> For the complete documentation index, see [llms.txt](https://opendao.gitbook.io/whitepaper-v4/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://opendao.gitbook.io/whitepaper-v4/open-stablecoins/collateral-assets/popen.md).

# pOPEN