[Cryptography] Electronic currency revived after 20-year hiatus

[Allen]

> And there's a salient point here; Bitcoin-like solutions
> with a block chain, while reasonable for some applications,
> simply won't scale to (say) 20 billion transactions a day.
> We still need to be thinking hard about e-cash, because it
> is not a solved problem.  If it's ever going to be
> mainstream, something has to replace block chains.
>

Blockchains that can handle 20 billion transaction a day will be here
within a year.
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