Permissionless Networks

Definition ∞ These are networks that do not require explicit authorization or permission from a central authority to join or participate. Anyone can connect, validate transactions, or deploy applications without needing approval. This open accessibility is a defining characteristic of many blockchain systems.
Context ∞ Permissionless Networks are a foundational concept in cryptocurrency, with ongoing discussions about their scalability, security, and governance models. News frequently covers the challenges and benefits associated with maintaining open participation, including issues of spam, Sybil attacks, and the difficulty of enforcing network-wide upgrades. The debate often centers on balancing open access with the need for network integrity and efficient operation.