# Data Sources

<figure><img src="https://4201788747-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F5vTnL6SrT2qX7rXjH96E%2Fuploads%2FEjhmQojiWpevTLvQXSE2%2FUntitled%20(54).png?alt=media&#x26;token=9429ac6d-c0d7-48fe-99ee-b83114147a45" alt=""><figcaption></figcaption></figure>

### Backend Infrastructure aka Nodes

{% content-ref url="data-sources/evm-chains" %}
[evm-chains](https://docs.blocktorch.xyz/concepts/data-sources/evm-chains)
{% endcontent-ref %}

{% content-ref url="data-sources/roll-ups" %}
[roll-ups](https://docs.blocktorch.xyz/concepts/data-sources/roll-ups)
{% endcontent-ref %}

{% content-ref url="data-sources/local-forks" %}
[local-forks](https://docs.blocktorch.xyz/concepts/data-sources/local-forks)
{% endcontent-ref %}

{% content-ref url="data-sources/custom-event-data" %}
[custom-event-data](https://docs.blocktorch.xyz/concepts/data-sources/custom-event-data)
{% endcontent-ref %}

### Functions & Logic

{% content-ref url="data-sources/smart-contracts" %}
[smart-contracts](https://docs.blocktorch.xyz/concepts/data-sources/smart-contracts)
{% endcontent-ref %}

### Datafeeds

{% content-ref url="data-sources/oracles" %}
[oracles](https://docs.blocktorch.xyz/concepts/data-sources/oracles)
{% endcontent-ref %}

### Storage

{% content-ref url="data-sources/decentralized-datastorage" %}
[decentralized-datastorage](https://docs.blocktorch.xyz/concepts/data-sources/decentralized-datastorage)
{% endcontent-ref %}

### Authentication & Signing

{% content-ref url="data-sources/account-abstraction-modules" %}
[account-abstraction-modules](https://docs.blocktorch.xyz/concepts/data-sources/account-abstraction-modules)
{% endcontent-ref %}

### Frontends

{% content-ref url="data-sources/react-frontends" %}
[react-frontends](https://docs.blocktorch.xyz/concepts/data-sources/react-frontends)
{% endcontent-ref %}