Yeah. Right now, it is largely based on trust. We're hoping to implement some kind of one-time "seal" and new token that a user can verify after receiving a bill to ensure that someone else can't activate it with a picture or by saving the token. That obviously comes with the downside of making it more difficult to transfer.

As a proof of concept, and being based on Venmo, I think it is and will be largely based on user trust as long as the bill creator keeps the funds (Venmo allows no bot accounts).