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Recently I cancelled a pending transaction by resending an other transaction with the same nounce and a higher gas price in order to have the new transaction mined faster. This was useful in my case.

However is it not possible to spam the network by doing this ? What happens if I send thousands of transactions with the same nounce at the same time ? Will they stay in the queue until at least one is being mined ?

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  • Presumably (not on a full computer to look at source code) the mining node software will process transactions in descending order (roughly) of gas price. Thus, you might be able to spam a less-intelligent node and eat up its RAM. A smarter node probably prunes the duplicate with lower gas price. You can always spam the network with garbage transactions that consume CPU cycles and bandwidth and don't cost any ether.
    – lungj
    Sep 10, 2017 at 23:23

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It depends on the node you are connecting to but most of them replace the transaction that has the same nonce and address

In parity, for example here In mantis, here

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