Milwaukee police have arrested a 28-year-old North Dakota man who is accused of firing his gun inside a condominium during an argument over a bitcoin transaction.  Jonathan Royce has pleaded not guilty to a charge of recklessly endangering safety.  One participant was arguing in favor of the crypto-currency sale, while Royce wanted to call it off.  Witnesses say he pulled out a gun and fired it once, hitting a stove vent.  Officers recovered a handgun and a deformed bullet from the scene.