How to sign a message?!

[sho_road_warrior]

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[Sourgummies]

Code:

-----BEGIN BITCOIN SIGNED MESSAGE-----
This is Sourgummies from bitcointalk.org and today is 2015.09.22
and this is my test signature.
-----BEGIN SIGNATURE-----
12QykYQirkC6pwDfZuHv1CwR7qrJZ42t46
H5nI3fUNrx+MxjYlc2MkP1Y8MMplPNueMkW8lTQHpZGQf6OmUlmLgvUNdwqoOylSHf0jicUACMzMqfw39RGRL30=
-----END BITCOIN SIGNED MESSAGE-----

Is this right?

Finally figured out that firefox was not allowing me to do this and tried Safari.

[prodigy8]

Code:

-----BEGIN BITCOIN SIGNED MESSAGE-----
This is Sourgummies from bitcointalk.org and today is 2015.09.22
and this is my test signature.
-----BEGIN SIGNATURE-----
12QykYQirkC6pwDfZuHv1CwR7qrJZ42t46
H5nI3fUNrx+MxjYlc2MkP1Y8MMplPNueMkW8lTQHpZGQf6OmUlmLgvUNdwqoOylSHf0jicUACMzMqfw39RGRL30=
-----END BITCOIN SIGNED MESSAGE-----

Is this right?

Finally figured out that firefox was not allowing me to do this and tried Safari.

I just tried to verifiy in coinig and it seems that i does not verify it
http://coinig.com/?adr=12QykYQirkC6pwDfZuHv1CwR7qrJZ42t46&msg=This+is+Sourgummies+from+bitcointalk.org+and+today+is+2015.09.22%0D%0Aand+this+is+my+test+signature.&sig=H5nI3fUNrx%2BMxjYlc2MkP1Y8MMplPNueMkW8lTQHpZGQf6OmUlmLgvUNdwqoOylSHf0jicUACMzMqfw39RGRL30%3D
I will try now in brainwallet offline.
Edit: It works when i checked in brainwallet web archive and here it is
Message verified to be from 12QykYQirkC6pwDfZuHv1CwR7qrJZ42t46

[shorena]

Code:

-----BEGIN BITCOIN SIGNED MESSAGE-----
This is Sourgummies from bitcointalk.org and today is 2015.09.22
and this is my test signature.
-----BEGIN SIGNATURE-----
12QykYQirkC6pwDfZuHv1CwR7qrJZ42t46
H5nI3fUNrx+MxjYlc2MkP1Y8MMplPNueMkW8lTQHpZGQf6OmUlmLgvUNdwqoOylSHf0jicUACMzMqfw39RGRL30=
-----END BITCOIN SIGNED MESSAGE-----

Is this right?

Finally figured out that firefox was not allowing me to do this and tried Safari.

I just tried to verifiy in coinig and it seems that i does not verify it
http://coinig.com/?adr=12QykYQirkC6pwDfZuHv1CwR7qrJZ42t46&msg=This+is+Sourgummies+from+bitcointalk.org+and+today+is+2015.09.22%0D%0Aand+this+is+my+test+signature.&sig=H5nI3fUNrx%2BMxjYlc2MkP1Y8MMplPNueMkW8lTQHpZGQf6OmUlmLgvUNdwqoOylSHf0jicUACMzMqfw39RGRL30%3D
I will try now in brainwallet offline.
Edit: It works when i checked in brainwallet web archive and here it is
Message verified to be from 12QykYQirkC6pwDfZuHv1CwR7qrJZ42t46

Coinig is bugged, see the OP. It does not verify multi line signatures and should not be used because the devs are unable to contact can not be reached and we dont know what other errors there might be.

Blocktrail -> https://www.blocktrail.com/BTC?verifysignedmessage=1
and core (below) verify it just fine.

[Sourgummies]

Really appreciate the quick responses and the detailed thread,this really should be sticky for us newbies.

[prodigy8]

@shorena i just checked my coinbase account and it seems that i can not sign a multi line message? Is that problem only to me or to all?

I will not use anymore the coinig to verify the signed messages, the new website blocktrail seems a good platform.

Really appreciate the quick responses and the detailed thread,this really should be sticky for us newbies.

You are welcome, we are here to help the community.

[shorena]

@shorena i just checked my coinbase account and it seems that i can not sign a multi line message? Is that problem only to me or to all?
-snip-

Works for me, might be a browser issue? I tested it with chrome latest and it worked.

