Quote from: hacker1001101001 on April 30, 2020, 10:48:15 AM

Quote from: Alexa ale on April 30, 2020, 10:23:13 AM

But finally I noticed one of my topic today. I have posted a tx link there. And I have made this tx from my blockchain wallet. Here is the post:: https://bitcointalk.org/index.php?topic=1869324.msg18580720#msg18580720
But I can't sign the address. Can you tell me how to sing address on blockchain? Will it be okay if I sign the address of this tx to get my account back?

I guess this would work if you could sign a message from that address you posted. It is pretty easy to sign a message if you are using Blockchain.com for it.

Quote

To sign a message, go to Settings > Addresses, and scroll down. Choose which address you want to sign, and click More Options > Sign Message. A small window will display allowing you to provide a unique message or signature that identifies you as the owner.

Source: https://support.blockchain.com/hc/en-us/articles/210353833-What-is-message-signing-and-how-can-I-do-that-

Based on this instruction, it is only possible to sign message from imported addresses. So, it's impossible to sign message from an address created by blockchain wallet.

To OP:

You should extract your seed phrase and import it into another wallet like Electrum. Then you can sign message from that address.
To do so, go to "security center". Scroll down and click on "back up" button. Blockchain wallet will give you a 12-word phrase.
Then install Electrum. Create a new wallet and select "I already have a seed" and enter that 12-word phrase.
In order to sign message using Electrum, click on tool at top of the window and then select "sign/verify message".

Note:
1. Download Electrum only from the official website. (https://electrum.org/)
2. Don't forget to check BIP39 when entering the phrase.
3. Select Legacy as your address type.