How Proof of Stake Networks Select Validators Using Randomness and Stake Weight

Proof-of-stake networks select validators through verifiable randomness, where a larger staked balance increases the probability of selection but does not guarantee it. The process relies on three core inputs: an active validator set, each member's effective stake, and a shared random seed — on Ethereum, this seed is provided by RANDAO. Selected validators are assigned distinct duties, with a proposer building the block and attesters verifying and signing it, while conflicting votes can trigger financial penalties known as slashing. Different cross-chain protocols implement their own validator models — Axelar uses delegated proof of stake, LayerZero allows per-application verifier configurations, and Wormhole relies on a governed Guardian set — meaning there is no single universal PoS standard. Experts advise scrutinizing a network's active set, randomness source, committee structure, and slashing rules before treating 'proof of stake' as a blanket security assurance.