What if I already did it? Shall I take it as my current address 19RidcN96xgXkWi8gDwxcmbjjdjfrxpxvv's privkey has been compromised? Should I still use that address or change it to another one? As well, if that's not the site I should be using, please take me to something that's trustworthy and could get me a SegWit address. I use GreenAddress and GreenBits apps, they've currently given me with addresses starting with a '3'. Are these addresses just for one time use or can I use them normally just like I use my Legacy address? As I won't be holding private key of such address, is it safe to keep my funds there?