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Author Topic: How to sign a message?!  (Read 108786 times)
sHeRiLyN1618
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May 13, 2017, 02:29:28 AM
 #461

How can I sign a message in the new blockchain?It seems I can't find a sign button there,I've only seen the verify one.It's not in the manage options.
By blockchain I assume you are referring to blockchain.info

To sign a message, go to the "Settings" tab on left, Click on "Addresses", Click on "More Options" in front of your required address, Choose "Sign Message" .

Does the new version allow signing messages? My last info is only the old wallet version does.
Yes it does allow signing.
I don't use blockchain.info much, but the steps above do work for latest version too ! I checked yesterday only.
It's here :
You may update the OP  Smiley


I believe it will only work for the imported addresses, try to make new address and sign a message with it!
If you make a new address in the new blockchain also do not work for sign message. It actually work for imported address. I do not know why the blockchain make this not available to sign message there with new address.
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May 13, 2017, 03:13:28 AM
 #462

Thanks for this guide and information. I've been thinking and looking for this topic for a while now. What are these signed message that are so important? when trading or lending, etc in btc Now i know.. Sorry I am really a newbie in kind of these stuffs, There so many things that I don't know about bitcoin, I will learn more! Shocked

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May 13, 2017, 05:23:36 AM
 #463

-snip-
Yes it does allow signing.
I don't use blockchain.info much, but the steps above do work for latest version too ! I checked yesterday only.
It's here :
You may update the OP  Smiley

Done, thanks!

-snip-
I believe it will only work for the imported addresses, try to make new address and sign a message with it!
If you make a new address in the new blockchain also do not work for sign message. It actually work for imported address. I do not know why the blockchain make this not available to sign message there with new address.

Add this as well. Thanks!

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May 29, 2017, 03:00:28 AM
 #464

could i use pgp to sign a message usign my address as public key for the receiver..?

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May 30, 2017, 04:22:21 AM
 #465

could i use pgp to sign a message usign my address as public key for the receiver..?

No, Bitcoin Addresses (256 Bit) and PGP-Keys (usually 2048+ bit now) have different key-lengths.

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May 30, 2017, 01:55:30 PM
 #466

could i use pgp to sign a message usign my address as public key for the receiver..?

No, Bitcoin Addresses (256 Bit) and PGP-Keys (usually 2048+ bit now) have different key-lengths.
thanks, shorena, this thread is completely new stuff to me, i am learning this forum and if you have to guide me and us just make a post about your review of this forum, i found some very interesting segments and will text them soon
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May 30, 2017, 10:27:25 PM
 #467

could i use pgp to sign a message usign my address as public key for the receiver..?

No, Bitcoin Addresses (256 Bit) and PGP-Keys (usually 2048+ bit now) have different key-lengths.
thank you for your time, and your answer

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June 03, 2017, 07:07:13 PM
 #468

Thanks a lot  Kiss Kiss for this useful tutorial, actually I signed a message in order to post it on forum for the first time even though I did sign a few in web wallets but I learned the forum format from this thread, here you can check it out.
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June 05, 2017, 07:43:48 PM
 #469

How can you sign a message if you have the BTC address (uncompressed public) and the private key (starting with '5') without importing the private key in a wallet (is software available)?

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June 06, 2017, 02:47:20 PM
 #470

Does anybody know how to sign a message from an old wallet.Because apparently I can't do it on blockchain.info as I have to import an address and this is taking too long for now.The other wallets I can sign from a new wallet but how I do it from an old one-for example the one in my blockhain.info account

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June 10, 2017, 01:04:29 PM
 #471

First of all, thank for the post, I really had no idea on how to go about this. Especially as the interface on blockchain.info changed into the new one.
Found it much easier to do after reading this thread.
Thanks!
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June 12, 2017, 05:19:55 AM
 #472

How can you sign a message if you have the BTC address (uncompressed public) and the private key (starting with '5') without importing the private key in a wallet (is software available)?

IIRC there are webpages that allow this, but I didnt like them because they could easily steal your private key. Other than that, electrum is software that can help you here, you just have to create a wallet with that specific private key. If thats to close to 'importing' for you, I dont know anything else.

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June 12, 2017, 11:35:21 AM
 #473

First of all, thank for the post, I really had no idea on how to go about this. Especially as the interface on blockchain.info changed into the new one.
Found it much easier to do after reading this thread.
Thanks!
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June 12, 2017, 10:12:22 PM
 #474

How can you sign a message if you have the BTC address (uncompressed public) and the private key (starting with '5') without importing the private key in a wallet (is software available)?

