Just so you know, a couple of years ago one of our leading PC mags tested various materials to cast a fake finger - and they succeeded.
Also, should you suddenly pass away, those left behind would have much easier time canceling all your accounts if all your passwords were in a notebook. Even better if the passwords had a creating/changing date added. Of course they could also cut your finger off the corpse, preferably after embalming so the finger won't rot before the job's done.
