Also known as Peercoin, PPCoin aims to promote energy efficiency while keeping most of the original and preferred features found in Bitcoin. (coinchoose.com)
Delegated Proof - of - Stake (DPOS) is a new method of securing a crypto - currency's network, which attempts to solve the problems of both Bitcoin's traditional PoW system, and the PoS system of Peercoin and NXT. (captainaltcoin.com)
Proof of stake first idea was suggested on the bitcointalk forum back in 2011, but the first digital currency to use this method was Peercoin in 2012, together with ShadowCash, Nxt, BlackCoin, NuShares / NuBits, Qora and Nav Coin. (blockgeeks.com)