> ## Documentation Index
> Fetch the complete documentation index at: https://docs.molpha.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Quickstart: Smart Contracts

> Verify a Molpha payload in EVM, Solana, or Starknet applications.

Smart contracts consume Molpha by verifying a self-contained signed payload. You do not need to run a node, trust a relayer, or maintain a per-chain feed contract.

## What your contract receives

Every chain receives the same logical artifact:

* `DataUpdate` — `feedId`, `registryVersion`, `signaturesRequired`, `value`, `canonicalTimestamp`
* `SchnorrSignature` — aggregate scalar, commitment, and `signersBitmap`

The payload proves that the selected Molpha node quorum signed exactly that data. Your contract still enforces freshness, replay policy, and feed identity.

## EVM

```solidity theme={null}
require(verifier.verify(update, sig), "Molpha: invalid signature");
require(block.timestamp - update.canonicalTimestamp <= 60, "Molpha: stale");
require(update.feedId == EXPECTED_FEED_ID, "Molpha: wrong feed");

_useValue(update.value);
```

Full guide: [Verify on EVM](/guides/verify-on-evm).

## Solana

Use one of two patterns:

1. Read the latest maintained `Feed` account for low-latency consumption.
2. Verify a fresh payload directly with the `molpha-verifier` Rust crate when the decision needs point-in-time proof.

Full guide: [Read and Verify on Solana](/guides/read-and-verify).

## Starknet

Use the Cairo verifier with the same signed payload. The SDK can build Starknet-ready arguments from a gateway result.

Full guide: [Verify on Starknet](/guides/verify-on-starknet).

## Consumer checklist

* Verify the payload before using the value.
* Check `feedId` against the feed you intended to consume.
* Enforce `canonicalTimestamp` freshness.
* Track consumed payloads if replay matters.
* Decode `value` according to the feed schema.

## Next steps

<CardGroup cols={3}>
  <Card title="EVM verifier" icon="ethereum" href="/verifiers/evm">
    Solidity structs, registry layout, and gas notes.
  </Card>

  <Card title="Solana verifier" icon="sun" href="/verifiers/solana">
    Feed PDA layout, `submit_data_update`, and direct Rust verification.
  </Card>

  <Card title="Payload schema" icon="brackets-curly" href="/reference/payload-schema">
    Field-level reference for the signed artifact.
  </Card>
</CardGroup>