You may want to change your wallet and discard your seed since you seem to have entered it into so many online websites so far. When you do things like this, there is a chance that you leak your keys!
Because you input your seed phrase on incoleman already, if your first attempt was online and you have sent coins to the addresses of the seed phrase, I will advice you to send your coins to another wallet which you will newly create now. Do not trust anything online.
You made so many mistakes..... First, it sounds like you've entered your seed phrase on at least one website. You should NEVER do that! I can't emphasize enough how bad this is. You should take handling private keys much more serious. Second: signing a message on mobile is annoying.
It's just as if I knew that thing was going to get complicated and my security would be leaked or something, which is why I created a new address just to text the process of signing the message first. My old wallet is still secure because I did not use it to carry out this process.
Thanks for all the help. I appreciate
Third: why do you want to sign a message anyway? The address you're signing from is empty.
I want to sign the message with my old Bitcoin wallet to prove that it is still my own. This new wallet is empty because I just created it today.
Oh, and first: forget about your current wallet. Create a new one, move all your funds. Keep you old wallet, but mark it COMPROMISED and never use it again.
Although it's not yet compromised, I want to try the message on the below quote first, and if the result is not acceptable, then I will have to do something crazy that might lead to my security being leaked, and I will just have to do what you have instructed if it happens. thanks
I see no point in using iancoleman at all when there are wallets that support segwit address message signing. You can use Bluewallet instead.