# 3.1 Design Principles

* Minimum Proof Unit (MPU)<br>
  * Fractionalize ownership, income, or usage rights of RWAs into verifiable NFT objects.<br>
  * Each MPU can function independently or be split/combined as a DeFi primitive.

* Universal Asset Wrapper (UAW)<br>
  * NFTs act as standardized interfaces between real assets and the on-chain world.<br>
  * Any asset type (real estate, carbon credits, invoices) can be mapped into this uniform structure.

* Layered Architecture

&#x20;\
&#x20;         ৹  XUnit is organized into Proof Layer → Liquidity Layer → Incentive Layer → Governance Layer, with independent yet composable modules.


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