Why Transactions Get Stuck
01Every Bitcoin transaction broadcasts to the global network and lands in the mempool — a waiting room for unconfirmed transactions.
Miners pick transactions from the mempool to include in the next block. They prioritize transactions offering the highest fee rate (sat/vB) — satoshis per virtual byte.
When you send with a low fee rate during periods of high demand, your transaction sits at the back of the queue. The mempool can hold thousands of transactions, and a low-fee TX may wait hours or days for confirmation.
Mempool Queue (simplified)