Changpeng Zhao says even the most trusted names in hardware storage can’t guarantee full protection, and a newly discovered Coldcard flaw is proving his point. “Nothing is 100%,” the Binance founder wrote on X on August 1, urging crypto holders to stop relying on a single device or seed phrase. His warning followed a Bitcoin theft that exploited predictable key generation inside some Coldcard wallets, a case that has reopened a hard conversation about crypto wallet security and whether offline storage alone is enough to keep funds safe.

The incident didn’t involve stolen devices, phishing links, or careless owners handing over recovery phrases. Instead, it traced back to a flaw buried in firmware that generated wallet seeds…