Bitcoin Forum

Verify bitcoin signatures use to be very simple:

http://brainwallet.org/#verify

I have just learned that this service is permanently closed  :(
Does anybody know of a good alternative?

Most bitcoin wallet can do this... but I am looking for an online service where you do not need to log in.

http://coinig.com/

I still personally prefer to use a wallet software over a website. You will need to trust the website owner enough to not change the code so that a message with an invalid signature does not display as being valid.

Since brainwallet is closed i use an archive to verify signed messages.
Here is a link http://web.archive.org/web/20150707020924/https://brainwallet.org/#verify
And it is still working well, about coinig it has some bugs sometimes.

Good point.

I completely agree on that. The online checker is good as a quick check, if you don't have access to your bitcoin-core.
If the message is really important, then should trusted software be used.

Further, I think the online checkers are important to have as a educational tool.



Thanks for the tip.

If you enjoyed brainwallet for signature checking, like I did, you can host a local version of the webpage. Suits me pretty well.

The command line tool bitsig supports signature verification:

http://bitcoin-gen.org/

For example:


$ bitsig random
$ bitsig signRaw "Hello"
$ bitsig verifyRaw "Hello" HGvuxnsAyWX0KP44mzqQvwTYVGoODuCtRZqyGBAvCQSrIfBZ8EtwqyCq/t8X0DuS9uqtLszskybkaE+OKUQit24=

$ bitsig signMultibit "Hello"

$ more C6E436F7.multibit
-----BEGIN BITCOIN SIGNED MESSAGE-----
Hello
-----BEGIN BITCOIN SIGNATURE-----
Version: Bitgen 0.7
Address: 17RjaCGZQbe2Cw984YdWcMcWDgM86kM7EN

GxcCeN159j8WoaRmMOUJY7WSpZlnOJPxVFG+9Psmwv4BeuCrt19O4qJfSlK9aLlVh1D1R8RjMkER+SuU57ZkESA=
-----END BITCOIN SIGNATURE-----

$ bitsig verifyMessage C6E436F7.multibit

Verifying Bitcoin signatures online is ludicrous to me. Why do we have wallets that we know are safe and will do the job?

This is like verifying SHA sums online, it beats every purpose of doing it!

Oh well..

I think wallets that function online can be very handy in certain situations where you don't have your main software availible, like you are traveling or something. It's good to have some spare change "in the cloud". Other than that, it's not safe. Brainwallet being closed is a proof of that.

But the point of verifying a message is only relying on your own trust of yourself to verifying the authenticity. If you use a 3rd party, you're again putting that trust into someone else's hand. Signing messages is a way to avoid that.

good job . very helpful . you can make a breakthrough.

There are many out there but a few can be trusted for amounts well over 100 bitcoins.

how long you use this service?
at bitcoin, we must have secure and reliable service

I have used that coinig before but it sometimes shows error for the  valid signature also. I prefer to use blockchain signature verification feature.

Use desktop wallet is easy way and secure way for verify, even you can sign message.

Well if you lazy to use desktop wallet to verify, i found a new site: https://mircoin.com/

That site looks very much promising.
But I wanted myself must be relying on my own desktop wallets rather than any online services.
What about old brain wallet users. If anyone who used a bitcoin address generated from there, and kept only address and no private key. Now the service is permanently closed how he will move out his bitcoins.

You are welcome, also i have found an online copy of brainwallet.
Which is still running and here is the website: http://wallet-2sx53n.sakurity.com/#verify
But if you can't access any then you can verify from desktop wallets.

You can also go to this website:

https://www.blocktrail.com/BTC?verifysignedmessage=1

Works as well!

Oh awesome, I needed this last week. Thanks, now I never need to start the QT again. :)

I think it is not so much ludicrous at least in the case that your account here in bitcointalk could be hacked by someone. See this thread of Theymos about the only possibility you have to recover your account. https://bitcointalk.org/index.php?topic=497545.0 (https://bitcointalk.org/index.php?topic=497545.0)

hmmm . right agreed with quickseller. A trusted and reputed site is recommended more.  :)

if you have an account in blockchain.info you can verify messages using that site as well, coinig sometimes cant verify messages, not sure why