> For the complete documentation index, see [llms.txt](https://docs.blocktorch.xyz/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.blocktorch.xyz/concepts/data-sources.md).

# Data Sources

<figure><img src="/files/OWZFFnKjvra74eDleRne" alt=""><figcaption></figcaption></figure>

### Backend Infrastructure aka Nodes

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[EVM Chains](/concepts/data-sources/evm-chains.md)
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[Roll-ups](/concepts/data-sources/roll-ups.md)
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[Local forks](/concepts/data-sources/local-forks.md)
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[Custom Event Data](/concepts/data-sources/custom-event-data.md)
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### Functions & Logic

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[Smart Contracts](/concepts/data-sources/smart-contracts.md)
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### Datafeeds

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[Oracles](/concepts/data-sources/oracles.md)
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### Storage

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[Decentralized Datastorage](/concepts/data-sources/decentralized-datastorage.md)
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### Authentication & Signing

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[Account Abstraction modules](/concepts/data-sources/account-abstraction-modules.md)
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### Frontends

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[React Frontends](/concepts/data-sources/react-frontends.md)
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