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yes, i am thinking about that now how lightning helps mitigate this risk.
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For merchants, it's got to be fast. Nobody can wait an hour (6 blocks) for a payment to go through.
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Not in a brick-and-mortar store, but if you are ordering something by mail, you sure can.
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Yeah, that's why I said usually.
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not so serious, Bitcoin is super secure. But it can happen, if they use the timechain (L1). Merchants usually use the Lightning Network because it's got near instant settlement.