About decentralization A blockchain is just a blob of data. What matters is how you maintain that blob of data, and how you are using it. So if you are going to compare bitcoin to a centralised server, like Visa, bitcoin has a couple of advantages from an integrity point of view.Everyone can verify the transactions. There is not this black box called PayPal that you have to trust. There is no way for you to know what transactions have been going on in the backend, whereas everything is out in the open with bitcoin