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Citrea, a project aiming to bring zero-knowledge rollups (ZK-rollups) to Bitcoin, has closed a $2.7 million seed round led by Galaxy Ventures, the venture arm of Galaxy Digital.
The project said in a Feb. 2 blog <a href="https://www.blog.citrea.xyz/announcing-our-seed-round/" target="_blank" rel="noopener nofollow">post</a> that the funding would enable Chainway Labs — the blockchain infrastructure firm building Citrea — to bring it to market.
“Citrea is the first rollup that enhances the capabilities of Bitcoin blockspace with zero-knowledge technology, making it possible to build everything on Bitcoin,” the firm said in a statement.
The round closed in 2023 and saw participation from Delphi Ventures, Taproot Wizards co-founder Eric Wall, Blockscout founder Igor Barinov and others.
<blockquote class="twitter-tweet">
 2/6 Citrea is the first rollup that enhances the capabilities of Bitcoin blockspace with zero-knowledge technology. Citrea’s mission is to build a programmable liquidity layer on top of the most secure and decentralized blockchain, Bitcoin.— Citrea (@citrea_xyz) <a href="https://twitter.com/citrea_xyz/status/1760363776514338993?ref_src=twsrc%5Etfw">February 21, 2024</a>
</blockquote> 
ZK-rollups are concepts that have been more commonly linked to Ethereum through <a href="https://cointelegraph.com/learn/a-beginners-guide-on-blockchain-layer-2-scaling-solutions">layer-2 blockchains</a>, such as Polygon and zkSync.
ZK-rollups aim to be efficient and cheaper by bundling transactions on layer 2s and securing them using a cryptographic protocol called <a href="https://cointelegraph.com/explained/zero-knowledge-proofs-explained">ZK-proofs</a> to prove they happened to the base blockchain without needing to disclose the details of the transactions.
Bitcoin also has layer 2s, including the payments-focused Lightning Network and scaling projects rivaling Citrea, such as ZKSats and Rollux.
In its post, Citrea claimed its ZK-rollup addresses Bitcoin’s “challenges in handling more transactions” and supports “diverse applications without changing its consensus rules.”
“In doing so, Citrea leverages Bitcoin not only as a digital currency but also as a base layer for securing and settling transactions,” it added.
Related: <a href="https://cointelegraph.com/news/btc-price-drops-1-week-low-bitcoin-whales-nvidia">BTC price drops to 1-week low as traders focus on Bitcoin whales, Nvidia</a>
Bitcoin <a href="https://cointelegraph.com/magazine/bitcoin-miami-2023-shitcoins-for-bitcoin/">developers are divided</a>&nbsp;on how the blockchain should be used.
Some believe it <a href="https://cointelegraph.com/news/ordinals-and-brc-20-will-disappear-in-months-jan3-ceo-says">should retain its use</a> as a peer-to-peer electronic cash as described in its white paper, but recent projects like Ordinals, allowing for nonfungible token (NFT)-like assets, and the BRC-20 standard, allowing for speculative tokens, <a href="https://cointelegraph.com/news/vitalik-buterin-ordinals-revived-developers-on-bitcoin">have challenged that thinking</a>.
In a Feb. 6 blog <a href="https://www.blog.citrea.xyz/introducing-citrea/" target="_blank" rel="noopener nofollow">post</a>, Citrea said it aims to make Bitcoin “a base layer” for an ecosystem of blockchain games, NFTs and decentralized finance “without compromising Bitcoin security and changing its consensus rules.”
Its solution is also based on the Ethereum Virtual Machine, which “enables all the EVM developers to build on Bitcoin.”
Big Questions: <a href="https://cointelegraph.com/magazine/satoshi-nakamoto-zk-proofs-bitcoin/">What did Satoshi Nakamoto think about ZK-proofs?</a>

Citrea raises $2.7M in seed funding to launch Bitcoin ZK-rollup

Cointelegraph

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