You don’t need to worry about bitcoin overtaking the dollar anytime soon, but part of bitcoin’s ascension as the foremost cryptocurrency has been that now, whether you mine bitcoin or buy bitcoin , there are a variety of places that will accept it as payment. The first ever bitcoin transaction was for two pizzas, and PizzaForCoins. Segregated Witness, or SegWit, increased the capacity of the bitcoin blocks without changing their size limit, by altering how the transaction data was stored.