Everything is in the ledger, just like the blockchain.
I've already went through this with another Ripple supporter
here:
Integrity of the total XRP count is equivalent to the integrity of the ledger, like the blockchain. Validation is performed by few parties today, and that is legit ongoing grounds for criticism. As the network grows, that will become less of a concern. Harming the integrity of the ledger is not in the interest of current Validators or Ripple Labs, as it damages the network. You can learn more about the Validator consensus process
here.
The integrity of Ripple is based on the assumption that nodes do not collude.
The problem with this is that as they say in all disclaimers: "past performance is no guarantee for future returns."
POW secured convergence of the ledger in Bitcoin is in contrast an objective proof of the will of the economic majority.