The chain with the most work
Occasionally, more than one valid block may be found at nearly the same time. Nodes follow the valid chain backed by the most accumulated proof of work.
As new blocks are added, one history becomes more clearly established. This is why confirmations matter for payments.
Rules can be discussed, not imposed
People can propose changes to Bitcoin software, but participants are free to choose which software to run. A proposed rule only becomes widely used if enough of the ecosystem voluntarily adopts it.
That voluntary coordination is messy at times, but it is part of what keeps control distributed.
Key Takeaways
Consensus is agreement on Bitcoin's validation rules.
Full nodes enforce rules independently.
Proof of work helps the network select a transaction history.
Software changes require voluntary adoption; no party can impose them alone.
Quick Quiz
What gives a Bitcoin chain priority when two valid histories compete?
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