Louis Gruenberg ( ; June 9, 1964) was a Russian-born American pianist and prolific composer, especially of operas. An early champion of Schoenberg and other contemporary composers, he was also a highl
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 0x6970cdcdf5d53da8ce14fb4dbb39079d708726e83175135a7b8aff5e670a28fd. Chain 2 (Bitcoin): anchored in block 954647 (2026-06-21T04:36:58Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d77400f0-b5fe-4e73-bd12-154f3c41e1b5.json and https://artists.proofprofile.net/proofs/artist/d77400f0-b5fe-4e73-bd12-154f3c41e1b5.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Dohnanyi: Serenade - Gruenberg: Violin Concerto