THORChain could be called Proof of Stake (PoS) network, but there are some differences to warrant it being called a Proof of Bond network instead. In THORChain the nodes commit a bond (likely around 1,000,000 RUNE) in order to be churned in. However, this bond isn't just used to identify a node (give them a voting slot), it is used to underwrite the assets in the pools. If the node attempts to steal assets, then their bond is deducted to the amount of the assets they stole (1.5x), and the pools are made whole. Additionally, if nodes misbehave their bond is slashed, ensuring reliable service.