Bitcoin Interesting Fact — About 20 percent of all Bitcoin that will ever exist is already lost forever. Estimates suggest 3.7 to 4.2 million BTC are locked in wallets with lost private keys, forgotten passwords, or destroyed hardware. At today's prices, that's 300 billion plus dollars in value. How it happens: Hard drives thrown away, passwords forgotten, death without sharing keys, early miners who didn't back up. Unlike gold in a shipwreck, lost Bitcoin is mathematically unspendable. The blockchain knows it exists but nobody can touch it. This makes Bitcoin the hardest money ever created. Not just capped at 21 million — actively shrinking. Every lost key makes everyone else's Bitcoin slightly more scarce. Self custody is a discipline. Your keys, your coins. Lose the keys, lose the Bitcoin. Forever.