Ernesto Köhler (4 December 1849 – 17 March 1907) was an Italian flautist and composer. He was considered one of the best flautists of his era. Born in Modena, Köhler was taught the flute by his fathe
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70af658b7809642683662d0011067c5f1abf23544521c785c4ba45c264fa5a3d. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/89fef100-4867-4e38-8187-b0282eec0375.json and https://artists.proofprofile.net/proofs/artist/89fef100-4867-4e38-8187-b0282eec0375.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
ABRSM Flute Exam Pieces 2018-2021, Grade 8
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x784455392c92737d71882f4866cbcca749e7bf0f36439689da187e6745e3e7f1. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLR401600201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcc52cf9b85d3bbb282b4adf7665c853545df4882aab15edca63d908e6f442b2. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLR401600323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f170d24021348e608e1f62dc9e08e8ae6d41578f2d81986abf6b504f48f5f04. 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/PLR401600204.
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
6 Divertissements, Op. 68: No. 5 in G Major (version for solo flute)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8a54a922b8e58f8f4cfc069e1a52a6408f7fb91f784102c7339d3e7ee77249e. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/DEFG21210306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62f29255e8e6152d4e51cbcf4216367afffe61b0b3cc526fbfd0a142213d049c. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/DEFG21210307.
Fantasie in G Minor-major, Op. 28, No. 1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86a646c17f62e6e92b83762c95d2435368fb3ac8a1298b5c0c8daea5a1ab2833. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEFG21210310.
Capriccio sopra un tema arabo in A Minor
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3cc2b948f5a5b07e39d7e9c7fbf29a499954d8e3d8818019a07e2be3155276a. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEFG21210322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6efd69e66bf3e6a21756f9e3e191eb7a3b7dba580fc286f4180d7957bf2d331. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEFG21210323.
25 Romantic Etudes, Op. 66, No. 1: The Swing
Music for Two Flutes on Original Instruments
Trio Sonata in G Major, BWV 1039: I. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc37cb627d65c01f238f4dcb99c95fa56238f0cabd74dcdceaecf8534a85bb3ba. 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/GBAJX8301101.
Trio Sonata in G Major, BWV 1039: III. Adagio e piano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7814ddb0ad24bfab78245a5fab73d22f510dd84d2f524a2fdf646b52aa7f1845. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAJX8301103.
Trio Sonata in F Major, HWV 389 : I. Larghetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7fc86f37488703aa1235012b66fe28361fcc39f5386c55f8cdd0105db682c77. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAJX8301105.
Reinecke, C.: Flute Sonata, "Undine" / Von Der Wiege Bis Zum Grabe / Violin Sonatinas, Op. 108, Nos. 1-3 / Ballade
Flute Sonata, Op. 167, "Undine": I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x084558b22a71e21b0c70ba4a7cef094eda3d2d3f9da496419824b96bfcb4e4d6. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/CH0049301970.
Beautiful Flautists - Eloquent Music-Making
Reinecke: Octet / Von Der Wiege Bis Zum Grabe (From the Cradle To the Grave) / Sextet
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b9d2518816f99fc58d7b3c9a2131a28a4ebf4c0555cb281a7c39be62e100022. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/FRX281962717.
6 Salonstücke, Op. 60: No. 3, Souvenir Russe
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd89039ade29adf1310d36b06f84453b62b764f9f03edfa84e8c24616e16a3384. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRX281962718.
Flute Exam Pieces from 2022, ABRSM Grade 7
A Golden Treasury of Flute Music on Original Instruments
Legacy - 19th Century Virtuoso Duos for Two Flutes and Piano
Musiche originali ed inedite per flauto e pianoforte