How many times was Bytecoin traded in June 2013?
in June 2013 refers to year(date) = 2013 AND month(date) = 6
SELECT COUNT(T2.coin_id) FROM coins AS T1 INNER JOIN historical AS T2 ON T1.id = T2.coin_id WHERE T1.name = 'Bytecoin' AND STRFTIME('%Y-%m', T2.date) = '2013-06'