Carl Rudolf Hermann Friedberg (September 18, 1872 in Bingen, Germany – September 9, 1955 in Merano, Italy) was a German pianist and teacher of Jewish origin. Biography He was son of Eduard Friedberg
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 0xd8f0fcde828d0b5e52c34a991078429fa142fa8f55c4557634a61290d12ff633. Chain 2 (Bitcoin): anchored in block 953915 (2026-06-16T08:36:32Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1ae8c999-cb7c-4d75-8c79-ddc58c2b2b9d.json and https://artists.proofprofile.net/proofs/artist/1ae8c999-cb7c-4d75-8c79-ddc58c2b2b9d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Miniatures. Hidden Treasures of Heritage Piano
Am Stillen Herd. Opera Transcriptions from the Golden Age
"072 Hidden Treasures of the Piano": Orientale