Ernst Dietrich Adolph Eichner [Ernesto Eichner] (15 February 1740 in Arolsen – early 1777 in Potsdam) was a German bassoonist and composer. Biography Eichner was born to Johann Andreas Eichner (1694–
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 0x795d7cfe0c11a6dbdbb107358e9dbcc64ca43651d06a7c75390570998aef9d32. Chain 2 (Bitcoin): anchored in block 954533 (2026-06-20T08:57:02Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a3cfbad8-13bb-41fd-bf2d-2d391b74941f.json and https://artists.proofprofile.net/proofs/artist/a3cfbad8-13bb-41fd-bf2d-2d391b74941f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Eichner: Flute Quartets Nos. 1-6 (Il Gardellino)
Eichner, E.: Symphonies - Opp. 5, 6, 7, 11
Musik im Jagdschloss Pettersheim - Sinfonien und Konzerte von Ernst Eichner
Violin Concerto in D Major, Op. 9: 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 0x7b3adb29b1e7f4bd042476bbfedc21496de6affa005b2c1f2a5407a2ef2dea92. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/DES380008015.
Violin Concerto in D Major, Op. 9: II. Andantino
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2febee8232493e810b40042c68c6115f92e8ef0dca982578325e3aff065cd05d. 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/DES380008016.
Violin Concerto in D Major, Op. 9: III. Allegro assai
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf292c3a4f5f75cfd926cc3be789858683340139802df18b1c25b5b3d6b92fe9c. 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/DES380008017.