Howard Greenfield (March 15, 1936 – March 4, 1986) was an American lyricist and songwriter, who for several years in the 1960s worked out of the famous Brill Building. He is best known for his success
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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c0a4d000db4e584c7bcb63aebeb3cde4073d7ec03f9d96412d44044ff8474cd. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7c1f0318-f9fa-4542-a0f2-02bc71f10f16.json and https://artists.proofprofile.net/proofs/artist/7c1f0318-f9fa-4542-a0f2-02bc71f10f16.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).