How to sign a message?!

[kissmarx]

Hi! I am using coins.ph . How can I sign a message using it?

Well i think it's not possible to do that, you basically do not own your private key and coins.ph it's just an exchange wallet.
Better sign a message using address that you hold/provide the private key as well.

Okay. Thank you for your reply.
I didn't have idea before that I cannot sign messages when using coins.ph.
I guess I have to use something like an app from blockchain wallet? Is it possible with that?

No , you can't find and signed message in app. Open it in a browser ,you can also sign a message with other wallets not only blockchain . Coins.ph doesn't support any signed message feature .Read the OP post in the firet page and follow the steps .

Thank you for your answer mate
Please excuse my noobness regarding this matter.
So when you say you can't find and sign a message it an app, you also mean to say that, like for example, in EXODUS wallet we cannot also sign messages?

[1713515426]

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[wumBowo]

No , you can't find and signed message in app. Open it in a browser ,you can also sign a message with other wallets not only blockchain . Coins.ph doesn't support any signed message feature .Read the OP post in the firet page and follow the steps .

Thank you for your answer mate
Please excuse my noobness regarding this matter.
So when you say you can't find and sign a message it an app, you also mean to say that, like for example, in EXODUS wallet we cannot also sign messages?

i assume you are using a mobile phone and rely an apps for keeping your bitcoin.
if so then u might use mycelium apps . the steps already on the first page , just type mycelium there.
You still can use coins.ph as ur hot wallet (for daily transaction) and use mycelium only for making a signature. So if something happened to you such as your account got hijacked, you can prove you're the rightful owner and the account will back to you.

use this thread https://bitcointalk.org/index.php?topic=996318.0 to post your signature and wait someone to quote your signature and verify it,
you can use it as a prove later.

[shorena]

-----BEGIN BITCOIN SIGNED MESSAGE-----
i 'm prince. 29.07.2017
-----BEGIN SIGNATURE-----
1PRinCeXWg6vJgyZCNnsB5CJfU8hpmUKVy
HE7CRLP3FexWDMxHRw9q33s+fbCdBA7MDaSl4Y6or6f5FmCcUPwu4hcP5jzI7LKaaP7EaPkgoTRNfl05JeUiBt8=
-----END BITCOIN SIGNED MESSAGE-----

Verifies just fine.

[maeusi]

Many thanks for your great tutorial. Coinomi also has the feature now, but I get an error. Maybe I must debug coinomi or similar. I wrote coinomi but haven't an answer right now. Before I do something wrong, I wait better for an advice of an experienced member here.
I think, that I need first to get somehow the private key on coinomi with backup, before I can generate a signature.

[shorena]

Great tutorial, very helpful for newbies who I have seen having trouble understanding the difference between signing a message and signing a post.

I dont know what 'signing a post' means, so it probably just means to post something with a signed message?

Can you make one for 'How to get a PGP Key', as well?

No. This came up often in the past, but there are good PGP tutorials and creating another one would be redudant.

[ezonlinebiz]

Any instructions on how to sign a message for coinpot ? 

[lorisrossi]

I would like to verify messages using a script, not by hand.
For what I've seen, I could do that by downloading the full blockchain, and then I can use bitcoin-cli API ( this command ).

If I can't download the full blockchain, is there any other way to do that? Maybe an API service like https://blockchain.info/api or https://blockexplorer.com/api-ref

Chain Query is really close to what I'm looking for, but I need to send requests from a script

[shorena]

I would like to verify messages using a script, not by hand.
For what I've seen, I could do that by downloading the full blockchain, and then I can use bitcoin-cli API ( this command ).

If I can't download the full blockchain, is there any other way to do that? Maybe an API service like https://blockchain.info/api or https://blockexplorer.com/api-ref

Chain Query is really close to what I'm looking for, but I need to send requests from a script

You dont need the full blockchain in order to verify a message, you can point the client at a false IP and keep it unsynced. I mostly use scripting vs. a local node[1], but a remote API can also work, e.g. blocktrail's[2] has a verify message call.

[1] https://en.bitcoin.it/wiki/API_reference_(JSON-RPC)
[2] https://www.blocktrail.com/api/docs

[lorisrossi]

You dont need the full blockchain in order to verify a message, you can point the client at a false IP and keep it unsynced. I mostly use scripting vs. a local node[1], but a remote API can also work, e.g. blocktrail's[2] has a verify message call.

