That's actually is easily fixable. He changed the link to bank's website where copy of the contract's text located. So all "bank people" need to do is to check

That's actually is easily fixable. He changed the link to bank's website where copy of the contract's text located. So all "bank people" need to do is to check the link isn't altered. Or ad some other form of text sealing like "The text of this contract includes 2132 words, 4543 letters 'a' ..." and check for that seal only.