Currently there is no way on NXT for canvassers to receive a notification when a particular constituent record is modified. I see that there is an idea already for being alerted if a constituent is added to an event, but for major donors it would be very crutial to be alerted in a timely manner if anyone else in the organization has modified important constituents records, by adding new profession, actions, attendance to an event, adding a note, new gifts, etc.