Proof of Delivery in a Trustless Network

We propose a novel proof of delivery (PoD) mechanism to incentivize peers to participate in peer-to-peer content delivery services in a secure and effective fashion. By analyzing transaction records on a blockchain, the PoD can detect a fraudulent peer which does not pay for its content retrieval. Moreover, the PoD can enhance the delivery performance of a trustworthy peer by substantiating the notion of a trust window, whose size is proportional to the trustworthiness of a peer. That is, a trustworthy peer will experience enhanced delivery performance while a fraudulent one will be isolated from the network, which is checked by simulation results.