Martin Fröst (born 14 December 1970) is a Swedish clarinettist and conductor. As a clarinettist, he performs internationally and is considered one of the most renowned instrumental soloists ever.
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 0x4348aef76e51ae71c5c9ba4f79e12cebb3e75453b699fa352c75332f231e6ffe. 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/f48f4ddb-f23b-4bcf-9139-b74e3fdf2cd5.json and https://artists.proofprofile.net/proofs/artist/f48f4ddb-f23b-4bcf-9139-b74e3fdf2cd5.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Crusell, B.H.: Clarinet Concertos Nos. 1-3
Clarinet Concerto No. 2 in F Minor, Op. 5: I. Allegro
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 0x5a6d4e2f16b4627eb43df6cef2026ca8442cb3274d4369bb4cb0f5e87c062a0a. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAER0823010.
Clarinet Concerto No. 2 in F Minor, Op. 5: II. Andante pastorale
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee1630bdb7dcec4b1043a9d3a1be3b8eb8d3943e0699737241b5cbe9b04cf36e. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/SEAER0823020.
Clarinet Concerto No. 2 in F Minor, Op. 5: III. Rondo. Allegretto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc82359c3ec3d48c23c1d3167b40b5faf7bdd7debd263cbac70bbfa7e7952bb77. Chain 2 (Bitcoin): anchored in block 960223 (2026-07-30T07:51:46Z), 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/SEAER0823030.
Clarinet Concerto No. 3 in B-Flat Major, Op. 11: I. Allegro risoluto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd04e6958564ea1b9828de1fefecfbc6b7496fd2b8e801d14bc2b903bfb3d727. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAER0823040.
Clarinet Concerto No. 3 in B-Flat Major, Op. 11: II. Andante moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c92b2efae66c67fba74ec754922d11e8786c6ff0c02a36121e9dc7e5d13a141. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAER0823050.
Clarinet Concerto No. 3 in B-Flat Major, Op. 11: III. Alla polacca
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79c814b2321941bfac31e438550529b40959544bd9378f11db1875a3bd6b713a. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAER0823060.
Clarinet Concerto No. 1 in E-Flat Major, Op. 1: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd873d69a62122a29259f4e4a63edcbac4073acb52179187f659a5e71a17d5fad. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAER0823070.
Clarinet Concerto No. 1 in E-Flat Major, Op. 1: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3488dc4cf08404f8207deeffdedc3f23e873028237313d4bf964d55feb28e7d8. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAER0823080.
Clarinet Concerto No. 1 in E-Flat Major, Op. 1: III. Rondo. Allegretto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93f1c3cd522cffda9c507702d9f582d73b7d13dde50c2c1e6edab6c812e9fc5c. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAER0823090.
Close Ups: Music for Clarinet & Percussion
Clarinet Concerto in A Major, K. 622: II. Adagio
Mozart: Clarinet Concerto in A Major, K. 622 & Clarinet Quintet in A Major, K. 581
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c1d0908ffb9d8915b09ae22f8b3c8e6ece4825ccf08a934090a5e823e6ab075. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEM0263020.
Music for a While (from Oedipus, Z. 583)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25672bc4c1be36a97d03dd5837f5f05b4773d2e314571ef21af32b935be6ed37. 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/USSM12109796.
Trio in A Minor for Clarinet, Cello and Piano, Op. 114: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x425791e397272600c840f72c3566d575e99d4541738faafa80c28b19fe1bafa7. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEN0553100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7aa5aa578d1c0a4a57b9b70d8ce97c5e8ccf1672b34d3fab3878fab77ac9472. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM11507923.
Concerto for Clarinet and Orchestra No. 3 in F Major "Il Mezzetino": III. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcee64b115e59c66803606b6a21fc01be687d3a4df6035e707f969cd640a1e425. 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/USSM11906191.