Which crytocurrency was traded in the highest value on 2016/1/8?
traded in the highest value refers to max(volume_24h); on 2016/1/8 refers to date = '2016-01-08'
SELECT T1.name FROM coins AS T1 INNER JOIN historical AS T2 ON T1.id = T2.coin_id WHERE T2.date = '2016-01-08' AND T2.volume_24h = ( SELECT MAX(volume_24h) FROM historical WHERE date = '2016-01-08' )