Poor wallet habits expose 4.12 million BTC to quantum threat

According to the latest on-chain data from Glassnode, approximately 20% of Bitcoin's total supply is exposed to quantum computing attacks due to user behavior and wallet management habits, not flaws in the protocol's design. BeInCrypto reports that this amounts to 4.12 million BTC, a figure 2.1 times greater than the 1.92 million BTC structurally exposed due to older scripts like Pay-to-Public-Key (P2PK). The vulnerability stems from practices such as address reuse and partial spending, which expose public keys on-chain that should otherwise remain hidden behind a hash. This exposure could allow future high-performance quantum computers to reverse-engineer private keys. Glassnode specifically noted that 1.66 million BTC held by exchanges are exposed to this operational risk.