HORIZON SHIELD

Check Japanese construction and renovation estimates against the open JCCDB dataset (526,128 records) and get Bitcoin-anchored, recomputable fair-price receipts; find contractors that passed the independent fair-price check (YAKUMO); public construction-cost data for Japan and the U.S. (JCCDB, USCCDB) from a separate read-only server. No API key. Two tools append a public ledger record; the rest read.