What is a Bitzi Bitprint?

If there is any change at all, no matter how slight, the two files will have completely different bitprints. (Changing a file's name on disk, since it does not alter the contents of the file itself, does not change a file's bitprint.)

Bitprints are based on a standard tool of computer/information science called "cryptographic hashes." While it is theoretically possible that two files would have the same "hash value," finding two such files – intentionally or accidentally – is considered so hard as to be practically impossible: it would take millions of years of searching.

A bitprint can thus serve as a file's "true name." If two people who have never met possess two files, and those two files render the same bitprint, each person can be confident they have the exact same file as the other, without actually doing a full-comparison.