# Overview

<table data-full-width="false"><thead><tr><th width="112">Project</th><th width="284">Description</th><th width="371">Website</th><th>Stage</th></tr></thead><tbody><tr><td>BitLayer</td><td>The First Bitcoin security - equivalent Layer2 based on BitVM</td><td>website:<a href="https://www.bitlayer.org/">https://www.bitlayer.org/</a><br>twitter: <a href="https://twitter.com/BitLayerLabs">https://twitter.com/BitLayerLabs</a></td><td><a href="https://docs.bitlayer.org/">testnet</a> Released ;<br>Mainnet released in March 2024</td></tr><tr><td>ZKBase</td><td>Layer2 for Bitcoin &#x26; Ethereum</td><td>website:<a href="https://zkbase.org/">https://zkbase.org/</a><br>twitter: <a href="https://twitter.com/ZKBaseOfficial">https://twitter.com/ZKBaseOfficial</a><br>Telegram: <a href="https://t.me/ZKSpaceOfficial">https://t.me/ZKSpaceOfficial</a></td><td>Testnet in March 2024</td></tr><tr><td>Citrea</td><td>Bitcoin's First ZK Rollup Citrea is the first rollup that enhances the capabilities of Bitcoin blockspace with zero-knowledge technology, making it possible to build everything on Bitcoin.</td><td>website: <a href="https://citrea.xyz/">https://citrea.xyz/</a><br>twitter: <a href="https://twitter.com/citrea_xyz">https://twitter.com/citrea_xyz</a></td><td></td></tr><tr><td>Bitstake</td><td>A proof of stake bridge based on BitVM</td><td>introduction: <a href="https://lightco.in/2024/02/13/bitstake/">https://lightco.in/2024/02/13/bitstake/</a></td><td></td></tr></tbody></table>


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