Sorry sir.

Do I need to do it again?
so sorry my mistake for date
Is my account now safe?

Thank you

Great tutorial, thank you!

Well I experienced the same with my SegWit address. Seems like you cannot verify messages signed with SegWit online, you can do in only in your wallet.
Found this discussion on the subject >
https://bt.irlbtc.com/view/2885058

Hmm will have to try this again then sometime.  Thanks.

Edit, tried the message again with signature:
G8EIXlIsZakYQvCWTgiNVb84EJOzU14OsSHPau40pfjBc2NL989dIK4LW/sNDO42Vf+FiHb94zjuvgLlPt8Bhjk=

Invoking, do not forget to suggest them fill their forum profile with bitcoin addresses which have been signed.
 

I have no clue how to decipher what you said.
Assuming that you have a bitcoin address in a wallet that allows you to sign messeges (example : Bitcoin core or electrum...), you should follow the tutorial made here by shorena. Put your address, add a personalised message (example : today is April 8, 2018, my name is X (id=xx) from bitcointalk.org) then the wallet will give you a signature that others could verify it.
Remember never reveal your private address to anyone. All you have to do is to post here your Bitcoin address (usually starts with 1xxxx...), your message and the signature provided by the wallet.

I helped to recently add most used hardware wallets: Ledger Nano S & Trezor.
Can you please tell us which wallet you want to use? It will be easier to help you.

Quoted for future reference and verified using http://brainwalletx.github.io/#verify?vrAddr=13RpXqjMR9MvRc3iXjydjoW8E9DkkNNeDC&vrMsg=Hi%2C%20I%20am%20Hasan986.%20I%20am%20signing%20this%20message.%20Today%20is%2004%2F29%2F2018.&vrSig=HzVTtGetKUIH3WHggHZLGY3q3thGDA8RrMFXf3RgeB2ZHCqwW%2BeNptPAuui9ks1ibq8hGIlnjBABqXDOZok%2ByPM%3D

Just read the first post of this topic, there you will find tutorial how to sign a message on almost all wallets which allows to do that. Link that you posted is just a tool to verify signed messages.

Did you actually import the Private Key from blockchain.info into Bitcoin Core using the importprivkey command? Or did you just import the "Address"? The error you are getting indicates that you have no imported the private key into your wallet.


Your Bitcoin Core is generating "SegWit" P2SH-P2WPKH addresses (they start with a "3")... Currently, there is no standard method for signing a message using these addresses. You need to generate a "legacy" P2PKH address in Bitcoin Core (starts with a "1")... Then you will be able to sign a message with the "1" address.

To make Bitcoin Core create "1"-type addresses, you need to either start it with the commandline argument -addresstype=legacy or use the following command in the debug console: