How to add Signature

Coinomi Wallet

1. Go to DigiByte Account
2. Click 3 dots
3. Select sign/verify message
4. Enter address and message
5. Click sign

Core(addresses starting with D only):

1. File -> Sign message
2. Enter address
3. Enter message
4. Click Sign Message

Core Wallet

1. Help -> Debug window -> Console
2. walletpassphrase "YOUR_PASSWORD_SKIP_THIS_LINE_IF_NONE" 120
3. dumpprivkey YOUR_ADDRESS
4. signmessagewithprivkey KEY_FROM_ABOVE "THE_MESSAGE"