Proof of Stake is the consensus algorithm on Ethereum 2.0. In PoS, users must stake 32 ETH to become an active validator on the network. For every epoch (32 slots or valid blocks), the network selects a random set of validators to "propose (or produce) blocks or attest (or vote on) the validity of already produced blocks." The scale is composed of the "deposit.go", "attest.go", and "propose.go" source code from Prysm ETH 2.0 and represents the staking of value on the network.