A name was changed, a company misspelled, addresses changed incorrectly can all put a damper on your day.
Fortunately, we have a quick and easy solution to such a conundrum!
Turn on “Log Changes to History” for a field. This setting is universal (affects all users and all contacts) so you’ll need master rights to do this.
On the field you want to turn logging on for Right-Click and select Properties on the field label.
Then select the Security tab and check Log changes in history.
Now, whenever changes are made to the field the user making the change, the date, the old value, and the new value will be logged on the history tab.

Double-Click on the entry to Zoom in on the details…
PS This can be turned on for any Top Half (Except Email & Website) or Custom Field (Fields Tab).
PPS Screen shots are all from GoldMine Premium Edition but the functionality has been in GoldMine for years.