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?
If you input your private key directly in the site without downloading the webpage and running it in tails then yes, consider that address compromised.
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.
Electrum wallet can generate native segwit addresses (Bech32)
If you want for mobile then Samourai wallet can do that also.
Samourai wallet? Can I use the same address to get paid more than once? Hope it's not the same as Blockchain.info's addresses, as they change once we use it.
I use GreenAddress and GreenBits apps, they've currently given me with addresses starting with a '3'.
Addresses that start with 3 are P2SH addresses, Segwit addresses are P2SH-P2WPKH addresses so they start with 3 also.
IIRC Green Address and Green Bits addresses are multisig Segwit addresses.
Can I use those addresses? Once again, why won't I be able to sign message through these addresses?
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?
You can use ANY bitcoin address as much times as you want as long as you hold the private key.
It is just not recommended because of privacy reasons and the hypothetical future when muh quantum computers will break bitcoin security.
I asked that question for SegWit addresses, not the one that's probably compromised, i.e.; 19RidcN96xgXkWi8gDwxcmbjjdjfrxpxvv
I hope you have withdrown you BTC from your address (19RidcN96xgXkWi8gDwxcmbjjdjfrxpxvv). I checked the address and it has no BTC in it.
It looks like the last tx out of that address was a couple of days ago to the same destination address as previously used, so I think Stedsm's funds are safe.
From searching around it looks like it is not a phishing site it's an open source paper wallet generator
https://github.com/coinables/segwitaddress But as Carlton Banks said NEVER enter a private key into a website and it would best to assume that key is now compromised.
Yes, that transaction was done by me only. And I checked the source, which is why I used my private key there when I was online. I believe I should not receive any coins over that address anymore but should keep it to sign messages. Can you answer my queries told in the same comment?