Assets & Token Standards on Nervos
Nervos CKB uses Cell Model, an evolution of Bitcoin’s UTXO model, where all digital assets (fungible, non-fungible tokens, collectibles) are represented as immutable Cells exclusively owned by users. Each Cell contains ownership rules enforced by Scripts, ensuring that assets comply with protocol rules during transactions while remaining under the sole control of their owners.
What Counts as an On-Chain Asset?
Within this framework, any token or digital object represented with Cell—and capable of being owned, transferred, or redeemed by users—is considered a true on-chain digital asset. These assets include:
- Native tokens (CKBytes)
- User-defined tokens (sUDTs, xUDTs)
- On-chain digital objects (DOBs via Spore Protocol)
- Assets validated via RGB++ protocol linking Bitcoin and Nervos CKB
Overview of Token Standards
| Asset | Type | Equivalent | Description | Protocol |
|---|---|---|---|---|
| CKByte (CKB) | Native | / | Native utility and governance token | Native |
| xUDT Tokens | User-defined | ERC-20 | Extensive user-defined fungible tokens | xUDT |
| Spore | Digital Object (DOB) | ERC-721, Ordinals | Unique digital objects with redeemable intrinsic value, true on-chain ownership, privacy, and multi-content support | Spore Protocol |
| RGB++ | Isomorphically bound to Bitcoin | / | Enables bridgeless cross-chain asset issuance and interoperability between Bitcoin and Nervos CKB through isomorphic UTXO binding | RGB++ Protocol |