In this project, we would like to combine blockchain and other current technologies to build a peer-to-peer digital data delivery platform. All data delivered is confidential except the specified recipients. Data is verified to be unchanged down to every single bit. Operations on the data are properly done and recorded among the peers so that the delivery histories are public verifiable yet unforgeable. Peers are rewarded by delivering the digital data and helping to run the platform with good will. This platform also works as a decentralized document certification and circulation system. It allows users to issue documents under their email / name and send to other like certificates. Authorized people can “sign” a data (e.g. contract) from others and cannot deny it afterwards. The protection can be readily extended to even the physical copies, with our award-winning document authentication technology.