Also I am planning to buy this year mining equipment to mine this Qtum coins.
Qtum model the worlds first digital currency that can execute smart contracts with a Proof-of-Stake consensus mechanism based on an Unspent Transaction Output (UTXO) model. In PoS-based cryptocurrencies the creator of the next block is chosen in a deterministic (pseudo-random) way, and the chance that an account is chosen depends on its wealth (i.e. the stake).