This is obviously the biggest nonsense, paying with Bitcoin is anonymous so the scammer cannot know who the money came from (there is no sender). The story as described in the mail is therefore incorrect and is not based on truths. Some time ago you checked out some mature sites. On one of these sites i set up a backdoor and your device was contaminated by it. As an example, i know one of several online passwords you utilized was actually wingon. Ive got entrance to all your contacts, your mail accounts, your data, and so on. It is not important how many times you adjust your security passwords, i will continuously posses access to your system using my backdoor.