"I would be very satisfied with a service that marketed itself simply as:
(1) Being able to tell with 100% certainty that the card had not been altered in any way;"
I don't think that is realistic. While obvious alterations are easy to detect, sophisticated ones are not, and my own view is that the grading services don't have the time or the technology to unmask them all. They are not FBI crime labs, and there are people out there who are VERY good at what they do.
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Net 54-- the discussion board where people resent discussions. 
My avatar is a sketch by my son who is an art school graduate. Some of his sketches and paintings are at
https://www.jamesspaethartwork.com/
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