The threat of quantum computers to Bitcoin's security is becoming increasingly real, prompting developers to consider various upgrades to protect the network. Recent research by Google suggests that a sufficiently powerful quantum computer could break Bitcoin's core cryptography in under nine minutes, sparking concerns about the potential compromise of millions of bitcoin tokens. To mitigate this risk, several proposals are being considered, including BIP 360, which removes public keys from the blockchain, and SPHINCS+, a post-quantum signature scheme that uses hash functions to secure transactions.
Other initiatives, 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 threat and ensuring the long-term security of the network.