How a super computer could prevent future exchange hacks
Emin Gün Sirer published a paper this year  that described “Bitcoin vaults”  - a new mechanism for forcing coins to be locking up for a certain amount of time before they can be spent. The idea is for the owner to be able to recover coins during a designated clearing phase whose progress is made publicly visible on the blockchain. The owner could then recover coins from transactions  that he or she didn’t authorize even if their private keys were compromised. This idea is genuinely revolutionary  as currently owners have no way to reverse payments if they get hacked.
If something like this had of existed before the recent Bitfinex hack we might have had a chance to prevent it. Unfortunately, schemes like this rely on having to change Bitcoin’s consensus rules which is a task that’s notoriously difficult to do. Only certain changes to the code can be safely made and it
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