Brainwallet is now Closed Permanently[1,2] and thus there is currently no way to verify a signed message with having a client or using a service that requires a login. At least to my knowledge. If you know about a site that is able to verify signatures please let me know. For more about why the site is down see these[3] defcon slides or wait for the speech to be available as video. The tl;dr is: brainwallets are bad if done wrong and most do it wrong. My assumption currently is that this is the reason the site is down, which sadly also takes down the features that can be used without risk.

As Im currently not at home it will take some time till more verify guides are available.

[1] https://brainwallet.org/
[2] https://twitter.com/brainwallet/status/629759260004630528
[3] https://rya.nc/cracking_cryptocurrency_brainwallets.pdf

Awesome, will add it ASAP.

I have tried it twice and success

https://bt.irlbtc.com/view/996318.msg12083790#msg12083790
https://bt.irlbtc.com/view/996318.msg12083800#msg12083800

I vote for this to be stickied here and in the lending section.

Do you know how to contact the devs? Its jackjack's lib, but there seems to be something wrong. This is what happened when I tried to make the picture just now.



Edit:

Contacted chainquery as they have thread here: https://bt.irlbtc.com/view/1115048.msg12097893#msg12097893

I have contacted jackjack and also I am looking for the developer of coinig.


You can't.

Thanks.


Correct, this is true for all multi sig addresses or services that use multi sig. The problem is that there is no standard how a signature would be done with more than one key[1].


You dont have to use the same wallet for signing as you use for spending. You can create a wallet just for signing messages.

[1] https://www.reddit.com/r/Bitcoin/comments/2k3t9c/can_i_sign_a_message_using_greenaddress/clhmbq2

windpath the dev behind Chainquery is very responsive though[1]. Im very positive they will get it fixed soon. The site might be a bit overwhelming, but I planed to add the major clients anyway. This will be a good motivation to do so.

Edit: Its fixed now, I added a link and will make the pictures soon.

[1] https://bt.irlbtc.com/view/1115048.msg12098376#msg12098376

thanks.

Have added pictures for chain query[1,2] now.


[1] https://bt.irlbtc.com/view/990345.msg10775516#post_chainquery
[2] http://chainquery.com/bitcoin-api/verifymessage