The Sia cryptocurrency is live! You can rent storage using siacoins and hosts providing storage to the network receive compensation in the form of siacoins. The storage platform itself is still in beta, and only uploads that are 500mb or less in size are supported by the wallet.
Sia uses a new cryptocurrency, called the siacoin. The developers will mine the first 100 blocks or so before releasing the code + miner to the public. Other than these first blocks, there is no premine for siacoins. The first block reward will be 300,000 siacoins. Each block reward after that will be one siacoin smaller than the previous block reward (299,999, then 299,998, and so on). When the block reward reaches 30,000, all remaining blocks will give a 30,000 siacoin reward. The block time is 10 minutes. Each siacoin is composed of 10^24 indivisible units.