> For the complete documentation index, see [llms.txt](https://bithoventech.gitbook.io/bithoven/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://bithoventech.gitbook.io/bithoven/docs/whitepaper/bth-key-mechanics..md).

# BTH key mechanics.

Technical solution

* We have created a separate smart contract for each type of key.
* Chosen network - Polygon, token standard ERC-721.
* We use DAO voting mechanics.
* We mint BTH (user keys/cards) from each smart contract.
* Cross-chain support for 18 blockchains.
* We use Metamask wallet for authorization, and upon authorization, we check the wallet ID. If the wallet owns BTH, then access is granted with the corresponding level.
* The "Learn-and-Earn" reward mechanism.
* Developed web-3 custom node cross-chain protocol, NFT authentication service on Polygon.

  <br>