Hashed keys are actually fully quantum secure

In a recent discussion on the Bitcoin Development Mailing List, participants explored an innovative concept related to enhancing the security of Bitcoin transactions against potential attackers. The idea centers around providing a "head start" for transactions that could be set to any desired length. This approach would significantly diminish the capability of an attacker to compete with legitimate transactions by ensuring they cannot match the speed or priority of these shielded transactions.

Further elaboration on this concept highlighted the possibility of integrating a robust Replace-By-Fee (RBF) mechanism. This mechanism would allow users to increase their transaction fees through a new QR signature in cases where the transaction is taking longer than expected to get confirmed. Such an adjustment aims at maintaining the user's transaction competitiveness within the network, ensuring timely processing without compromising security.

The conversation underscores a proactive stance towards Bitcoin's security framework, suggesting that with thoughtful design and technological enhancements, the resilience of Bitcoin against various forms of attacks can be substantially improved.