> For the complete documentation index, see [llms.txt](https://docs.zk.link/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.zk.link/architecture/settlement-layer.md).

# Settlement Layer

A classic ZK-Rollup network typically selects a single chain, i.e, Ethereum as the settlement layer to verify the proofs and settles the transactions. The settlement layer maintains the security and integrity of off-chain transactions.

In order to securely aggregate liquidity and native assets across L1s and L2s, zkLink introduces two new paradigms of settlement layer deployment solutions to its rollup infra framework - zkLink Nexus and zkLink Origin.

<table data-view="cards"><thead><tr><th></th><th data-hidden></th><th data-hidden></th><th data-hidden data-card-target data-type="content-ref"></th></tr></thead><tbody><tr><td>Working Principal of A Multi-Chain ZK-Rollup</td><td></td><td></td><td><a href="/pages/FlfDWZTmNXnuFzrVbPhc">/pages/FlfDWZTmNXnuFzrVbPhc</a></td></tr><tr><td>Nexus: Settlement on ETH ZK-L2s</td><td></td><td></td><td><a href="/pages/QH3dnFvk31IMA3ftvZhU">/pages/QH3dnFvk31IMA3ftvZhU</a></td></tr><tr><td>Origin: Settlement on ETH and Alt-L1s</td><td></td><td></td><td><a href="/pages/TgxKIrnoFbqXGElBkOJf">/pages/TgxKIrnoFbqXGElBkOJf</a></td></tr></tbody></table>