Being trustless is a core principle of blockchain [[Decentralization]] because it allows for unknown or untrusted parties to reach consensus, hence the [[Byzantine Generals Problem]] in distributed computing. Basically, network nodes trust in the system rather than intermediaries (there are none in purely decentralized systems). In verifying cryptographic messages, miners are validating transaction blocks, while other [[Consensus Mechanism|consensus mechanisms]] prove the availability of whatever computing resource it is designed to facilitate the exchange of.