> For the complete documentation index, see [llms.txt](https://sp8de-docs.gitbook.io/s-p-8-d-e-or-white-paper/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://sp8de-docs.gitbook.io/s-p-8-d-e-or-white-paper/smart-contract-user-funct..md).

# Smart-contract User funct.

User can buy and decrypt QRNG

<figure><img src="https://3112201423-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FvE1qTxK5RQkiRxrDR1jq%2Fuploads%2F27OiUTgJLZzHMYxLRNGT%2FS%20P%208%20D%20E%20_%20Smart%20contract.png?alt=media&amp;token=0fcdacfb-7b6c-4c08-a944-23679645291b" alt=""><figcaption></figcaption></figure>