Trustless

In crypto, trustless does not mean that nobody is trusted at all. It means the rules are enforced by open software and math that anyone can check, so you do not have to rely on the good faith of a bank, an exchange or a counterparty. A Bitcoin node verifies every payment itself; an atomic swap either completes for both sides or for neither.

The idea is central to how projects market themselves: trustless bridges, trustless exchanges, trustless lending. The more a system lets users verify outcomes and exit without permission, the closer it gets to the label. Self-custody and running your own node are the most direct ways for users to reduce the trust they place in others.

Many products described as trustless still involve trust: in the developers who wrote the code, in upgrade keys held by a small team, in oracles, multisig signers or bridge validators. Researchers prefer the term trust-minimised, which describes a spectrum. Several of the largest crypto hacks hit bridges marketed as trustless that relied on a handful of keys.