Really appreciate the quick responses and the detailed thread,this really should be sticky for us newbies.

Glad you like it. Its linked in the unofficial rules sticky, I try to bump it on a regular basis and a few other member have the link here bookmarked. Should be enough

[EthanB]

Thank you for this thread, I had no idea how to sign/verify a message before right now and I'm positice it will come in handy in the near future.

[zenitzz]

thank you for this guide it was really helpful, now i know how to sign message to prove ownership

[Ceizer54]

Thanks so much sir for explaining in detail how can i sign a message...I was wondering since long time what does signing a message means..it clears a lot of douts of mine..Still how can we verify that the message signed is actually correct? 

[rz20]

Thanks so much sir for explaining in detail how can i sign a message...I was wondering since long time what does signing a message means..it clears a lot of douts of mine..Still how can we verify that the message signed is actually correct? 

I think the easier wallet that offer this is old multibit. You can verify or write a message from the options menu.

[shorena]

Thanks so much sir for explaining in detail how can i sign a message...I was wondering since long time what does signing a message means..it clears a lot of douts of mine..Still how can we verify that the message signed is actually correct? 

See the verify section -> https://bitcointalk.org/index.php?topic=990345.0#post_verify

It currently lists online services because they are easily available even if you dont have access to your wallet. I plan to add verify guides for wallets over time as well.

[phishead]

Is it possible to sign a message with breadwallet or any other open source wallets like blocktrail or something like that?  I'd prefer to sign a message of mine that has the convenience of not having to download anything on my computer... but then again, I might need too in the long run if I plan on keeping my bitcoins safe... help

[shorena]

Is it possible to sign a message with breadwallet or any other open source wallets like blocktrail or something like that?  I'd prefer to sign a message of mine that has the convenience of not having to download anything on my computer... but then again, I might need too in the long run if I plan on keeping my bitcoins safe... help

Breadwallet (at least the iOS version) does not allow signing and according to this[1] post blocktrail does allow signing either. I did not have the time to test blocktrail myself though so the info might be outdated. Since its only 14 days I doubt that though.

[1] https://bitcointalk.org/index.php?topic=1180096.msg12416551#msg12416551

[socks435]

Sir how about if i want to buy account with sign message how to do?

[Decoded]

Sir how about if i want to buy account with sign message how to do?

if you are about to buy an account here with signed message ofc, the one who is responsible to provide it is the seller so you only have to ask for it

[DaddyMonsi]

Sir how about if i want to buy account with sign message how to do?

if you are about to buy an account here with signed message ofc, the one who is responsible to provide it is the seller so you only have to ask for it

Ask the Escrow to help you verify the message if you are not yet familiar with signing a message. Don't buy with out an escrow!

[chanlance]

LEARNT MORE THAN I BARGAINED FOR

[shorena]

Sir how about if i want to buy account with sign message how to do?

My suggestion would be to use escrow. Most sellers will not tell you the exact name of the account in advance. Thus the escrow would have to check for the oldest available address of the account and request a signed message for you.

Like I have linked an old post in my 1st post here. The address posted in Dec 2013 is still under my control. If I wanted to sell my account I could sign a message with this address saying that I freely sold it to you. That way you can proof that I indeed sold the account to you and you are now the rightful owner of the account. You dont have to reveal this signed message unless you need to. As long as nobody questions whether you are the rightful owner of the account shorena you can keep the signed message somewhere safe. Requesting a signed message should be normal for a good escrow service, but it might not always be possible.

Not everyone posted their address in the past. If there is no old address you can still request a message signed with the payment address. E.g. you buy my account and I want the payment on address 1sho... I could sign a message with 1sho... stating that I just sold the account shorena to you.

Once you have control over an account you should stake one of your addresses in this thread by tomatocage -> https://bitcointalk.org/index.php?topic=996318.0

This enables you to sign a message in the future should you want to sell the account or if there are other issues where you need to convince someone that you are the rightful owner.

[syndria]

-----BEGIN BITCOIN SIGNED MESSAGE-----
Im syndria owner of this address today is October,03,2015
-----BEGIN SIGNATURE-----
17FWb5uqJRP5EkPDjwBzcMQAecHi36Jv1D
IB2RRGYJ9frwm2tKxbVpz1P+crqguOIHfsytFTmos8xuGh/rL0glgm1vYX9DsDhP8fJozT/VyVRRKC4zMRKfwck=
-----END BITCOIN SIGNED MESSAGE-----

Please Quote and verify thank you for your help