> For the complete documentation index, see [llms.txt](https://tooneychain.gitbook.io/tooneychain/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://tooneychain.gitbook.io/tooneychain/3.-collection-world-cup-2022/g.-technical-architecture.md).

# g. Technical architecture

In this section, TonneyChain will explain its technical consideration, including its choice of blockchain, how to be able to use the main wallet Metamask for the first time, and the smart contract information.

We are used the OpenZeppelin standard ERC721 for all NFTs used in our dApp, find below the link to the code.

The official contracts for Tooneys is located at <https://etherscan.io/address/0x0DF39fcaF8183Ef3fC412441AdaAFd3F10C12360#code>

We also used the ECDSA cryptologic mechanism for the whitelist access.

If you have any questions or recommandations about the code used, feel free to contact <support@tooneychain.com>.