Coinbase, the American cryptocurrency trading giant, has set a reference price for its direct listing at $250 per share. According to the company’s most recent SEC filing, it has a fully diluted share count of 261.3 million, giving the company a valuation of $65.3 billion. Using a simple share count of 196,760,122 provided in its most recent S-1/A filing, Coinbase would be worth a slimmer $49.2 billion. Regardless of which share count is used to calculate the company’s valuation, its new worth is miles above its final private price set…