano Music from the Golden Age
Ständchen. Historical Piano Music by Schubert, Brahms and Grainger
Josef Lhévinne Performs Original Piano Works
Lhevinne, Jozef: Complete Recordings (1920-1937)
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 0x2c1693cc6fbab709e2baedde1b3c57e9c34f5ee79334754044923f07790cf63e. 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/GBLGL1048879 — a six-check JSON result.
Mozart: Concerto No. 7 in F, Lodron (Recorded 1939)
Miniatures. Hidden Treasures of Heritage Piano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3c9303b5ba86b160ab08d9d2c48952b23ae3a5ee713809b1aa5594503a31177. 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/AUAB09950503 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd50252c6707f32a5338736af13b9fcec5f88aefc54adc7a1b7f30ef72b105212. 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/AUAB09950510 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76ae97b28f442f7b642ac9d3b28af0ee0742d5e5705c33e269b415fc5d4dba65. Chain 2 (Bitcoin): anchored in block 960429 (2026-07-31T16:07:24Z), 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/AUAB09950518 — a six-check JSON result.
Der Erlkonig S. 558 - Upon Piano Roll Welte-Mignon 1260, Issued 1906
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9d3c2f5df043fb569481a0f8b7f8613b69c36302482ffa0dc522195aa080e60. 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/DEPI82435230 — a six-check JSON result.
Fantasie, Op. 17 in C Major: I. Durchaus Phantastisch Und Leidenschaftlich Vorzutragen - Upon Piano Roll Welte-Mignon 361, Issued 1905
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3896b50935167d2da56dc213d5995ed87cfdcfcc5b9691619a003a61965ebf5. 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/DEPI82435229 — a six-check JSON result.
Flâneries. Brahms, Saint-Säens and Heritage
Danse Macabre, Op. 40 (Arr. Solo Piano by Franz Liszt) - Upon Piano Roll Duo-Art 0970 Br, Issued 1931
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xede9c2c0f9f687331dd97d5767cd27d42976b0331162d5a09cdd218eaaffd214. 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/DEPI82435271 — a six-check JSON result.
Barber of Seville: Overture (Arr. Solo Piano by Ganz) - Duo-Art 523-4
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51c2959a28064aaf8dca04c4e48067646b0daa6ab24d769d69f06deb77211348. 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/DEPI82313384 — a six-check JSON result.
Wanderer. Schubert & Beethoven from the Golden Age
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe97eaadf8a1863dd57d580d9d2679fe0e2c4662eda580da56815202c8194ae7d. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/USA561240183 — a six-check JSON result.
Nocturnes: No. 1 in B Flat Minor, Op. 9, No. 1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ef3402020ffb60545fb576c6c9e96d3d9515ed0d8d16524c30011b71aae49b7. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/USA561240184 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fc2618f74c3eac97ffab46354b22bc65d7b33227f032d053f899eedb645905b. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/USA561240185 — a six-check JSON result.
Piano Concerto No. 3 in C Minor, Op. 37, II. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x074a4a26e61086e4b2c4e3fb5062666a2ac67ebe4957ed1649d7ed3e86a1714f. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/USA561240187 — a six-check JSON result.
Transcendental Etude No. 3 in F, 'Paysage'
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99265e6a17f81198158c6a4bb70c6c8150ae3a2de1cc153f2240e85aeedca262. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/USA561240188 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a0bcd2da72ed9ae72f664865487e3804077cbb7e490c62a4de3ac2712a7e5bc. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/USA561240191 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x590c0572b25edf7c2a5a8f6a10b839a386801150262a7e9aaf67c9d34bc96f2e. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/USA561240201 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa237065051e6d131247db8eed32ca55cef4fa63476de7ba3d35228bfeaa1ea28. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/USA561240202 — a six-check JSON result.
Cavalleria Leggera: Brilliant Piano from the Golden Age
Funf Charakterstucke, Op. 32: No. 3, Rustle of Spring (Fruhlingsrauschen) - Welte-Mignon 375
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf30eab567cd6d233bd89978bdcaa02a2170e25c3a2a21fb2227fab4bc7105f40. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/DEPI82305677 — a six-check JSON result.
