A defibrillator doesn’t actually 'start' a heartbeat but stops it. It is used during CPR when the heart beats irregularly. It’s basically the 'have you tried turning it off and on again' analogy in medicine.

LindseyMorrisN7R

"The other interesting aspect of the Ethereum merge is that with Proof of Stake if we do suffer a 51% attack, we can precisely identify the attacker and eject them from the system. More than that, we can penalize them, including by destroying all their stake. And if they want to do a second attack, they have to rebuy."

Ex-NSA Chief: 'We Kill People Based on Metadata' (2014)

DiamondJuarez40M

"The other interesting aspect of the Ethereum merge is that with Proof of Stake if we do suffer a 51% attack, we can precisely identify the attacker and eject them from the system. More than that, we can penalize them, including by destroying all their stake. And if they want to do a second attack, they have to rebuy."

Basically a CBDC