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Bitcoin's Consensus Insight
- Bitcoin's innovation lies in using the longest chain rule for consensus, not proof of work itself.
- Proof of work makes producing a block hard, so the longest chain is trusted as the valid blockchain.
Role of Nodes in Consensus
- Full nodes store entire blockchain copies and validate received blocks.
- Nodes choose the longest chain by waiting for new blocks, ensuring consensus on the blockchain state.
Full Nodes Secure Network
- Full nodes validate blocks to protect themselves from wrong data, not to mine.
- More full nodes improve network quality and decentralized block propagation.