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Monero payments are zero confirmation if the merchant is into UX. Which means 5 to 10 seconds.

Now if the merchant doesn't understand zero confirmation or uses a payment service provider this can go up to 5 or even 10 minutes.

Râu Cao ⚡ 1y ago

Someone at HCPP (in 2019 IIRC) shared an app to try to double-spend UTXOs at the bar, with an almost 50/50 chance of succeeding. They did it only to demonstrate how bad of an idea it is to accept unconfirmed transactions as payment.

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Discussion

Hanshan 1y ago

Not sure thats applicable to Monero but is interesting.

for small payments its probably still fine....?

Râu Cao ⚡ 1y ago

Unconfirmed means unconfirmed. It is what it is.

ede3d957... 1y ago

I would be interested in an answer from a Monero dev.

BCH has DSP (double spending proofs) which make zero confirmation payments safe for merchants.