A hybrid blockchain has a combination of centralized and decentralized features. The precise workings of the chain can differ based on which portions of centralization decentralization are used. A exhausting fork is a rule change such that the software validating based on the old rules will see the blocks produced according to the brand new guidelines as invalid. In case of a tough fork, all nodes meant to work in accordance with the brand new guidelines have to upgrade their software program. If one group of nodes continues to use the old software while the opposite nodes use the model new software program, a permanent break up can happen. For example, bitcoin makes use of a proof-of-work system, the place the chain with the most cumulative proof-of-work is considered the legitimate one by the network.