Steve Marcus (September 18, 1939 – September 25, 2005) was an American jazz saxophonist. Biography Marcus was born in The Bronx, New York, United States. He studied at the Berklee College of Music in
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 0xbafd524aa2e0c7e2da09102c931ad6e2c283ff2a8e5680e9bc37da6ffd4001aa. 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/9c15dc1f-de3c-4081-b26c-6a937e10ad78.json and https://artists.proofprofile.net/proofs/artist/9c15dc1f-de3c-4081-b26c-6a937e10ad78.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).