Abstract
One of the most important component of each corporate network is an intrusion detecting system. But it is a problem to find a mechanism for setting a trust between the nodes in a big distributed system. A blockchain can be used as such kind of mechanism, but most of working blockchains use cases related to cryptocurrencies. So there is no suitable consensus protocol for a permissionless blockchain, which can be used as a part of IDS. In this paper we propose a few modifications to proof of stake consensus protocol to adopt it for using with a blockchain based IDS. Also an agent based model was built to simulate a staking process for our modified consensus protocol. Modeling result will help us to evaluate performance of a blockchain based IDS in a normal state and in some critical situations and to find the most suitable consensus protocol parameters depending on a network size.