Is OKB proof of stake?

Excuse me, I'm curious about a topic related to cryptocurrency. Could you possibly clarify something for me? I've heard of OKB, and I'm wondering if it falls under the category of proof of stake? I'm trying to understand the consensus mechanisms involved in different cryptocurrencies, and this is one aspect that has piqued my interest. Could you explain how OKB works, and whether it utilizes proof of stake or another method? Thank you in advance for your assistance.