> For the complete documentation index, see [llms.txt](https://docs.nested.fi/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.nested.fi/common-questions/what-happens-when-a-user-updates-a-nestednft.md).

# What happens when a user updates a Nested portfolio?

The NFT representing a portfolio also represents the ownership of the underlying assets. We've implemented a data structure that maps the asset composition of every NFTs delivered by Nested smart contracts. 

When a user changes the asset composition of their Nested portfolio, the smart contract that manages it automatically updates the global data structure. The NFT representing the user's portfolio isn't burnt and reminted at any point.