# A Blockchain Solution for Remote Sensing Data Management Model
## 3 The Architecture of the System
### Architecture of Remote Sensing Data Sharing Model Based on a Multi-Level Blockchain
Specifically, the Remote Sensing Open Data Chain (hereinafter referred to as RSOC), provides a content-based search for the public, and provides remote sensing products produced in the remote sensing alliance chain, such as flood monitoring maps, to the public, and the public provides open data based on incentive mechanisms, and accesses data based on smart contracts. The Remote Sensing Industry Consortium Chain (hereinafter referred to as RSIC) is built on the basis of the public chain. The verified and game-tested remote sensing trust services are situated on the basic public chain, and each alliance chain is built on the basic public chain. There may be some private data and private deployment on the alliance chain, while there are open data on the public chain, and the data are mainly used for deposition and basic trust services. The problem of trustworthy data interaction between different agency nodes and between the general public and remote sensing agencies must be considered when designing a multi-chain structure combining public and coalition chains. The specific idea is that the alliance chain combines related remote sensing data centers according to remote sensing applications, shares remote sensing raw data among the chains, and realizes the shared alliance among different remote sensing industry institutions, and nodes on the same chain maintain the same data, thus promoting the collaborative development of upstream and downstream users in the remote sensing industry chain. All organizations among the alliance chains share remote sensing metadata and transaction data, as well as consensus protocols and smart contracts, but do not share raw data between chains, in order to protect data privacy. Each alliance chain ensures the integrity and traceability of a remote sensing industry chain, and the alliance chains interact with each other through public chains. Figure 2: Multi-chain structure blockchain architecture (own elaboration). Each chain consists of different nodes, and the nodes on the same chain maintain the same data, while the nodes on different chains maintain different data, so that the data on different chains are isolated from each other. At the same time, the nodes in the system can join different chains, according to their own working needs, and then, that node will only synchronize the data on the relevant chain. Such a storage method can reduce, to a greater extent, the number of data that nodes in the system need to synchronize and store, shorten the time consumption required for data synchronization, and reduce the storage space required for data storage. The data on different federated chains are isolated from each other, which can realize the data concurrent operation of different chains, and improve the system concurrency. IPFS can assist different blockchain networks in transferring information and files. The multi-chain structure combining public chain and federated chain can break through the function and performance constraints of a single chain, and has a good performance of high concurrent transactions, while taking into account the isolation and protection of privacy data, to meet the diversified business needs in the remote sensing field.