Unconfirmed transactions aren’t secure

Transactions don’t start out as irreversible. Instead, they get a confirmation score that indicates how hard it is to reverse them (see table). Each confirmation takes between a few seconds and 90 minutes, with 10 minutes being the average. If the transaction pays too low a fee or is otherwise atypical, getting the first confirmation can take much longer.
 

Confirm­ations Lightweight wallets Bitcoin Core
0 Only safe if you trust the person paying you
1 Somewhat reliable Mostly reliable
3 Mostly reliable
6 Minimum recommendation for high-value bitcoin transfers
30 Recommendation during emergencies to allow human intervention

 

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