> For the complete documentation index, see [llms.txt](https://ballman.gitbook.io/whitepaper-2023/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://ballman.gitbook.io/whitepaper-2023/blockchain-contracts/titles-rankings-and-trophies.md).

# Titles, rankings and trophies

Finally, NFT Open Series rankings, main match results and trophies won are also recorded on a specific Smart Contract that authenticates the performance of a Ballman or any other NFT. To minimize the costs associated with transactions (gas fees), this Smart Contract is managed on the Polygon blockchain (compatible with Opensea).