Bitcoin wants you to cut in line: the mempool, visualized.

Every Bitcoin node maintains its own mempool, the holding area for transactions that have been broadcast but not yet mined. There is no single global "the" mempool. Your tx spreads between them in seconds.

Inside one mempool: transactions sort by fee rate, not by arrival order. A tx that broadcasts ten minutes later but pays a higher sat/vB jumps ahead of one that arrived first. Highest rate, first served.

What happens to the cheap ones? Most of them mine eventually, they just wait longer. The mempool drains as blocks come in, and the fee floor drops with it. A 1-5 sat/vB tx that doesn't mine in the next block usually mines within the next dozen.

What about txs below the floor that never make it? After two weeks, the mempool evicts them. But the bitcoin stays in your wallet, the sender retains full custody, and you can rebroadcast at a higher rate. It mines in the next available block.

I just shipped episode 7 of the LearnBitcoin.com rabbit-hole series: The Mempool. Includes a ~one-minute visual walkthrough of the full lifecycle - broadcast, propagation, fee-rate sorting, mining, eviction, rebroadcast. Check it out:

https://www.learnbitcoin.com/rabbit-hole/mempool

Let me know if something or missing or wrong.

Open source. Bitcoin only. No bullshit. Have fun.