thumb|Harsányi, date unknown Zsolt Harsányi (27 January 1887 – 29 November 1943), also known as Zsolt von Harsanyi or Zsolt de Harsanyi, was a Hungarian author, dramatist, translator and writer. Bor
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 0x55d95265c30a11a2c9c6af288d247e0948516491ff6385a22940e895c29537e6. Chain 2 (Bitcoin): anchored in block 954603 (2026-06-20T21:47:54Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c3840bd1-dbd2-452f-9a54-71657d6f4c48.json and https://artists.proofprofile.net/proofs/artist/c3840bd1-dbd2-452f-9a54-71657d6f4c48.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
A Guided Tour of the Baroque Era, Vol. 8
Concerto Grosso in B Minor, Op. 6, No. 12: Larghetto
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 0x136feac08dce8a0382713f7dcf7c8f5202a49d97e12c414c81998f60b8c538cd. Chain 2 (Bitcoin): anchored in block 960349 (2026-07-31T05:23:41Z), 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/HKI199358915 — a six-check JSON result.
Concerto Grosso in A Minor, Op. 6, No. 4, HWV 322: III. Largo, e piano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde564fe1c49d51456a365eae56cad66e97199ed8ada01171a59655fe39bfa3fd. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/HKI199248307 — a six-check JSON result.
Concerto Grosso in A Minor, Op. 6, No. 4: Larghetto affettuoso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e095f86e6e9b826e9bf4a09ac5464dacaecd002b196f99e57afed664d5a7818. 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/HKI199248305 — a six-check JSON result.
The City of Prague Philharmonic Orchestra
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc222986782a469b062c09b437ac3b2a487eb084a2e43b2c4f7692415e5870820. 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/DEB631973701 — a six-check JSON result.
HANDEL: Recorder Sonatas, Op. 1, Nos. 2, 4, 7 and 11
Recorder Sonata in G Minor, Op. 1 No. 2, HWV 360: I. Larghetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6119553133e798afc344140d290d7ba0859590c081d6b084cc56fdfeccbeb325. Chain 2 (Bitcoin): anchored in block 960349 (2026-07-31T05:23:41Z), 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/HKI199208901 — a six-check JSON result.
Recorder Sonata in G Minor, Op. 1 No. 2, HWV 360: II. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03242ee4bb0e487b401dcda365700237caae164c637bb131029dc1aa426a1d93. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/HKI199208902 — a six-check JSON result.
Recorder Sonata in G Minor, Op. 1 No. 2, HWV 360: III. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2de708d64509671e582558ffc2bf24554ead18fb98d897329b6d3b9803313d10. 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/HKI199208903 — a six-check JSON result.
Recorder Sonata in G Minor, Op. 1 No. 2, HWV 360: IV. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ba4fcb58331600eef746695b365e7ef35fc6ab903bb9be544f5add713a66d0d. 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/HKI199208904 — a six-check JSON result.
Recorder Sonata in A Minor, Op. 1 No. 4, HWV 362: I. Larghetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95aee802256de61e2946e6e6e11f81c70d8e03a79e8bfb07ad5352341285cd94. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI199208905 — a six-check JSON result.
Recorder Sonata in A Minor, Op. 1 No. 4, HWV 362: II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ba879dde030db7776b2d53e7e6d70042493da0ed3902801e7aa1d6e4dd1a6bc. Chain 2 (Bitcoin): anchored in block 960268 (2026-07-30T14:53:07Z), 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/HKI199208906 — a six-check JSON result.
Recorder Sonata in A Minor, Op. 1 No. 4, HWV 362: III. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4bebb8c6491b37786b81e291becf55e7f3919e06866f6fe4ae7d02e7f6d42d1. 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/HKI199208907 — a six-check JSON result.
Recorder Sonata in A Minor, Op. 1 No. 4, HWV 362: IV. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95c02cda76e6c51d5d50df68fad7bce00603e0280a22e710e0903a7f0fcaeeec. 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/HKI199208908 — a six-check JSON result.
