The passhrase below was used as a Brainwallet to generate the given address.
Address is based on a non-compressed private key.
You can check the private key is indeed known by verifying the following signed message when running your own node:
Alternatively you can use this link to verify the message online. Values needed:
By using a weak brainwallet the private key for address 1MGdWtLZ4Gd1C4EQEWvspTo9v4bdvUwstC has been compromised.