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 currency is just legal official medium of exchange in  the respective country
currencies doesn't have all the properties on money anymore #tipstr 
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 bitcoin / crypto are NEVER going to be official currency anywhere
just like painting house antic can serve as store-of-value does not make it or them a currency.
making something a legal tender is not necessary a currency legally by law
legal tender or currency cannot be taxed just for changing hands only unless any physical/virtual goods/services in involved in the transaction.