Recorder Sonata in C Major, Op. 1 No. 7, HWV 365: I. Larghetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x751021c514ae90fd05e003a8db9d5c52566380fd8ce71d807c878b240f924f4a. Chain 2 (Bitcoin): anchored in block 960339 (2026-07-31T03:13:37Z), 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/HKI199208909 — a six-check JSON result.
Recorder Sonata in C Major, Op. 1 No. 7, HWV 365: III. Larghetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6ccd35ed37959563fbe01ea0a0ada21d5c43dd56f5fb1a4c2c03e4d94967f01. 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/HKI199208911 — a six-check JSON result.
Recorder Sonata in C Major, Op. 1 No. 7, HWV 365: IV. A tempo di Gavotti
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5c0cc5e198d33f2fc905b1d47a13cb1ac350f737716b3c89504c372f9b8abaa. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/HKI199208912 — a six-check JSON result.
Recorder Sonata in C Major, Op. 1 No. 7, HWV 365: V. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb56c53eadb297c9d2c60cccb4b5ca4f8af77e639e874644a84cec2888d6da915. 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/HKI199208913 — a six-check JSON result.
Recorder Sonata in F Major, Op. 1 No. 11, HWV 369: I. Larghetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7088f4bb963458df946cfc0856acc2039cccc552e797858a58be857d947e3ec. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/HKI199208914 — a six-check JSON result.
Recorder Sonata in F Major, Op. 1 No. 11, HWV 369: II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6021b04f1ba0f0aa44fa7542d8d61309d1c472a5c6945e71c4c69568dc495476. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/HKI199208915 — a six-check JSON result.
Recorder Sonata in F Major, Op. 1 No. 11, HWV 369: III. Siciliana
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5dada05939b16401a4a7c25c9fc58092c18b0bc0c1b33727cf64d4df2782d49. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/HKI199208916 — a six-check JSON result.
Recorder Sonata in F Major, Op. 1 No. 11, HWV 369: IV. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9714e77619a1f866e1967a3b2ea874a2710d40c6273abafb129419f40739a0fb. 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/HKI199208917 — a six-check JSON result.
Recorder Sonata in D Minor, HWV 367a*: I. A tempo di Menuetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa33b0bac582a4b518d083ee5b3e6acbd28c4dd7f01cf664d7b3601723bd2e4d. 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/HKI199208918 — a six-check JSON result.
Recorder Sonata in D Minor, HWV 367a*: II. Andante-Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbbd46f969d1102601f8bde6c2e0e6db3ffa75c41dd61c8b7b3154cb06b34a01. 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/HKI199208919 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4646945cf1ad4337829486575a29d37b6b4edebdaa03e8c9f972240a298e7fbf. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/HKI199208920 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe75e3778f68b739bf942d5f6ac385b53994804c47d909aae6efc8cb27a34e67. 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/HKI199208921 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37c80569c81b1ad1991b7196be285fe584dc2b703c7d394f8e49eeb092a9f498. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI199208922 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d86da04de366d82fd96441af87a06a00d1745e9f943c1113678644501c233a4. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/HKI199208923 — a six-check JSON result.
Trio Sonata in F Major, HWV 405: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23c71e7b7993835f0337d530be2184b05ef0bf82b2d2dcdf7c7d89ce45055353. 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/HKI199208924 — a six-check JSON result.
Trio Sonata in F Major, HWV 405: II. Grave
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d7aa8c58cde74908b49a581a40a4e44c94c42994606a8e79859a3aefa0b57f0. 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/HKI199208925 — a six-check JSON result.
Trio Sonata in F Major, HWV 405: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72074f0b4ee161feeb8e8421d8a485653818bf71bac44d06d07552a494aa91e8. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/HKI199208926 — a six-check JSON result.