https://www.reuters.com/article/us-tesla-crypto-currency/musks-tesla-electrifies-bitcoin-with-1-5-billion-bet-car-payments-pledge-idUSKBN2A81CG >Elon Musk launched a pair of potential gamechanging shifts for bitcoin on Monday, promising Tesla Inc would take payment for its electric vehicles in the currency soon and revealing it had already bought $1.5 billion worth of it.