The emergence of quantum computers poses a significant threat to Bitcoin's security, prompting developers to consider upgrades to protect the network. Google's recent research suggests that a powerful quantum computer could potentially crack Bitcoin's core cryptography in under nine minutes.
With approximately 6.5 million bitcoin tokens, worth hundreds of billions of dollars, at risk, the stakes are high. To mitigate this threat, several proposals are under consideration, including BIP 360, which removes public keys from the blockchain, and SPHINCS+, a post-quantum signature scheme built on hash functions. Other proposals, such as Tadge Dryja's Commit/reveal scheme and Hourglass V2, aim to protect transactions in the mempool and slow the spending of old coins, respectively. While these proposals are still in development, they demonstrate the Bitcoin community's proactive approach to addressing the quantum computing threat.