O que é Mempool?
The set of valid transactions a node has seen but that are not yet in a block — the queue competing for block space.
When broadcast demand exceeds the roughly four million weight units arriving every ten minutes, the mempool grows and the fee rate needed for prompt confirmation rises. When demand falls, it drains and fees fall.
There is no single global mempool. Every node keeps its own, with its own size limits and relay policies, so published mempool statistics describe one particular node's view.
A large mempool is congestion, not distress, and not a price signal. It reflects competition for block space and nothing else.
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Esta definição faz parte do glossário da Bitcoin Logical. Para a explicação completa, comece por Aprender, ou veja os números ao vivo em O Sinal Bitcoin.