> For the complete documentation index, see [llms.txt](https://docs.lumia.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.lumia.org/ecosystem/lumia/architecture/polygon-cdk-and-agglayer/the-lumia-chain-framework-and-settlement.md).

# The Lumia chain framework and settlement

**Who this is for:** developers and issuers who want to know which parts of Lumia's stack are Lumia-specific and which come from shared infrastructure. **You should already know:** [Architecture](https://app.gitbook.com/s/chmhPiVNAafGw48c4oU2/ecosystem/lumia/architecture).

**Lumia runs on proven zkEVM infrastructure rather than a bespoke, one-off implementation.** Its sequencer, prover, and bridge software come from the Polygon Chain Development Kit (CDK), a framework for assembling a zkEVM chain out of standard, interoperable components (see [What Lumia's chain is built with](https://app.gitbook.com/s/chmhPiVNAafGw48c4oU2/ecosystem/lumia/architecture/polygon-cdk-and-agglayer/what-the-lumia-chain-is-built-with)). Building on the CDK is also what lets **Lumia settle through AggLayer**, the shared settlement and bridging hub on Ethereum L1 (see [How Lumia settles and bridges to Ethereum](https://app.gitbook.com/s/chmhPiVNAafGw48c4oU2/ecosystem/lumia/architecture/polygon-cdk-and-agglayer/how-lumia-settles-and-bridges-to-ethereum)).

{% hint style="info" %}
It should not be confused with the separate **Lumia Passport** product, which lives under Use Lumia and is unrelated.
{% endhint %}

<table data-view="cards"><thead><tr><th></th><th></th><th data-hidden data-card-target data-type="content-ref"></th></tr></thead><tbody><tr><td><strong>What Lumia's chain is built with</strong></td><td>The sequencer, prover and settlement services Lumia's chain runs, and the Polygon CDK framework they come from.</td><td><a href="https://app.gitbook.com/s/chmhPiVNAafGw48c4oU2/ecosystem/lumia/architecture/polygon-cdk-and-agglayer/what-the-lumia-chain-is-built-with">https://app.gitbook.com/s/chmhPiVNAafGw48c4oU2/ecosystem/lumia/architecture/polygon-cdk-and-agglayer/what-the-lumia-chain-is-built-with</a></td></tr><tr><td><strong>How Lumia settles and bridges to Ethereum</strong></td><td>What Lumia gets from being a member of Polygon's shared AggLayer settlement hub.</td><td><a href="https://app.gitbook.com/s/chmhPiVNAafGw48c4oU2/ecosystem/lumia/architecture/polygon-cdk-and-agglayer/how-lumia-settles-and-bridges-to-ethereum">https://app.gitbook.com/s/chmhPiVNAafGw48c4oU2/ecosystem/lumia/architecture/polygon-cdk-and-agglayer/how-lumia-settles-and-bridges-to-ethereum</a></td></tr></tbody></table>