Arthur Hayes Cites Address Reuse as Primary Quantum Exposure Rather Than Bitcoin Itself

BitMEX co-founder Arthur Hayes stated that concerns over quantum computing should not prompt investors to sell Bitcoin, pointing instead to address reuse as the primary vulnerability. Reusing an address involves repeatedly receiving and sending funds through the same wallet destination rather than generating new addresses.

While standard computers cannot derive a private key from a public key, advanced quantum computers could theoretically achieve this. Standard Bitcoin addresses conceal the full public key behind a hash until the first outgoing transaction is signed. If an address is continuously used after funds have been spent, any newly deposited tokens sit behind an exposed public key, leaving them susceptible to theoretical future quantum decryption.

The article notes that older address types and Taproot formats expose public keys immediately. Data from Coinbase identified approximately 20,000 addresses holding at least 50 BTC each with revealed keys, while a September analysis found around 6.9 million BTC stored in addresses with exposed public keys. Generating a fresh receiving address for each payment prevents the public key from appearing on-chain before spending.