Regarding Sentry Nodes, most people only see the mining rewards and overlook its game theory design in network security. This is a typical "1/N trust model": as long as one honest node among tens of thousands worldwide challenges malicious transactions, the network remains secure. This lightweight verification mechanism does not require expensive servers and can be run on a普通笔记本. This greatly disperses the risk of a single point of failure and builds a distributed network that is more censorship-resistant than many PoS public chains.