Quote from: erks221 on May 23, 2014, 10:57:07 AM

But I still don't understand, if I make a transaction, does my private key remains the same? For example I have 1 bitcoin and I send 0,1 bitcoin to an other public key, does my private key still be the same? Or after every transaction should I make a new paper wallet?

If you're asking if you should create a new paper wallet after every transaction, then that depends on what you want to do. Some people prefer to be anonymous concerning their transactions and/or balance, so they use a unique address per transaction. That way, no single transaction can be linked to another, helping maintain their relative anonymity. Some casual users who don't care just reuse the same address. I recommend that you create a new paper wallet containing a new key pairing if you feel that it is worth your time to do so. But if you feel that your current paper wallet is adequately secure and anonymous for most intents and purposes, then you can simply reuse the same paper wallet without worry. Just make sure that you don't lose it.