Diving Deep into UTXO Mechanics

stacksats · 2025-08-30T12:36:00.000Z

What happens if a transaction tries to spend a UTXO that's already been spent? How do nodes catch that in the mempool and block validation? Is it enough that spent UTXOs just vanish from the mempool?

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ben.matrixNewbie

Posts: 3546 · Reputation: 35

#21Sep 5, 2025, 08:25 AM

For sure! That’s why you can't sync the chain from a pruned node.

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Diving Deep into UTXO Mechanics

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