Blackcoin is a cryptocurrency that is not very know, but the developers are active. As all other cryptocurrencies, it has a distributed ledger (blackchain), and developers continue to develop. It has a proof of stake 3.0 consensus.

Blackcoin inflation is a fixed amount of BLK due to static block reward, and a slightly less inflation rate year on year because of that. The block time target is 64 seconds, so working that out per year (60/64 x 60) x 24 x 365 is 492750 1.5 BLK block rewards in a year which is 739,125 new BLK per year roughly. As of right now, 739,125 is 0.972% of the total supply of 76,034,138 BLK.

Blackcoin is a pure PoS (Proof-of-Stake) coin and can no longer be mined in the usual way. However, you can still mine by what is called Staking. This also serves to secure the network and aid in the various transactions made for all Blackcoin users. Staking will earn you from 1% to 8% (depend on the network weight) of your total amount of coins held in your wallet over the period of a year, and will start as soon as you have unlocked your wallet.

References:
https://tsakf.quora.com/Blackcoin