# Technical Principles Freeper will first be deployed on the BNBChain chain and will be compatible with multiple chains in the future. Currently the FreeID contract is implemented based on the ERC721 standard, the FreeID resolver contract is designed and implemented based on the principle of universality, the SNFT contract is implemented based on the ERC721 standard. The NFT/SNFT issued in Freeper are all of dNFT type (dynamic NFT), through the combination of oracle machine and NFT. the rights and functions of SNFT and social daemon card are constantly updated through the oracle machine, so that the metadata of NFT adapts to external data and events, through the on-chain and off-chain world. Freeper Chat and live events are based on the communication protocol provided by Tencent for data processing, which has been localized. The data in the Freeper platform are stored locally by the blockchain as well as the users, and the server we provide is only responsible for relaying the data. FreeID contract address: [0x6c89be4b5f0b995c062e5a49c5e396be90616050](https://bscscan.com/token/0x6c89be4b5f0b995c062e5a49c5e396be90616050) Freeper NFT (SNFT) contract address: [0x6c89be4b5f0b995c062e5a49c5e396be90616050](https://bscscan.com/token/0x6c89be4b5f0b995c062e5a49c5e396be90616050) --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://freeperwhitepaper.gitbook.io/2023/technical-principles.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.