There is at least one legal way to get your euros out of Greece these days, to guard against the prospect that they might be devalued into drachmas: convert them into bitcoin. New customers depositing at least 50 euros with BTCGreece, the only Greece-based bitcoin exchange, open only to Greeks, rose by 400 percent between May and June, according to its founder Thanos Marinos, who put the number at “a few thousand”.