Two words to add after your value proposition to validate it..

We spend a lot of time in SaaS working on honing our value proposition. They usually come out something like:

We help 'x' do 'y' to increase 'z'

One thing I've found really useful to do when practicing it out loud is to respond to myself with two words:

'prove it.'

If you can't, then it isn't a value prop. If you can't clearly articulate not just how you do it, but when you have, it's just a marketing tag line. You've not actually delivered value to anyone.

The reality is, that anyone you pitch it to or sees it on your marketing site will have those two words in the back of their mind too.