My btc wallet keeps receiving this amount: +0.00000546 every 7-10 days or so. I'm 100% sure that i never registered with it anywhere. I read a few google links regarding this and it's seems it's the lowest amount that can be sent from some wallets. I don't know why i'm receiving this amounts is this a method to analyze and track bitcoin wallets or something similar? Did this happen to anyone else? Very curious what it is because once, it's an accident. Multiple times, it's no accident.