Curious,  you say the fingerprint is unique to each machine.  But as far as I know there are only a few things truly unique to each machine and none of them should be available to js or a browser without actually hacking the machine.  Those would be the HD serial (in the case of windows machines it makes a unique serial upon formatting),  the machines network card mac address, and the gateway devices mac address.  None of these are available to js or a browser with only 1 exception,  java can access those.  

So im curious what else you consider as unique?  Obviously its not the email  or btc adderess because that ss you just showed has tons of accounts with the same fingerprint and the site doesnt allow duplicate btc or emails.  So its something else or wetsuit is abusing malware to access things he should not be.  I suppose the external ip could also be,  but i thought freebitco had measures against that already so making a fingerprint that uses the ip seems silly as it would then make better sense to simply use the ip for ease of human readability.  That to me would be like making another md5sum of an existing md5sum,  pointless heh.

 Another would be browser canvas fingerprinting but that is NOT unique to each machine and is an seo marketing tactic to group machines into similar categories to display targeted ads.  So a lot of machines would have the same fingerprint yet have nothing to do with each other other than the fact that they like similar things such as freebitco and other crypto places probably.  Its not a security method to identify specific machines.  Is he actually trying to use canvasing as a security measure?  I surely hope not or you will have ALOT more problems like you just had with this guy by falsely accusing his account.  Any security person would know you never use canvasing for anything other than marketing.  Sounds to me like wetsuit may need help in the security dept maybe.

I just tested my theory and it appears I am correct.  Different browsers on the same machine produced different fingerprints.  I think hes trying to use canvas printing incorrectly and thats really bad.  Alot of innocent people are going to get grouped into buckets with bad people and we have an example already.  The fingerprinting seems to be something new as far as logins go as it didnt exist for login requirements  until recently.  Now it requires the fingerprint id to login.  I dont like wetsuit at all,  but some friendly advice would be to stop attempting to use canvasing as a security measure.  Its going to fail more than its successful.