What is BlackCoin (BLK)

Blackcoin is an eco-friendly coin because it uses no mining hardware. It uses proof of stake where holders of the currency get a 1to 8% interest per year. The wallet is open source, that is, anyone can look at its source code. The transactions get confirmed quickly. Its privacy features are similar to that of Bitcoin  though there is no personal information in a transaction, the ledger is public and multiple transactions can be linked together. It is supported on 7 platforms and is accepted by many merchants. It also has second layer support like colored coins.