Earlier quoted context omitted.
The tricky part isn't money on a digital ledger. That's easy enough to handle with e.g. a one-off deposit tax (IIRC used as recently as the Euro crisis). There's no operational problem here, it just needs to be legislated to happen. Executing the operation properly might take a while (it's not something they'd have a process for), but banks must already have in place systems for e.g. freezing assets which could be us…
> The real problem is deposits in foreign banks in foreign currencies. Well, money abroad doesn't contribute to local inflation, does it?
Confiscating foreign assets would do little[0] to reduce inflation. But it's the same for local assets. Obviously just chopping off a zero from every note and bank balance doesn't actually reduce inflation, unless accompanied by some other structural changes.
[0] I say "little" rather than nothing, since it could have the effect of repatriating the money -> increasing the exchange rate -> making imports cheaper. But I can't imagine the effect being strong.