2 ms·
Even those are at risk if the key can be cracked in a matter of minutes, since it takes 10 mins on average from publishing your spending transaction to it getti
by tromp 3y ago
Even those are at risk if the key can be cracked in a matter of minutes, since it takes 10 mins on average from publishing your spending transaction to it getting mined, and the attacker can doublespend it with a much larger fee.
- greyface- 3y agoThis is true. Leaving coins at rest is safe, but moving them before the threat is understood might be risky. Widespread opt-in RBF enforcement could mitigate the risk to some degree, if miners cooperate and shun full RBF after a quantum attack. In the worst case, one might need to submit their "exit" transactions directly to a non-evil miner in order to avoid revealing the pubkey before confirmation. Ideally, this will all be figured out ahead of time, and most non-"lost" coins will be moved over to post-quantum UTXOs before the risk is serious.