Karl Hans Berger (March 30, 1935 – April 9, 2023) was a German-American jazz pianist, vibraphonist, composer, and educator. He was a leading figure in jazz improvisation from the 1960s when he settled
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 0x9d99d4cd4705c81f61b1540a2744ddb56091ef5e3c6237416775dfbdb8dbe395. Chain 2 (Bitcoin): anchored in block 954502 (2026-06-20T05:07:36Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9c6e48a6-6c94-4092-b96a-c57140ea7ed1.json and https://artists.proofprofile.net/proofs/artist/9c6e48a6-6c94-4092-b96a-c57140ea7ed1.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Gently Unfamiliar: Suite in 7 Movements for Piano Trio
In a Moment: Music For Piano and Strings