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A comment on 402 Payment Required, and why micropayments are doomed. Parent comment

Re:402 Payment Required, and why micropayments are doomed by CalmStorm on Tuesday May 19, 2020 @08:27PM (#23242013)
If there are two valid, signed transactions that spend the same unspent input transaction (UTXO), only one of them will be included in the block. This is indeed guaranteed by the protocol [1].

[1] https://bitcoin.stackexchange.com/questions/81624/can-two-or...

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Re:402 Payment Required, and why micropayments are doomed by fxtentacle on Wednesday May 20, 2020 @01:36AM (#23243585)
Yes, but "included in the block" means you either wait some hours or pay higher fees.
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