Can PSA actually authenticate signatures without witnessing?

[Dyl]

I wrote a small piece about PSA’s signature authentication process.

The Giant Professional Grading Thread

You do not need photo evidence to receive an authentic grade for your signature. PSA/DNA relies on 50-100x magnification to determine whether a signature was printed or written (i.e., written ink will have strokes of different thickness where two lines crossed paths such as a “t”). They also have historical documentation of known autographs from the signer to compare each signature, including the styling of the writing and the pressure exerted. Part of this process can be seen in “real time” on …