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Permissionless Layer-1

Definition

A permissionless Layer-1 blockchain is a foundational network where anyone can participate as a validator, submit transactions, or build applications without needing prior authorization. These networks are typically secured by decentralized consensus mechanisms, such as Proof of Work or Proof of Stake. They offer open access and censorship resistance, forming the base layer for numerous digital assets and decentralized applications. Bitcoin and Ethereum serve as prominent examples.