How to sign a message using blockchain.info:
- Log into blockchain.info
- Click on receive money
   - click on the actions button to the right of the address your using for labrat
   - click on sign message
      - enter email body as detailed in the post/s above
   - click sign message
   - copy "signature" output
Close "Sign Message" window

Using the message and signature, you can create a new email which you can send to labrat - this process proves that you have control of the BTC address.


How to VERIFY your message:
- Log into blockchain.info
- Click on receive money
   - Click on "More Actions" (bottom right - below the Balance)
   - Verify Message
   - Enter details
   - Click Verify - you should get a green "Message Successfully Verified" notice
Close "Verify Message" window

- Log out of blockchain.info if you are finished