Citrea, a project incubated by Chainway Labs, has emerged from stealth with an ambitious proposal to scale Bitcoin through a Bitcoin-native ZK rollup. The project argues that Bitcoin can become a stronger foundation for broader financial and application activity if scaling is achieved in a way that still relies on Bitcoin’s own blockspace and settlement assurances. Rather than pushing execution and value capture away from Bitcoin, Citrea’s design is intended to keep settlement anchored to the network itself.
The proposal is built around ideas enabled by BitVM, which Citrea says make it possible to verify zero-knowledge proofs natively without requiring changes to the Bitcoin protocol. That is a key part of the project’s pitch: improving throughput and programmability while preserving Bitcoin’s base-layer rules. In a market where many scaling efforts trade off direct alignment with Bitcoin for speed or flexibility, Citrea is framing itself as a path that tries to extend Bitcoin without bypassing it.
A Different View of Bitcoin Scaling
Citrea takes a clear position on what should count as meaningful Bitcoin scaling. In its view, any system that does not use Bitcoin blockspace is not truly helping Bitcoin scale. Instead, such systems risk becoming parallel environments that compete with Bitcoin rather than reinforcing it. This argument goes beyond pure throughput and touches on where settlement occurs, where security assumptions ultimately reside, and where long-term network value accrues.
The project contrasts its approach with other well-known models in the Bitcoin ecosystem. It argues that the Lightning Network, while effective at improving payment efficiency, does not add the level of programmability needed to turn Bitcoin into a more universal financial base layer. At the same time, sidechains may enable broader functionality, but they shift execution and activity away from Bitcoin blockspace, meaning they do not directly strengthen Bitcoin’s own settlement layer in the same way.
Citrea’s answer is to split execution and settlement responsibilities. According to the project, transactions would ultimately settle using Bitcoin blockspace, while execution would be handled by its own virtual machine environment. In that structure, zero-knowledge proofs serve as the bridge that lets execution happen more efficiently off the base layer while maintaining a verification path tied back to Bitcoin.
ZK Proofs, Native Settlement, and Broader Ambitions
Citrea presents itself as more than a throughput upgrade. It claims to be the only execution layer on Bitcoin that settles on Bitcoin, while also describing its work as the first ZK proof verification and the first universal L2 verification inside Bitcoin. Those are strong positioning statements, and they highlight how the project wants to differentiate itself from both payment-focused scaling systems and external execution environments.
The broader ambition is to help make Bitcoin the base for “all-chain” activity by combining Bitcoin’s decentralization and security with a more flexible execution layer. In practical terms, Citrea is trying to turn Bitcoin into a network that can host a wider range of applications without requiring developers to abandon the trust assumptions that have made Bitcoin the most established blockchain in the market.
This framing reflects a growing interest across the industry in using Bitcoin not only as a store of value or settlement asset, but also as a platform capable of supporting more complex application layers. Citrea’s proposal sits directly in that conversation, offering a model in which Bitcoin remains the settlement anchor while execution is scaled outward through cryptographic proofs.
EVM Compatibility as a Strategic Advantage
One of Citrea’s most notable features is support for Ethereum Virtual Machine (EVM) applications. By making it possible to deploy or adapt EVM-based apps on top of Bitcoin, Citrea is targeting one of the biggest barriers to Bitcoin application growth: developer familiarity and tooling. The EVM remains the dominant smart contract environment in crypto, and compatibility with it could make Bitcoin more accessible to teams that already build for Ethereum and other EVM chains.
Citrea argues that many applications have been pushed to other blockchains because those environments offer programmability that Bitcoin has historically lacked. Its pitch is that these apps could instead be brought closer to Bitcoin’s security model if the right execution framework exists. In that sense, EVM support is not just a technical feature; it is a strategy to attract developers, liquidity, and user activity that might otherwise remain outside the Bitcoin ecosystem.
At the same time, the project says it is not limited to the EVM. Thanks to a modular architecture, Citrea says it can adopt new virtual machines in the future. That modularity is important because it suggests the team does not want to tie Bitcoin’s application future to a single execution standard. Instead, it aims to create a framework that can evolve as developer needs and blockchain infrastructure standards change.
Current Status and What Comes Next
Citrea says the project is already running in a private testnet. The team added that it is working toward launching a public testnet, with more details expected in the coming months. For now, the proposal remains at an early stage, but the transition out of stealth signals that the team is ready to bring its design into wider industry discussion.
The next milestones will likely be crucial. A public testnet would give developers, researchers, and Bitcoin infrastructure participants a chance to evaluate how the architecture performs in practice, how closely it can align with Bitcoin’s security model, and how realistic its EVM ambitions are. In Bitcoin-related scaling, the gap between conceptual elegance and production-grade implementation is often significant, so execution will matter as much as the design narrative.
Even so, Citrea’s emergence adds momentum to a broader trend: renewed experimentation around how to expand Bitcoin’s role without changing the protocol itself. If the project can demonstrate credible proof verification, practical settlement on Bitcoin, and a usable environment for developers, it could help redefine what “building on Bitcoin” means. At minimum, Citrea is putting forward a bold thesis: that Bitcoin can support richer application ecosystems and stronger scaling without giving up the properties that made it foundational in the first place.