[Cryptography] Need a better name

[Phillip Hallam-Baker]

​We all know about using a digest to create a unique fingerprint for a
static file.:

Fingerprint = Presentation ( SHA-2-512 ( fred.txt ) )

I find it is useful to distinguish the presentation of the digest value
from the digest value itself and fingerprint is as good as anything for
that.

But what if the file isn't static? Well the obvious approach is to use a
public key signature in some way. In the Mesh, I use this to authenticate
profiles as follows:

1) Each profile has a unique signature key.

2) The unique identifier of the profile is the fingerprint of the public key

There are some other features I might add in the future such as
checkpointing against a linked log but that is the basic concept.

Problem is, what to call it?
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