Glissando-Mazurka, Op. 259, No.2 - Due-Art 72128
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d5f84be1d581569a07f69cb0f1d74c30e94b1dd57a49cc8f9247798b0203f4a. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/DEPI82305679 — a six-check JSON result.
The Tales of Hoffmann: Barcarolle - Duo-Art 101936
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc046bdd15d458599356f8a93dd076f6e477088962ef3b69ec780093816158556. 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/DEPI82308753 — a six-check JSON result.
Fruhlingsglaube. Historical Piano Music by Schubert, Brahms and Mozart
Polonaise: Brilliant Piano from the Golden Age
British Folk-Music Settings: No. 4, Shepherds Hey - Welte-Mignon 3790
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fe3e6e9d5b9dda21b4d49b02b3b32bde760d03493d21f4e71beac311b5ee1e5. 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/DEPI82305668 — a six-check JSON result.
Studies, Op. 740: No.5, Octave Study - Welte-Mignon 2430
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf896b922dacbe812b89ea639d309d8e7d3729045694ae6d6c9e75bb7e7fae52d. 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/DEPI82305670 — a six-check JSON result.
Chrysanthemums (Intermezzo) - Duo-Art 67106
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2bd42466c10c9c17db19412f36fc7a1a6efd3c735175f1711140a566a0ba4a4. 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/DEPI82313022 — a six-check JSON result.
Chopin: Œuvres pour piano - La discothèque idéale de Diapason, Vol. 2
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x117c6b2feca07c07e3708bdf3f99fa1d8a47474c099ac523133eae7de9dc33a8. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR9W13800019 — a six-check JSON result.
Coppelia. Brilliant Piano from the Golden Age
Fantasie Impromptu, Op. 66, C-Sharp Minor - Due-Art 6058
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48f692202a352625e197f428e2525ab567ac49a3b7e0f31814213a74935cecf7. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEPI82307339 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc27e113e0707d20532805104071f6550c7089762c57da8db7f7363c1d3f2fe1a. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/DEPI82319218 — a six-check JSON result.
RCA Red Seal Century - Soloists And Conductors
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x912874b97bb1e85c9a1aec8e275b3ab1b30db4147676b862c9f077c04d9aadc1. 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/USBC19000536 — a six-check JSON result.
Études d'exécution transcendante, S. 139: 5. Feux follets in B-Flat Major
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa37bc7fddf471599e4c672acb305917e82cf4a4f4c4bf8623fa0501ad8c9fe3c. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/USBC19600007 — a six-check JSON result.
Schumann: L'oeuvre pour piano - La discothèque idéale de Diapason, Vol. 17
Music for the Funeral of Queen Mary: March
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0924094c7a0164c88d56c7465071bdb249a046926044649ff71689d7e7fdbd5. Chain 2 (Bitcoin): anchored in block 960330 (2026-07-31T00:58:21Z), 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/GBMNA1019736 — a six-check JSON result.
The Caswell Collection, Vol. 5 (1906-1926)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00bf0fe0e7d4a134b9ba78c2c48a3556939a75fafeac678a73e33cf2aaf7c68c. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/USTYQ1000156 — a six-check JSON result.
12 Etudes, Op. 8: No. 12 in D-Sharp Minor (Welte-Mignon piano roll recording)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a116ad588425e14948cf41a1a3dce749eba70b5da8c7fcd826654afbfd72ce2. 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/USTYQ1000159 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44a0af998b4123f64e6d834273da123a2cd4ff374ef955e945e00da4791431a5. 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/GBMNA0913094 — a six-check JSON result.
The Most Relaxing Classical Music In The World
Classical Masterworks: Romantic Classics, Vol. 1
Piano Music - Weber, C.M. Von / Liszt, F. / Mozart, W.A. / Chopin, F. (Welte-Mignon Piano at Hotel Waldhaus Sils Maria, Vol. 1)
Welte-Mignon Piano Rolls, Vol. 1 (1905-1927)
Classical Masterworks: Beautiful 19th Century Classical Music, Vol. 2