Yes. There are wallets that support Mac operating system that you can use to sign a message. But, I will recommend you to use electrum wallet. You can download it on your Mac computer. Do not use third party site to download it. Visit the official electrum wallet site for the download, you can easily download it from there and also check the signature. Use below link for the download.

https://electrum.org/#download).

Thank you! I will try and share feedback with you here soon! 

Quote and verify the message for you with Electrum wallet. Congratulations! After 9 months, you are able to sign a correct Bitcoin message.

You make me confusing. Why do I need to use online tool to verify a bitcoin signed message?

Electrum is a non-custodial wallet and I have full control on my wallet. It allows me to sign and verify bitcoin message.

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I verified it like this:

Message

Address

Signature

Yes, I verified it again and I did verified it with my Electrum.

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The online tool you used is bitcoin.com. It is a site of Bitcoin Cash. It is a trash, OMG

So in order words my signature is okay?

Okay, thanks a lot
At least I have learnt something new and that is how to sign a message with a bitcoin address.
I promise to contribute to the forum in any way I can thank you.

I hope that you did not give your private key from the another person. If you did give it up, you should not use that address because that person can be able to steal your bitcoin.

If the inputs are correct, you can verify your sign message on your computer, on the same wallet, or on other devices and other wallets. Everyone can verify a signed message if inputs are correct (no typo).

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Typo is not restricted to typo.

If you add or cut space, make line breaks when you verify a message, you will not verify it because the input is different than what owner used to sign that message.

With the same address you use to sign, if you input different message like these (in the Message area), you will get different Signatures.

I'm glad you finally got it right, but "signed message" doesn't include your username and could just be some signed message example you got off the internet somewhere...

You're welcome.