Why Peercoin is secure and efficient

Peercoin has been using proof-of-work for coin distribution since day one. It has adaptive proof-of-work difficulty, which reduces the amount of mined coins proportional to the rising hash rate.

Proof-of-work (PoW) is not used for chain security and is for distribution purposes only.

Chain security is ensured by proof-of-stake (PoS). Proof-of-stake was invented specifically for Peercoin.

Basically proof-of-stake enables all coins that haven't been moved for 30 days or longer to mint PoS blocks. Minting coins can expect an annual return of 1% through block rewards.