When the client reports its CPID to the server,
the server hashes it with the email address;
the hashed version is what's stored in the DB and exported.

(This bit of paranoia prevents hackers from introducing
duplicate host CPIDs into the DB)

Oliver Bock wrote:

> As I want to pass a unique host identifier to our science app, I also looked 
> at HOST_INFO's member "host_cpid". However, for some reason the value of this 
> member on my host (in init_data.xml) differs from its respective (single) 
> host 
> table entry in our project database. How can this happen? I thought that this 
> ID is created only once per host and doesn't change, or is at least 
> consistent 
> with its database entry. Can "host_cpid" be used as a unique host identifier 
> at all - at least for a given project (doesn't need to be unique across 
> projects)?
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