Verification of the signature always false

[AlessioPalmieriIT]

I have updated the key list with the latest available, but in the console the result of "isValid" is always false with any green pass entered.

Are other operations necessary to make everything work?

[jumpjack]

I don't understand how to verify the signature, I studied it for a month without success, hence the verification result is only visible in console, for debugging and testing.