Stratum Servers: uk1.ghash.io:3333 or us1.ghash.io:3333. Please use -o stratum+tcp://uk1.ghash.io:3333 in your command line. You should name your workers jocoin. (e.g. jocoin.worker1). Workers are added automatically, you can use any/empty password. The minimum stratum difficulty is 16. Support: webmaster@ghash.io