http://www.wired.com/wiredenterprise/2013/06/bitcoin_retai/Since April, the Boston-based online restaurant ordering service, has accepted payments in the world’s hottest digital currency, and sales have grown nicely. Foodler is now doing about $15,000 in Bitcoin food orders per month. This is convenient for customers, and with Bitcoin, the company doesn’t have to fork over the payment-processing fees that come with credit card sales. But there’s a downside: If Foodler isn’t careful, Bitcoin could give competitors a way to spy on its business.