Quote from: navigatrix on June 18, 2016, 08:12:32 AM

Quote from: IITravel01 on June 14, 2016, 03:14:38 AM

Anyone want to help me figure out how to sign a message? Maybe I'm dumb, but I've spent an hour trying to figure this out on my blockchain wallet and can't. I've read this: https://www.reddit.com/r/Bitcoin/comments/18qy88/bitcoin_message_signing_and_verification/ without figuring it out.
I've found this: https://support.blockchain.com/hc/en-us/articles/210353833 which states:

"What is message signing, and how can I do that?

Message signing is a way you can prove you control a particular address, and demonstrate you have ownership of the funds.

This feature is currently only available for your Imported Addresses, but will be implemented for all addresses in the future. To sign a message, go to Manage Addresses to the right of Imported Addresses. Choose which address you want to sign, and click More Options -> Sign Message.

A small window will display allowing you to provide a unique message or signature that identifies you as the owner."

Now I didn't import an address for the transaction, so maybe that's why I'm not getting it?

Coinbase doesn't even let you do this. I chatted with them and it's not even possible since they mix the transaction before sending it out. Their recommendation was to 'transfer the funds to a wallet you control' first. AAAAaaaargh!

But with a lot of PMs, begging, links to the trx and screen shots, sidehack decided to trust me.

So if you're thinking about this and your spendable btc are in Coinbase, move them to a 'real' wallet

It is possible to sign a message in coinbase, but you have to find the address that was used for the transaction. I did test this a number of months ago and will test again to confirm it still works.