What is the blockchain? Debit cards are emerging that allow you to spend bitcoin — many branded by Visa or Mastercard — and ATMs are popping up in most major cities that let the user buy BTC or exchange it for cash. But what impact is it having in Colorado what s its appeal. Last updated: 23 January New ATM in Denver area dispenses them. How likely would you be to recommend finder to a friend or colleague? There are a limited number of Bitcoin ATMs, where digital mint bitcoin atm denver co get a key printout.