Full Node is a blockchain network participant that stores the entire blockchain and independently verifies all transactions and blocks according to protocol rules.
Core Explanation (Exam-Focused)
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Complete Ledger Storage
Maintains a full copy of all blocks from the genesis block to the latest block.
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Independent Verification
Validates transactions and blocks without trusting other nodes.
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Protocol Rule Enforcement
Rejects invalid blocks or transactions that violate consensus rules.
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Network Security Role
Strengthens decentralization and prevents fraud.
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Peer Communication
Shares validated data with other nodes.
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No Mining Requirement
A full node may validate without mining or staking.
Full Node vs Light Node
| Aspect |
Full Node |
Light Node |
| Blockchain data |
Entire chain |
Partial data |
| Validation |
Full verification |
Relies on full nodes |
| Trust |
Trustless |
Semi-trusting |
| Resource usage |
High |
Low |
Importance
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Maintains blockchain integrity
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Enables trustless verification
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Supports decentralization
One-Line Definition (Exam Use)
A full node is a blockchain node that stores the complete ledger and independently verifies all transactions and blocks according to network rules.
