So, how exactly does an online cashback service make us of blockchain and cryptocurrency??

I think nowadays most projects would benefit from blockchain....it's an excellent way to store data securely and transparently
in future blockchain will be in everything where it's possible, and it's great & more safe
I think in the future it could just happen the way store data securely and transparently. because increasingly the more developed benefits from blockchain.
it's true that more and more projects are based on blockchain, and those offered are also interesting.success is always for all of them