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

# What is Sunblocks?

### Overview

Sunblocks is a software service that screens your blockchain transactions and checks them against our comprehensive address blacklists.

### What Does Sunblocks Offer?

* Address Blacklist APIs - Send an address to our api and we'll tell you if they're on one of the lists below. We maintain lists for the Bitcoin, Ethereum, and Solana blockchains.
  * OFAC SDN (Sanctions)
  * Ransomware Creators
  * Phishing NFT Creators
  * Exploiters