Permissionless Blockchain
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A permissionless blockchain is a public blockchain that anyone can access without obtaining approval from a gatekeeper. Any person can run a node, submit transactions, or mine — no registration, identity verification, or invitation required.
Permissionless vs. permissioned
| Permissionless | Permissioned | |
|---|---|---|
| Who can join? | Anyone | Invited participants only |
| Who validates? | Anyone (miners/validators) | Pre-approved validators |
| Examples | Bitcoin, Ethereum, Monero | Hyperledger Fabric, R3 Corda, private consortium chains |
| Censorship resistance | High | Low |
Permissioned (private or consortium) blockchains are used by enterprises and governments where controlled access is a requirement. They sacrifice openness for privacy and throughput.
Why permissionless matters
Permissionlessness is the foundation of censorship resistance. Because no authority controls who can participate:
- No one can block a specific user from transacting.
- No one can prevent a miner from including a valid transaction in a block.
- Anyone, anywhere, can hold and transfer value.
Mining on permissionless blockchains
Proof of Work is the original mechanism for achieving permissionless consensus — any miner with sufficient hardware can compete to find the next block. There is no approval process; the protocol itself enforces the rules.
