Proof of Stake
Description
From the Wikipedia:
"Proof-of-stake is a method by which a cryptocurrency blockchain network aims to achieve distributed consensus. While the proof-of-work method asks users to repeatedly run hashing algorithms to validate electronic transactions, proof-of-stake asks users to prove ownership of a certain amount of currency (their "stake" in the currency). Peercoin was the first cryptocurrency to launch using Proof-of-Stake. Other prominent implementations are found in BitShares, Nxt, BlackCoin, NuShares/NuBits and Qora." (https://en.wikipedia.org/wiki/Proof-of-stake)