Topic: How to sign a message?! - page 33. (Read 141318 times)

No.


The length does not matter, the private key can not be reversed from the public key. You would have to brute force it, which would take longer than our solar system will ever exist and requires more energy than our sun ever created.

I have a question about signed messages so please answer.

If the signable message is short and non random, then can somebody reverse-engineer my private key?

How long has a signed message be to be safe and not leak the private key?

A great and very detailed how-to for newbies in this forum. I suggest that this should be stickied for the users to see and notice it especially if they don't know how to sign a message. As always, a great post.

Thank you above you told me that its not the proper thread and since they already have quoted my post i didnt deleted it.

Btw your thread helped alot

I quoted it in the proper thread -> https://bitcointalksearch.org/topic/m.12592997

The message was signed by the specified address.
However, there is dedicated thread to stake your address https://bitcointalksearch.org/topic/stake-your-bitcoin-address-here-996318

you should post your signed message here instead https://bitcointalksearch.org/topic/stake-your-bitcoin-address-here-996318

-----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

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://bitcointalksearch.org/topic/stake-your-bitcoin-address-here-996318

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.

LEARNT MORE THAN I BARGAINED FOR

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!

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

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

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://bitcointalksearch.org/topic/m.12416551

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

See the verify section -> https://bitcointalksearch.org/topic/how-to-sign-a-message-990345

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.

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

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? 

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