The blockchain enables secure digital business processes. It is considered very difficult to manipulate. This is because it is extended by each participant and miner and stored in a decentralized system.
Once verified, information can thus be confirmed by all participants and new information can be verified by all.
Only when the majority of participants have verified a transaction it is irreversibly documented in the next block of the blockchain. This decentralized approach is also called the peer-to-peer principle. But that doesn't mean you have to be active, the verification process is done automatically.