Permissionless Blockchain

A permissionless blockchain lets anyone run a node, submit transactions or become a validator without approval from a gatekeeper. Bitcoin and Ethereum are the reference examples: joining requires only software, hardware and, for block production, either hash power or staked capital. This openness is what produces censorship resistance — no company can freeze your address or reverse your payment — and it is why security rests on economic incentives such as mining costs or slashing rather than on contracts. The costs are real too: fees rise with demand, throughput is limited, mistakes are irreversible, and anyone can deploy a malicious contract or token, so due diligence sits entirely with the user rather than with an operator.