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 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 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, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
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 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 0x6407fdccf48060056a5ed20e898475b2a8923b52c7c2b7bb8bba454cb71c8be1. 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/GBEYQ1792408 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x784455392c92737d71882f4866cbcca749e7bf0f36439689da187e6745e3e7f1. 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/PLR401600201 — a six-check JSON result.
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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLR401600204 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcc52cf9b85d3bbb282b4adf7665c853545df4882aab15edca63d908e6f442b2. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLR401600323 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe32c012695734e22027cb65c0a08ff9a006032d7c435605534121febd70068db. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLR401600324 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd763caa89227b1d473250d6671e9f7ee9a70b27840b882b96ca8da59f1517243. Chain 2 (Bitcoin): anchored in block 960429 (2026-07-31T16:07:24Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEFG21210302 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaad5223e631879136b2cd2206da41c624edcc0e977484171ccafffe264d8b523. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/DEFG21210304 — a six-check JSON result.
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 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/DEFG21210306 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62f29255e8e6152d4e51cbcf4216367afffe61b0b3cc526fbfd0a142213d049c. 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/DEFG21210307 — a six-check JSON result.
3 Fantaisies, Op. 38: No. 2. Allegro agitato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca4f6d28fae07adf9c3d4f8578a1cac0388159a0bb0648ee30e1203378fdd7c5. Chain 2 (Bitcoin): anchored in block 960422 (2026-07-31T15:27:29Z), 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/DEFG21210308 — a six-check JSON result.
Fantasie in G Minor-major, Op. 28, No. 1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86a646c17f62e6e92b83762c95d2435368fb3ac8a1298b5c0c8daea5a1ab2833. 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/DEFG21210310 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bda2009ead652f3ab3dd046ad1a383dd435979afca9ff85d9598425f4363360. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEFG21210315 — a six-check JSON result.
Capriccio sopra un tema arabo in A Minor
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3cc2b948f5a5b07e39d7e9c7fbf29a499954d8e3d8818019a07e2be3155276a. 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/DEFG21210322 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6efd69e66bf3e6a21756f9e3e191eb7a3b7dba580fc286f4180d7957bf2d331. 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/DEFG21210323 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e3978f1fd6db3f010a0af2b1d4c9d8865fc4471453e8ea0897d15d9d74c91b0. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/DEFG21210324 — a six-check JSON result.
15 Easy Exercises for the Flute, Op. 33: No. 1 in C Major, Allegro moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e54b38ac6e43c68a289ad7fe79e45973f9278eb8508e99949ef764d437ebc40. 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/ITE952200542 — a six-check JSON result.
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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAJX8301101 — a six-check JSON result.
Trio Sonata in G Major, BWV 1039: II. Allegro ma non presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb581e8823f99790b99cc62c7cb8978fde78ba447c80c0b7d7e8b6461cf5368d8. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/GBAJX8301102 — a six-check JSON result.
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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAJX8301103 — a six-check JSON result.
Trio Sonata in G Major, BWV 1039: IV. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1d85a3675894335ab6557a86d8b1e804babdf06b1d273ba96751d0b16882320. Chain 2 (Bitcoin): anchored in block 960303 (2026-07-30T20:11:13Z), 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/GBAJX8301104 — a six-check JSON result.
Trio Sonata in F Major, HWV 389 : I. Larghetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7fc86f37488703aa1235012b66fe28361fcc39f5386c55f8cdd0105db682c77. 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/GBAJX8301105 — a six-check JSON result.
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 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/CH0049301970 — a six-check JSON result.
Flute Sonata, Op. 167, "Undine": III. Andante tranquillo - Molto vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef05813841dfbc9a0790c190f28b5d6235aefafc1aad2ccbc155e46b5905a2e7. 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/CH0049301990 — a six-check JSON result.
Ballade, Op. 288 (version for flute and piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x714026188785b1eb37587dc4c7b9b976acd2f14b33e68755992318b649825635. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CH0049302090 — a six-check JSON result.
Beautiful Flautists - Eloquent Music-Making
Divertimento - Jazz pour 3 Flûtes et Flûte Alto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd9562c8f62fe57c4608ce7aa46e6990ecd5adde8278bee1b59badc8e38065ac. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/TWE278555002 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb01c0e2232f8a483ea1979fd7a37866f2a6fc7030bf92a1e2584b1164e3880c8. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/TWE278555005 — a six-check JSON result.
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 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRX281962717 — a six-check JSON result.
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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRX281962718 — a six-check JSON result.
Flute Exam Pieces from 2022, ABRSM Grade 7
A:1 Allegro moderato (1st movt from Sonata in D, Op. 1 No. 4)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64a230456f68c624b13708639b77e8f27ce49695a379bc6e9b2bba8c1f48cba7. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBEYQ2181101 — a six-check JSON result.
A:2 Moderato (from Cavatina from Rossini's The Barber of Seville)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8b095a762e55d94d635bc9f7c878a83ae80b73d2f781f126f148c7c597381de. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBEYQ2181102 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d172daffc265a67cbce9644a3f75539a6d63f12d62874c77955c22630c074af. 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/GBEYQ2181104 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fbff5c485121d01ebbe0f9353a3ed2d8687873f7306f8b484bdf9cec7893622. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBEYQ2181106 — a six-check JSON result.
C:1 Etude No. 1 (from Six études pour troisième cycle)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1cd89872a414e8ae838cde0032b5f0d7323a4d4be76b6480b30d10ef514b409. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBEYQ2181107 — a six-check JSON result.
C:3 Allegretto Grazioso and Allegretto Scherzando
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7121d02588dce519fbb00b571a724c8d2e7211eceab507648785dd9291e6f63f. 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/GBEYQ2181109 — a six-check JSON result.
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