To make changes on your account we may ask you to sign a message using your Trezor wallet. This is a great way for us to verify your identity.
1. Log into your trezor.io wallet
2. Select the Sign & Verify tab
3. Fill in "Sign message" section. (we will "Verify message")
3a. Enter "node40" in the Message box.
3b. Enter one of your NODE40 hosted masternode public key in the Address box.
3c. Click the green sign button. Your Trezor will generate a Signature address.
4. Contact NODE40 with the Public Key and Signature address. firstname.lastname@example.org
Visit https://docs.dash.org/en/latest/wallets/signing.html for further details on Signing and Verifying Messages.