> For the complete documentation index, see [llms.txt](https://uniport.gitbook.io/uniport-doc/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://uniport.gitbook.io/uniport-doc/interoperability-layer.md).

# Interoperability Layer

- [About](https://uniport.gitbook.io/uniport-doc/interoperability-layer/about.md)
- [Dual Token System](https://uniport.gitbook.io/uniport-doc/interoperability-layer/dual-token-system.md)
- [UP](https://uniport.gitbook.io/uniport-doc/interoperability-layer/dual-token-system/up.md)
- [UBTC](https://uniport.gitbook.io/uniport-doc/interoperability-layer/dual-token-system/ubtc.md)
- [Governance](https://uniport.gitbook.io/uniport-doc/interoperability-layer/governance.md)
- [voUP](https://uniport.gitbook.io/uniport-doc/interoperability-layer/governance/voup.md)
- [Submit a proposal](https://uniport.gitbook.io/uniport-doc/interoperability-layer/governance/submit-a-proposal.md)
- [Technical Implemenation](https://uniport.gitbook.io/uniport-doc/interoperability-layer/technical-implemenation.md)
- [Overview](https://uniport.gitbook.io/uniport-doc/interoperability-layer/technical-implemenation/overview.md)
- [Bitcoin Cross-Chain](https://uniport.gitbook.io/uniport-doc/interoperability-layer/technical-implemenation/bitcoin-cross-chain.md)
- [Smart Contract Chain Cross-Chain](https://uniport.gitbook.io/uniport-doc/interoperability-layer/technical-implemenation/smart-contract-chain-cross-chain.md)