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Pro tip for visitors: you can open a channel directly to the point-of-sale system's node. The ATMs offer an "open channel" button, where you can find the node address.

Also, if you were inclined to prove to Paralelní Polis that accepting zero-conf on-chain transactions is a bad idea, there's an Android app called "PayNoWay", which lets you test their system against double-spend attacks. Rumor has it that some people drink beer for free here.

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