- Permissionless is the opposite of permissioned. Often used in relation to blockchains and DApps. If something is permissionless it is open for anyone to join or participate.
- Permissionless blockchains are also know as public blockchains and permissioned blockchains as private blockchains. If a blockchain has certain hindrances (permissions, like only the team or invites) to become a validator or user, it is considered permissioned. If anyone with an internet connection can join and participate in consensus, it is considered permissionless.