Kolja Lessing (born 15 October 1961) is a German violinist, pianist, composer and academic teacher. His focus as a soloist and chamber musician has been the neglected repertoire by composers who were
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 0xb8a0116e3ab4c5fca563a02786823616f47595efaa2327ecf84238ba2e8f2ce1. Chain 2 (Bitcoin): anchored in block 954035 (2026-06-17T02:39:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3d156efd-f292-488a-99d0-1cae897b7a36.json and https://artists.proofprofile.net/proofs/artist/3d156efd-f292-488a-99d0-1cae897b7a36.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Szekely, Z.: Violin Sonata / Veress, S.: Violin Sonata No. 1 / Bartok, B.: Violin Sonata
Strasfogel, I.: Franz Schreker Book / Scherzo No. 1 / Schreker, F.: Kammersymphonie
Franz Schreker's Masterclasses in Vienna and Berlin, Vol. 2: Piano Sonatas
Lessing, Kolja: Violin Music From Israel
Gemmingen: Violin Concertos - Sperger: Arrival Symphony
Gemmingen: Violin Concertos Nos. 3 & 4 - Gossec: Symphony in D Major, Op. 6 No. 2
Franz Schreker’s Masterclasses in Vienna and Berlin, Vol. 4
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 0x8ac3e069e10705729f09ee7206ebc7d3cda3b8f598a6810869369db1edd44fc3. 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/DEE079402357.