thumb|Ferdinand Küchler around 1893 Ferdinand Küchler (14 July 1867, in Giessen – 24 October 1937, in Leipzig) was a German violinist and violist, renowned violin pedagogue, and composer of instructiv
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 0xf54dd08a5152ca0b3d8ab58434ef91ef2c48a1b255422baad5f238f3e17c86ea. Chain 2 (Bitcoin): anchored in block 953733 (2026-06-15T03:12:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9736c51b-1194-4540-8b85-51986dccb899.json and https://artists.proofprofile.net/proofs/artist/9736c51b-1194-4540-8b85-51986dccb899.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Play It - Study for Violin/Viola: Ferdinand Küchler, Concertino in G Major, Op. 11
Concerto for Violin and Orchestra in G Major: II. Adagio - Cadenza: Ferdinand Küchler
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 0x87593a18e1c54dbb6dfb34945bd98687db088e7936b7b22d9ad5ba49cfccde2a. 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/DEN961700982.
Küchler: Violin concertino Op. 11 in G Major: I. Allegro moderato
Student Violin Concertos: Conciertos para Violín y Piano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe99e0be499cddbae7ea1788736278a155a8c9355ad84490bd1c2b83ad8257651. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ESA011930670.
Küchler: Violin concertino Op. 11 in G Major: II. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34c171b710791beb57e85a98ecb81af6041f80c315e72125b029536a6a4ce2ff. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ESA011930671.
Küchler: Violin concertino Op. 11 in G Major: III. Rondo: Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93cf99fc34af7e91fe306220d807762777863ca05279602bd7a758a113231475. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/ESA011930672.
Küchler: Violin concertino Op. 12 in D Major: I. Allegro moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb6222b4c0de550d2ce03bae7c40062aeba580c828223c2c0aed5aef952f2be1. 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/ESA011930673.
Küchler: Violin concertino Op. 12 in D Major: II. Andante cantabile
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2455a91b61d476252ef62abfb1d76c69e4fb014c2ae200feaf1fbafc60a1c9b4. 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/ESA011930674.
Küchler: Violin concertino Op. 12 in D Major: III. Rondo: Allegreto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd874c2daabfce00cd91953156965ae335871f183246918bc4f8d5e6bcc7cf4ff. 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/ESA011930675.
Küchler: Violin concertino Op. 15 in D Major: I. Allegro moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bafe3a895ed599090f2777a72311b2d623f291d639488ff58a61db54f86735d. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ESA011930676.
Küchler: Violin concertino Op. 15 in D Major: II. Siciliano / III. Allegro assai
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fe679b61554c9756a4758a3f1c95eb5ce747bdee6bffd1772c061e534ce0db2. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/ESA011930677.