The supposed great strength of BC is its security and transparency, but what's so good about that? It won't abolish financial crime, in fact it seems to have found a niche as the currency of extortion and blackmail presumably because ownership is not actually traceable. And despite its supposed limitations, national currencies have served us reasonably well where the underlying economies are more or less orderly.
But the overwhelming reason BC and similar cryptos should exist is the ludicrous amount of electricity involved in their generation and in transaction processing which must surely write it off as regards having a meaningful share of real transactions. Electronic payments generally cost a few pence but BT is somewhere around £100 a go.
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