Travel site Expedia will begin accepting the digital cryptocurrency Bitcoin from customers looking to book hotel rooms, the company announced Wednesday. It is the first major travel site to do so. It’s also yet another step in Bitcoin’s slow march into the mainstream. As is often the case when a major retailer begins accepting Bitcoin, the decision happened not through Expedia wanting to fill its own wallet with the futuristic currency, but through a corporate partnership. Coinbase, one of the world’s largest Bitcoin transaction platforms, will handle payments on Expedia’s behalf and convert them to US dollars.