# 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="settlement-layer/working-principal-of-a-multi-chain-zk-rollup">working-principal-of-a-multi-chain-zk-rollup</a></td></tr><tr><td>Nexus: Settlement on ETH ZK-L2s</td><td></td><td></td><td><a href="settlement-layer/nexus-settlement-on-eth-l2s">nexus-settlement-on-eth-l2s</a></td></tr><tr><td>Origin: Settlement on ETH and Alt-L1s</td><td></td><td></td><td><a href="settlement-layer/origin-settlement-on-eth-and-alt-l1s">origin-settlement-on-eth-and-alt-l1s</a></td></tr></tbody></table>