IIRC there are webpages that allow this, but I didnt like them because they could easily steal your private key. Other than that, electrum is software that can help you here, you just have to create a wallet with that specific private key. If thats to close to 'importing' for you, I dont know anything else.

As a follow up: Electrum does not support private keys starting with '5' (the 'L' variant is still supported). In the end, I indeed did this via a webpage, but running locally in a Virtual Machine without networking and deleting everything afterwards

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June 13, 2017, 07:11:23 AM
 #475

How can you sign a message if you have the BTC address (uncompressed public) and the private key (starting with '5') without importing the private key in a wallet (is software available)?

IIRC there are webpages that allow this, but I didnt like them because they could easily steal your private key. Other than that, electrum is software that can help you here, you just have to create a wallet with that specific private key. If thats to close to 'importing' for you, I dont know anything else.

As a follow up: Electrum does not support private keys starting with '5' (the 'L' variant is still supported). In the end, I indeed did this via a webpage, but running locally in a Virtual Machine without networking and deleting everything afterwards

Cant confirm.

Code:
-----BEGIN BITCOIN SIGNED MESSAGE-----
I cant confirm that electrum no longer allows importing uncompressed keys. This message was signed using electrum 2.8.3 and the private key: 5JD1YosAJVHEtiks6x7xq8rhjHaBPMrxr3xYUVpj2uQF7mbb4RQ
shorena 2017/06/13
-----BEGIN SIGNATURE-----
1PWirAw5ZBQLBHNpsRPdw1HQRWmMHyCheG
HGSo45uowZk8CA9Gm9aWefEb3Cv7N3WN1oL7lBp26jTSAG5IEEwGfmD/gXTqumoMH5/qDQPyZFUT6TLCoxQVfvU=
-----END BITCOIN SIGNED MESSAGE-----


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June 13, 2017, 09:58:46 AM
 #476

I cannot import a wallet address in the latest Electrum with a '5' private key. Importing an 'L' private key does work.

[edit]
Strangely, I am able to import the '5' key you used as an example. I need to check this further.

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June 13, 2017, 10:03:31 AM
 #477

I cannot import a wallet address in the latest Electrum with a '5' private key. Importing an 'L' private key does work.

I understand that, but I just did it so it might be something on your end not with the wallet. Maybe ask in the electrum section about the specifics.

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June 14, 2017, 01:00:28 PM
 #478

Thank you this is very informative!

It is unfortunate that blockchain.info does not offer signing messages from new address created in the wallet (only for imported addresses).. which does seem kinda strange..

POSTA - Photo Storage on the Blockchain: https://bitcointalk.org/index.php?topic=1944900.0
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June 22, 2017, 08:33:55 AM
 #479

First time to try sign a message.

I hope I make this right.

Code:
-----BEGIN BITCOIN SIGNED MESSAGE-----
Hi, this is jamyr of bitcointalk. signing this message today 6/22/2017 at 08:32 AM Forum time, to show gratitude for the tutorial shorena made.
-----BEGIN SIGNATURE-----
GyE6oo3ol1Ju+BhscqAPENZgx+AULM9qIVcB8LN77LXDcRvlDnVOe5K4IOuBhHXo+gOegYN2z6YgxxPRAIslcuU=
-----END BITCOIN SIGNED MESSAGE-----

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Muhammed Zakir
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I prefer Zakir over Muhammed when mentioning me!


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June 22, 2017, 11:03:58 AM
 #480

First time to try sign a message.

I hope I make this right.

Code:
-----BEGIN BITCOIN SIGNED MESSAGE-----
Hi, this is jamyr of bitcointalk. signing this message today 6/22/2017 at 08:32 AM Forum time, to show gratitude for the tutorial shorena made.
-----BEGIN SIGNATURE-----
GyE6oo3ol1Ju+BhscqAPENZgx+AULM9qIVcB8LN77LXDcRvlDnVOe5K4IOuBhHXo+gOegYN2z6YgxxPRAIslcuU=
-----END BITCOIN SIGNED MESSAGE-----

You need to post Bitcoin address used to sign your message.

Edit: Address used to sign above message is 1JAMYRoaPiqK4PStwMpKyWH3S5x6DvHRM. https://bitcointalk.org/index.php?topic=996318.msg19706342#msg19706342

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