In this case, we have implemented the research on an Android phone (8.1). The crypto wallet application is “unknown”. We were trying to change the contact’s address and research further if we could also change the owner Etherium, Bitcoin and other crypto addresses. We realized that changing owners’ address is more dangerous than fixing contacts’ address because the owner usually does not care about their own address but re-checking recipients’ address is necessary. We all know that IOS device is much harder to jailbreak as well as the percentage of successful rooting it is quite low, it also takes time as well. For an Android device, it is much more straightforward and does not take a long time to make it root. Therefore, borrowing a friend’s phone in 2-3 hours, or even you lost your phone in during the time is really dangerous if you are using any crypto wallet. Why it’s too dangerous?