The paper summarizes a treasury system as: "a community-controlled and decentralized collaborative decision-making mechanism for sustainable funding of blockchain development and maintenance. During each treasury period, project proposals are submitted, discussed, and voted for; top-ranked projects are funded from the treasury".
In the paper, the researchers modelled, designed, and implemented a provably secure treasury system that is compatible with most blockchain infrastructures such as Bitcoin, Ethereum, and of course, Cardano. The core component of the system is a secure and efficient voting protocol. The researchers claim that the integrity of treasury voting decisions is guaranteed even when all the voting members are corrupted. To improve the protocol's efficiency, the paper also proposes the world's first honest verifier zero-knowledge proof for unit vector encryption with logarithmic size communication, whatever that means.