One of the earliest digital coins, Peercoin (PPC) was released in 2012. It was the first to bring the “Proof-of-Stake” concept to life. Peercoin is a peer-to-peer cryptocurrency and is minable. PPC is widely represented on exchanges. You can also buy this coin for fiat currency.
Nebulas (NAS) coin is based on its own blockchain and functions as the native utility token of the Nebulas system. This cryptocurrency is featured by the number of exchanges.