William Horatio Powell (July 29, 1892 – March 5, 1984) was an American actor, known primarily for his film career. Under contract with Metro-Goldwyn-Mayer, he was paired with Myrna Loy in 14 films, 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 0x6ee168381c689eabf17d8e71e9ef7f35769e4c2f6916a3c6985ffcc660ace663. Chain 2 (Bitcoin): anchored in block 954650 (2026-06-21T04:51:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d9273536-ad34-4577-aaab-2ace369fac3e.json and https://artists.proofprofile.net/proofs/artist/d9273536-ad34-4577-aaab-2ace369fac3e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).