Wilum Hopfrog Pugmire (born William Harry Pugmire; May 3, 1951 – March 26, 2019), was a writer of weird fiction and horror fiction based in Seattle, Washington. His works typically were published as W
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 0x7e282e4ea2ae6cd2ae70abbb5a69ea35e8f2ada4e227dc8322fe49918ed20349. Chain 2 (Bitcoin): anchored in block 954533 (2026-06-20T08:57:02Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a5356a22-9667-4a0a-b950-c74b2e5aec40.json and https://artists.proofprofile.net/proofs/artist/a5356a22-9667-4a0a-b950-c74b2e5aec40.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).