> For the complete documentation index, see [llms.txt](https://treasurenft.gitbook.io/my-product-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://treasurenft.gitbook.io/my-product-docs/core-concept/system-architecture/core-architecture.md).
# Core Architecture
The core exchange architecture of TreasureNFT includes:
Currency Manager — It handles the whitelist of ERC-20 tokens that are valid for transactions on the system.
Execution Manager - It handles a list of valid execution policies that match manufacturers and acceptors.
Transfer Selector for NFT contracts, the NFT selector (RoyaltyFeeManager) - it provides a separate logic for how royalties should be collected. It supports ERC-2981 ("NFT royalty standard"), its own independent royalty registry (RoyaltyFeeRegistry), and plans to support future third-party royalty fee oracles.
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