Frans Helmerson (born 1945) is a Swedish cellist, pedagogue, and conductor. Biography Helmerson was born in 1945 and by the age of 8 began playing cello. Later on, he studied with Guido Vecchi in Göt
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 0x630deb79b16375b7887866f3c518e2d43e6b2d3544b3ed638658c2c0d427697b. 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/d212d664-8e95-4601-96da-7da0e758c336.json and https://artists.proofprofile.net/proofs/artist/d212d664-8e95-4601-96da-7da0e758c336.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Crumb / Hindemith / Kodaly / Sallinen: Works for Solo Cello
Cello Sonata: I. Fantasia. Andante espressivo e con molto rubato
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 0x88b21a4802bf350afe32a488eeca50ff4a5bd03860b3cb73674d13c33329feb1. 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/SEAEA9225040.
Cello Sonata: II. Tema pastorale con variazioni
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6c610dd88630402b0799d827739a01c06293050a3db30218f7a0944e1f5480d. 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/SEAEA9225050.
Cello Sonata: III. Toccata. Largo e drammatico - Allegro vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cdcd0b04af0931af0c825f7b5f9f299942aa0705f1494cbd2a4a87327fbc0a4. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/SEAEA9225060.
Piano Sonata No. 2 in B-Flat Minor, Op. 35: III. Marche funèbre (Arr. Franchomme for 4 Cellos)
Chopin: Piano Sonata No. 2 in B-Flat Minor, Op. 35: III. Marche funèbre (Arr. Franchomme for 4 Cellos)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e58f5c8581231d9dc90ab0da798d7147d057161c1c3f39e81c0ea83c01568e6. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/FRUM72300317.
24 Préludes, Op. 28: No. 4 in E Minor (Arr. Franchomme for Cello) [Adapted for 4 Cellos by Matthias Spindler]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5092acb62ea05aeb5ad85197f928bbcd0abbe2958ccadc962dfd330a8e043468. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRUM72300313.
24 Préludes, Op. 28: No. 15 in D-Flat Major ''Raindrop'' (Arr. Franchomme for 4 Cellos)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d77dcf7bec9f3de47b09487ef7c0448c7f245d116f84341ecce7e72bea02902. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/FRUM72300316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e58f5c8581231d9dc90ab0da798d7147d057161c1c3f39e81c0ea83c01568e6. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/FRUM72300317.
24 Préludes, Op. 28: No. 13 in F-Sharp Major (Arr. Franchomme for 4 Cellos)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6026172b443c52eba270b0089f97f9f3e62f49d34084d5b05b8265c452f87c28. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRUM72300320.
24 Préludes, Op. 28: No. 9 in E Major (Arr. Franchomme for 4 Cellos)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04f918700bd6b74943a7075866d05a586f7083d3fcf975fc6967ac5434d1927b. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/FRUM72300327.
24 Préludes, Op. 28: No. 20 in C Minor (Arr. Franchomme for 4 Cellos)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91450a613697d3e9e1308f655065c97a101c9a0a3ebb6e54196752ef3aeb0964. Chain 2 (Bitcoin): anchored in block 957084 (2026-07-07T20:41:57Z), 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/FRUM72300328.
The Chopin Project : The Franchomme Legacy
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d77dcf7bec9f3de47b09487ef7c0448c7f245d116f84341ecce7e72bea02902. 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/FRUM72300316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e58f5c8581231d9dc90ab0da798d7147d057161c1c3f39e81c0ea83c01568e6. 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/FRUM72300317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6026172b443c52eba270b0089f97f9f3e62f49d34084d5b05b8265c452f87c28. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRUM72300320.