1. What is Bitcoin public key exposure?
Bitcoin public key exposure occurs when a wallet's public key becomes visible on the blockchain through its address format or transaction history. Although public keys are safe against known practical attacks today, they could become vulnerable to sufficiently advanced quantum computers.
2. How much Bitcoin is exposed to potential quantum computing risks?
According to Glassnode's November 10 findings, approximately 7.12 million BTC, representing 35.4% of issued supply, sits behind publicly visible keys. This figure increased from 6.04 million BTC, or 30.2%, reported in May 2026.
3. Can quantum computers steal Bitcoin from exposed wallets?
A sufficiently powerful quantum computer could theoretically derive private keys from exposed Bitcoin public keys using Shor's algorithm. However, no publicly demonstrated quantum computer currently possesses the capabilities required to execute such attacks against Bitcoin.
4. How can Bitcoin holders reduce public key exposure risks?
Bitcoin holders can reduce certain risks by avoiding address reuse and transferring funds to fresh addresses that do not immediately reveal public keys. They should also maintain secure wallet practices, protect recovery phrases and monitor future security upgrades.
5. What is Bitcoin BIP 360, and how could it improve wallet security?
BIP 360 is a draft Bitcoin Improvement Proposal introducing Pay-to-Merkle-Root outputs to reduce long-term public-key exposure. However, it has not been activated, and comprehensive protection against future quantum attacks may require additional post-quantum signature mechanisms.
