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Jan 14, 2015 at 19:21 comment added Nick @sliders_alpha Good question. It can't be sure. However, generally speaking, collisions like this are possible in many facets of the bitcoin protocol and the protocol basically assumes that these events are so improbable that they can be ignored. If you make the public key offline using some kind of secure algorithm (flipping coins to take the extreme example) it is effectively impossible to duplicate another. For example of another kind of related collision, it is conceivable that two different private key could map to the same public key. Again, we just assume this will never happen.
Jan 13, 2015 at 23:38 comment added sliders_alpha one weird thing tho : if I'm not online, how can the wallet be sure that it has not generated a adress already made by someone else?
Jan 13, 2015 at 23:04 comment added user11221 What is a "permanent" address?
Jan 13, 2015 at 20:48 history answered Nick CC BY-SA 3.0