Felix Klieser (born 3 January 1991) is a German professional player of the French horn. He was born without arms. He plays the horn by using the toes of his left foot to operate the valves. The horn i
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 0xab3c1d0e372d74ae94f6b83e078d589d7a4d2b518c58680d62036123246ed898. 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/a5100a88-0deb-49a2-9a22-04ed0f59bfd3.json and https://artists.proofprofile.net/proofs/artist/a5100a88-0deb-49a2-9a22-04ed0f59bfd3.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Reveries (Romantic Music for Horn and Piano)
Romance for Horn and Piano in F Major, Op. 36: Moderato
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 0x90b3e1966dade3bbbd58aca8c2ac92ee3dabbf74659b068bd79be36cdfead407. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/DES380021369 — a six-check JSON result.
Horn Concerto No. 1 in D Major, Hob. VIId:3: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1312ebd6255fb4eec8935d3c0b9c5d1f9e740e9921e361e1be9b9f377f1ab0fb. 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/DES381506001 — a six-check JSON result.
Horn Concerto No. 1 in D Major, Hob. VIId:3: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x104cb217b9badf22f0ccce19d6c02b227c6f4dcc435c5d39b86375afa654f36f. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/DES381506002 — a six-check JSON result.
Horn Concerto No. 1 in D Major, Hob. VIId:3: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb8c2253b56c09d5dc41a4f00c26f74d0d1ea4a79b722b9b01b128a3663840c2. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/DES381506003 — a six-check JSON result.
Horn Concerto No. 2 in D Major, Hob. VIId:4: I. Allegro moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa589e9dc6f872447ee0663ccc01cad28a281e8fe550ba97e509a38de9d8199e. 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/DES381506004 — a six-check JSON result.
Horn Concerto No. 2 in D Major, Hob. VIId:4: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x481a3944de0f46e5b9ee5f394d283012a4d7c84ac9e4ea1ee3d1111c41f8a021. 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/DES381506005 — a six-check JSON result.
Horn Concerto No. 2 in D Major, Hob. VIId:4: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc04e3e3d9320748f47191c2c4cddf14bdcc434d5b4eda36f89b4aa68f56707c8. 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/DES381506006 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bba5cdf101ed4e644e80d2e505ebbf977fc47776dce8eff402d771a50281ad9. Chain 2 (Bitcoin): anchored in block 960199 (2026-07-30T02:30:29Z), 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/DES381506007 — a six-check JSON result.
Concertino in D Major: II. Allegro non troppo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe90819fe8830ed6223dd0bf9ceffaca41d70ec3f996e1985a0bd212a5ca694fe. 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/DES381506008 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc62fd8bceb59f908bb00d0276ce555cdd990472bd001e678090c5037b9e707d2. 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/DES381506009 — a six-check JSON result.
Horn Concerto in E-Flat Major, K. 370 "Allegro": I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf72f6c60854bedd708b6ab10e54936bb0baebbdc631ee46b9a57c525530ab05a. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/DES381506010 — a six-check JSON result.
Horn Concerto in E-Flat Major, K. 371 "Rondo": Rondo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe245d558d647bc1d2dcbeabde34d131e3019d31bd0c41a25ccfe66a759143342. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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/DES381506011 — a six-check JSON result.
Gloria in excelsis deo, RV 589 - Arr. for French Horn
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa66921de8a606808acf7932e2b6817ca9a126ac2cec027582a8b257b0feb6833. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/DES382106001 — a six-check JSON result.
Vergnügte Ruh, beliebte Seelenlust, BWV 170 - Arr. for French Horn
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06fbc6fc68ccbb3b06a7558fd1fd1ef8991ff166fd104c7221bf660662bbbf3c. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/DES382106002 — a six-check JSON result.
Herz und Mund und Tat und Leben, BWV 147: VI. Wohl mir, dass ich Jesum habe - Arr. for French Horn
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94e8c7fee763ad263582410b147492027fb3113b045d1e6b989bf4e0e73d2682. Chain 2 (Bitcoin): anchored in block 958617 (2026-07-18T22:07:13Z), 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/DES382106005 — a six-check JSON result.
Mozart & Haydn for Horn & String Quartet
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73d819263b52d770076fa0e5d90c3dc401be4244875ec296b6cf00811729c7e1. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/DES382345006 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x610285fcf382b2b1bd570451ce0deae43330020c34ffdb676bc1a3160edec60d. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/DES382345008 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x120aad22c677261252b8f30ecf033e98ad7c4ddd10a00f3a5fcd710e11de6a37. 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/DES382406001 — a six-check JSON result.
Concerto in A Minor for Horn & Orchestra, III. Allegro Molto
Soundscape - A Walk in Colours, Op. 118, Part I
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cf5e4e64f1f5a5e0056bcb984ed15bc285c5b3dff643942806922785f59ac00. 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/DES382406003 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cdb85937335d7e78e6bcd727189d50234a213f382908a5113c1252d47d83e34. 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/DES382406002 — a six-check JSON result.