GHash.IO is a bitcoin mining pool which allows mining bitcoins with personal hardware or cloud-based mining power; collectively mining bitcoins worth a total exceeding $200 million in its first year. GHash.IO works in conjunction with CEX.IO bitcoin exchange. Apart from mining bitcoins, GHash.IO hosts a Multipool for mining altcoins, as well as separate pools for mining Litecoin, Dogecoin, Auroracoin and Darkcoin.