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This question already has an answer here:

Is there a way to prove the ownership of an address without spending bitcoins? I Imagine something like signing some given data with the private key - how much would that weaken the security of the bitcoins behind the Address? Any good read on this topic is welcome!

marked as duplicate by Nate Eldredge, Dennis Kriechel, cdecker, Nick ODell, Mathias711 Sep 21 '14 at 8:54

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

  • tanks - was missing the right keyword - now I have them – ligi Sep 18 '14 at 12:42
  • Removed a comment here, because using a spoofed link to refer to lmgtfy is rude. Please rather ask, whether OP has tried looking for "correct keyword", or just flag it as the corresponding duplicate. – Murch Sep 18 '14 at 21:49