Bitcoin's $470B Quantum Computing Vulnerability Exposed

The emergence of quantum computing poses a significant threat to Bitcoin security, according to research from Galaxy Digital. Approximately $470 billion worth of BTC is at risk due to exposed public keys, which are derived from private keys and broadcast to the network when transactions are sent.

Galaxy Digital's research note, published in March 2026, found that around 7 million BTC are held in 'long exposure' addresses. These addresses have been used for transactions at least once, making their public keys visible on-chain. This exposure is a critical vulnerability, as it allows quantum computers to work backwards from the public key to the private key.

The researchers estimate that a quantum machine with 1,200 logical qubits could derive a Bitcoin private key in approximately nine minutes using Shor's algorithm. Currently, no such quantum computer exists, but Google Quantum AI predicts significant advancements by 2033.

Fixing this vulnerability is theoretically straightforward, migrating to post-quantum cryptographic standards would protect against quantum attacks. However, this requires broad consensus among miners, node operators, developers, and users in the decentralized Bitcoin network.