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The snapshot link will find a record or set of records. There are problems with securing the file because the user would have to log on or be auto admitted as a guest. You need to make sure that the snapshot captures the full and permanent network path of your server. There are also problems with these links in terms of their permanence.
Theoretically, though, I think it is possible. If it goes to a layout where the only visible field is the signature field which becomes active when you go to that layout. You could use layout-based script triggers.