Adam Back warns a post-quantum Bitcoin migration could reveal whether Satoshi's 1.09 million BTC are accessible or lost, Citi finds a gold-and-bitcoin allocation beats bonds in stress cycles, and France logs 41 crypto kidnappings in 2026 at one every 2.5 days. Today's top stories, under five minutes. Full written edition: https://www.btcbreakdown.com/p/issue-523