Each high-level node can form a cross-chain on the boutique chain. Each DAPP is related to the side chain. Each partner on the high-level node can find a matching development model, that is, they can find the business he wants to develop and can derive their own individual contracts; the core code of the side chain is developed by node.js, but the UI can be Programming through any front-end technology such as QT, HTML, or JavaScript. Communication between the front end and the back end is usually implemented under the JSON RPC protocol. Developers or owners of DAPPs can track the usage of their applications. All cross-chain transactions in the DAPP are handled by the ‘master node’ of the side chain where the DAPP is located. Users of DAPPs must have a premium medical account, just like multi-signature accounts, whose main goal is to create a consensus for the new block and sign the main node of the DAPP, just like a multi-signature wallet. Once a new DAPP is created and signed on the master node, the SHA256 hash of the chunk needs to be calculated and submitted by its user as a DAPP chunk to the main blockchain of the premium healthcare chain. When the main block link receives the transaction information containing the DAPP hash, the principal compares it with the previous block and stores it in the boutique medical blockchain. Finally, when the master node synchronizes with the network, the user will verify all DAPP blocks through the main blockchain, which means that it is not possible to delete the previous DAPP block from the main blockchain.