Every blockchain system is in itself a micro-society, an adaptive organization comprised of network nodes. The operation of this organization is regulated by a consensus mechanism. The consensus mechanism is a programmable benefit transfer rule that engages people, forms a secure network, and operates in an deterministic manner.
In the IOST PoB consensus mechanism, the block production committee has 17 seats, which are changed every 10 minutes. The 17 nodes with the highest Servi are selected for the committee in each round, and then take turns to produce blocks and claim rewards. Each time a node is selected to participate in block production, all committee members consume Servi. Therefore the unselected nodes will have more Servi and will have a greater chance of being selected for the committee in the next round. Under this mechanism, there may be hundreds of different nodes selected for the committee each day.