Consensus
Agreement about which valid blockchain history and state the network accepts.
In more detail
Consensus is how participants converge on the same history when competing updates are possible. The mechanism includes ways to select a chain and incentives or penalties for participants. It isn't simply a popularity vote on every payment: nodes still reject data that violates their validation rules.
How you might use it
Two nodes receive competing valid blocks, then follow the protocol's chain-selection rules to converge on the same history.
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