Time's Running Out for Bitcoin to Counter Quantum Threat, Putting 6.9 Million BTC at Risk

While not all aspects of bitcoin are vulnerable to quantum computers, the ownership of coins is at significant risk. Bitcoin mining, which uses a type of math called hashing, is not easily broken by quantum computers, ensuring the ledger and the rule of new bitcoin creation through mining would survive. However, the math protecting bitcoin wallets, which turns a private key into a public address, is a different story. A quantum algorithm known as Shor's can collapse the time it takes to reverse this process, potentially allowing an attacker to spend coins from exposed wallets. Approximately 6.9 million bitcoin, including those held by Satoshi Nakamoto, are at risk due to exposed public keys. The recent Taproot upgrade has also expanded the problem by publishing the key protecting remaining bitcoin at an address after a transaction. While Ethereum has a formal quantum-resistant program in place, Bitcoin developers have yet to propose a concrete solution. Various proposals, such as BIP-360 and a detection system by BitMEX Research, have been put forth but lack broad support. The lack of a central authority and a governance process makes it challenging for Bitcoin to coordinate a significant security upgrade. The question remains whether the network can migrate to quantum-safe addresses before the threat becomes a reality.