**3. EconLedger: Rationale and Architecture**

This section provides a comprehensive overview of EconLedger system architecture consisting of the following: (1) upper-level IoVT application layer; and (2) Econledger fabric enabled security networking infrastructure. Following that, we explain the network model of EconLedger with basic security assumptions and describe an efficient hybrid on-chain and off-chain storage structure based on the DDB system.
