JUST IN: More than 1 in 3 Bitcoin, worth over $500 BILLION, is now exposed to future quantum computers. Glassnode data shows 7.12 MILLION BTC, or 35.4% of supply, has public keys already visible on the blockchain. Most Bitcoin addresses reveal their public key the first time you send from them. Any coins left in that address, or sent to it later, count as exposed. “Moving those coins to a fresh address ends this exposure,” Glassnode says.