ShareLedger rotates through the validator set, i.e. block proposers, in a weighted round- robin fashion. The higher the stake (i.e. voting power) that a validator has delegated to them, the more weight that they have, and proportionally more times they will be elected as leaders. To illustrate, if one validator has the same amount of voting power as another validator, they will both be elected by the protocol an equal number of times.