I'm doing it step by step and and doesn't work.. It always show "invalid signature" message..
what's the problem ? I'm trying to sign on every network but it's the same :s
any idea ?
Did you get it working yet?
While you are connected to the Kovan test network in MetaMask and you have MetaMask unlocked, you need to sign the message (
https://www.mycrypto.com/signmsg.html ) by selecting 'MetaMask / Mist' on that page (so NOT the keystore/json file or you will get different output)... you will then get a MetaMask popup. This should work if you have DAY and some KETH in your wallet address.