Doris Drew (born Doris Gruen; August 23, 1927) is an American former singer who performed on radio, television, and records and in personal appearances. Early years Drew (born Doris Gruen on August 2
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 0x2631dfe2df147131bf7389035590e82598700da41a4d730c9182f8e05bf41c01. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4e66a35a-d832-40ce-9e50-93ccdda9cb59.json and https://artists.proofprofile.net/proofs/artist/4e66a35a-d832-40ce-9e50-93ccdda9cb59.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).