Gregor Bühl (born 1964 in Birkesdorf near Düren) is a German opera and concert conductor and faculty professor of conducting and opera répétition at the University of Music Franz Liszt Weimar. He work
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 0x6ddca96d7b95828ea6a383f6142bc8d8a9c5d3080fc025537985372ff23239db. Chain 2 (Bitcoin): anchored in block 953772 (2026-06-15T10:33:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c4ae48ae-7ebd-479b-9aed-3447b0b63056.json and https://artists.proofprofile.net/proofs/artist/c4ae48ae-7ebd-479b-9aed-3447b0b63056.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Concerto for Clarinet and Orchestra in G Minor, Op. 29: I. Allegro agitato
Rietz, Bruch & Weber: The Romantic Clarinet
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 0x8622893ad2e1d8452a750964f42616d232ffe2be8d92307dee695abb2ea5e037. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DES380002077.
Concerto for Clarinet, Viola and Orchestra in E Minor, Op. 88: I. Andante con moto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1ef1e63b5c0480b2e4f90d66cb52077cb80af994bc9166b787f4ccf9d7e24c4. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DES380002080.
Concerto for Clarinet and Orchestra in G Minor, Op. 29: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x707f29bfdfd2103d991472f30ab5d89216b2e6e1c3931f6c89b476bc344c2200. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DES380002078.
Concerto for Clarinet and Orchestra in G Minor, Op. 29: III. Allegro vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb661db5827e720b89254a43238ba983e774f93c8a71c9c678ecfb950119f1707. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DES380002079.
Concerto for Clarinet, Viola and Orchestra in E Minor, Op. 88: III. Allegro molto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd6003a25e5c459da3875f190358943e8d8e30bf438a3486438553de2dac7b3a. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DES380002082.
Concerto for Clarinet, Viola and Orchestra in E Minor, Op. 88: II. Allegro moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb69fce885fc8e1aa80d606045faa843a6dfda647de7bf10543f673c3d552a717. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DES380002081.
Quintet for Clarinet and String Quartet in B-Flat Major, Op. 34: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1586204512250437ae78a31260c056c53cec382bd0ab9a371266ce89b20b4800. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DES380002083.