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Is there a code example to how to blackist ongoing tx address ?

  1. I would like to know If I can block the incomming transaction addr is a blacklisted one
  2. How can I know if a particular addr already made a sucessful tx with me.

Do I need to create a list , and how do I map and filter to them.

Note : I am not from the C background, mostly javascript and java. please help

Thank you.