Martin Kuuskmann (born 21 April 1971) is a 3-time Grammy nominated Estonian-American virtuoso bassoonist. Noted for his performances and recordings spanning an extraordinarily wide range of styles, he
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 0x7a161baaa836f352299d6c6aeac348eb0b1d6ac90037d7c0ae7969389bbc39be. Chain 2 (Bitcoin): anchored in block 954346 (2026-06-19T03:51:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/99383ece-f3e0-44a4-9145-6b07acd3c0bd.json and https://artists.proofprofile.net/proofs/artist/99383ece-f3e0-44a4-9145-6b07acd3c0bd.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Theofanidis, Hummel & Mozart: Bassoon Concertos
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 0xc67d5bad8dc3af4fd6449bbc0a53073cba659a501d988ea2b7310aead94ff4d2. 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/EEHA11582101 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f5da8da2f86734886ad9480146aa20e2efc1826e4d0d112e96ac6ee5fda7673. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/EEHA11582102 — a six-check JSON result.
Bassoon Concerto: III. threatening, fast
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e0586e2a48d21b8d5ceb7bfa897d092174c53b185475ceca1a99188124e0b67. 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/EEHA11582103 — a six-check JSON result.
Bassoon Concerto in B-Flat Major, K. 191: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d97a2d90cd469bae0a0a96e189850e26d13624b6bba11c8c66b62ee7878d6cd. 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/EEHA11582107 — a six-check JSON result.
Tõnu Kõrvits, Tamberg & Erkki-Sven Tüür: Works for Bassoon & Orchestra
Bassoon Concerto, Op. 108: II. Interludio - La danza irrequieto. Allegro irrequieto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc01affa4b2fdede2e6b2fb7ad6ee42c65a2b17a6ee3c1adf6432661054e47f1d. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/GBYDS2500278 — a six-check JSON result.
Concerto in E-flat Major for Viola, Strings and Basso Continuo, reconstruction based on BWV 169, 49, 1053; I Allegro
Bach & Telemann Concertos for Viola & Bassoon
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ca000d54974703fe05e23ec0a69b653dd730dfa09ca68ffe7a8142a75c973cd. 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/NOFZS1326010 — a six-check JSON result.
Concerto in C Minor for Bassoon, Viola, Strings and Basso Continuo, Reconstruction based on the version for Violin, Oboe, Strings and Basso Continuo, BWV 1060; I Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33d79fe1ea0d4b798036db04fe17f05d4d33ce1886d2298cbe88738042ca658b. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/NOFZS1326070 — a six-check JSON result.
Concerto in C Minor for Bassoon, Viola, Strings and Basso Continuo, Reconstruction based on the version for Violin, Oboe, Strings and Basso Continuo, BWV 1060; III Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7716337fa23826ce7cf148b8aabc55e8a381594a83416614783c024249c065f. 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/NOFZS1326090 — a six-check JSON result.
Concerto in G Major for Viola, Strings and Basso Continuo; II Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5123e448b636404a4916c0a362aecf3d9aa106cc06b40418f7f67208185219e. 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/NOFZS1326110 — a six-check JSON result.
Concerto in E-flat Major for Viola, Strings and Basso Continuo, reconstruction based on BWV 169, 49, 1053; II Siciliano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3d4a6640a7d767fa1215313852d06ed56c5aca43a69acaef280baa79c53ebe1. 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/NOFZS1326020 — a six-check JSON result.
Concerto in E-flat Major for Viola, Strings and Basso Continuo, reconstruction based on BWV 169, 49, 1053; III Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b71d665711a319d4071247101a8788ab868d9bd38b5b8f1740b0ef9ae08e6f0. 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/NOFZS1326030 — a six-check JSON result.
Concerto in C Minor for Bassoon, Viola, Strings and Basso Continuo, Reconstruction based on the version for Violin, Oboe, Strings and Basso Continuo, BWV 1060; II Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf524524e26d5a190834cc913321c32a010e19d0be045899b4cbcadfe05b1440. 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/NOFZS1326080 — a six-check JSON result.
Concerto in G Major for Viola, Strings and Basso Continuo; I Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e816fca96f0762283e4c4985647a715ee7d83748d60b830f7ba4f73eaef67b2. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NOFZS1326100 — a six-check JSON result.
Concerto in G Major for Viola, Strings and Basso Continuo; III Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b94e68334eb83eacbf4d9ab08672535c277dc692d32342ed6db1e112cb117ce. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NOFZS1326120 — a six-check JSON result.
Concerto in G Major for Viola, Strings and Basso Continuo; IV Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d5c5c800d9c353ab65ae1b83a60c1e08b139bf2d4153674739b0e8d4075a1fa. 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/NOFZS1326130 — a six-check JSON result.
Concerto in G Major for Viola, Bassoon, Strings and Basso Continuo; I Avec douceur
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98248518b9ffe8b27d04724975a8d3804cb0c2c3d5cafc20a485e8f8a0fe4bda. 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/NOFZS1326140 — a six-check JSON result.
Concerto in G Major for Viola, Bassoon, Strings and Basso Continuo; II Gay
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5578e86b3221b8c473db7c4d0842e134a253747b23201d3c4780b4d0816ac7a. 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/NOFZS1326150 — a six-check JSON result.
Concerto in G Major for Viola, Bassoon, Strings and Basso Continuo; III Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfe8a1f82f797b3ce05a3bf01f4ea7e93630241f21111a19e5f48505fdc791e3. 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/NOFZS1326160 — a six-check JSON result.
Concerto in G Major for Viola, Bassoon, Strings and Basso Continuo; IV Vivement
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaba43086d57584982cfb036b8fbfb645e4bb112840b3d73cf99a06fdcdcde6cd. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/NOFZS1326170 — a six-check JSON result.