Marshall Barer (born Marshall Louis Barer; February 19, 1923 in Astoria, Queens – August 25, 1998 in Santa Fe, New Mexico) was a lyricist, librettist, singer, songwriter and director. Early career
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 0xc6f7a5921ced1d12529c84cc4b7bfc2e9161198ac79cb44f5dde567132dd2405. Chain 2 (Bitcoin): anchored in block 953877 (2026-06-16T02:39:16Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/01491614-f3a9-4987-8815-950e01fec96a.json and https://artists.proofprofile.net/proofs/artist/01491614-f3a9-4987-8815-950e01fec96a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).