[1] https://en.bitcoin.it/wiki/API_reference_(JSON-RPC)
[2] https://www.blocktrail.com/api/docs

Blocktrail's API suits my needs, thanks for your help!

Cheers

[JanpriX]

I just stumbled upon this tutorial and would like to thank the OP for creating this thread. I've been seeing those signed messages  in this forum and wondered before on how to do it. Will definitely put this on my watchlist as this will become very handy in the future.

[emsy37]

I read your post several times and this is what I learned.  I hope I get it right. Please verify.  Thanks.

-----BEGIN BITCOIN SIGNED MESSAGE-----
This is emsy37 from bitcointalk.org and today is 08/09/27 10:59:51 am. I made this signed message to send my thanks to Shorena for a wonderful signed message tutorial. It will benefit many newbies.
-----BEGIN SIGNATURE-----
171zFe6Atv1F4TTPiZgCL5wzagKFVZwKzX
IGgiFr0pdsQl8ZZdSiipxfVWjIAoXIX/RqNIFphwKL9fLotnJTTMkEAOA5r+26LJLd9pLAH6OzqPrsnbkxTjWJs=
-----END BITCOIN SIGNED MESSAGE-----

[shorena]

I read your post several times and this is what I learned.  I hope I get it right. Please verify.  Thanks.

-----BEGIN BITCOIN SIGNED MESSAGE-----
This is emsy37 from bitcointalk.org and today is 08/09/27 10:59:51 am. I made this signed message to send my thanks to Shorena for a wonderful signed message tutorial. It will benefit many newbies.
-----BEGIN SIGNATURE-----
171zFe6Atv1F4TTPiZgCL5wzagKFVZwKzX
IGgiFr0pdsQl8ZZdSiipxfVWjIAoXIX/RqNIFphwKL9fLotnJTTMkEAOA5r+26LJLd9pLAH6OzqPrsnbkxTjWJs=
-----END BITCOIN SIGNED MESSAGE-----

Sorry, but I couldnt verify this.

[emsy37]

I read your post several times and this is what I learned.  I hope I get it right. Please verify.  Thanks.

-----BEGIN BITCOIN SIGNED MESSAGE-----
This is emsy37 from bitcointalk.org and today is 08/09/27 10:59:51 am. I made this signed message to send my thanks to Shorena for a wonderful signed message tutorial. It will benefit many newbies.
-----BEGIN SIGNATURE-----
171zFe6Atv1F4TTPiZgCL5wzagKFVZwKzX
IGgiFr0pdsQl8ZZdSiipxfVWjIAoXIX/RqNIFphwKL9fLotnJTTMkEAOA5r+26LJLd9pLAH6OzqPrsnbkxTjWJs=
-----END BITCOIN SIGNED MESSAGE-----

Sorry, but I couldnt verify this.

Oh my! What seems to be the problem.  I think it over. I will try again.

[Considered]

Thank you shorena i now understand how to sign a message and tested it myself using http://coinig.com/

[aizen10]

Thanks for this very informative thread created by shorena. ive learn a lots on this thread and i decide to download a electrum wallet instead of my own wallet that has no features to create sign message, to try if i learn how to create my very first sign message from electrum, and i made it, ive done because of your amazing tutorials. and here it is > https://bitcointalk.org/index.php?topic=996318.msg20817716#msg20817716 now im just waiting to qoute and verify my sign message.

Thanks a alot OP and to the other who still updating the other informations about the updates of the other wallets . 

[xamil]

great! so thankful here that I opened your post and it helps me a lot as a newbie. two thumbs up for you sir shorena. hope i understand more here in bitcoin.

[senturion]

Just has stumbled upon this thread, thx a lot for your time on adding it / creating pics.

[chrisst]

I have not confused it
Address:
1DADerDP2D9bpDmaBoJzaniKTVCTRratft

Message is :
Hi this is BitcoinSupremo in her first test to sign a
message. Hope I have done it right.
Its been done using Multibit Classic.

[shorena]

I have not confused it
Address:
1DADerDP2D9bpDmaBoJzaniKTVCTRratft

Message is :
Hi this is BitcoinSupremo in her first test to sign a
message. Hope I have done it right.
Its been done using Multibit Classic.

Its missing the signature though.

[LTU_btc]

Did Coinbase removed function to sign a message or I can't find it? Link to Coinbase article about signing message on this tutorial doesn't exist anymore