Every EDGE grade awarded by the TeachIn Academy board carries a unique ID. Type it here and this page says who holds it and what band it is — or says plainly that no such grade exists.
A grade a school can change is a reference, not a qualification. The board awards the grade against submitted evidence, the ID is issued with it, and it stays with the teacher when they move. A school reading a CV can check the claim here in a few seconds rather than taking it on trust.