Cartesi Ecosystem Updates - June 2026

Newsletter/Jul 3, 2026/Marketing Unit

June answered a question builders have been asking for a while: what happens when an application stops and users need to recover their funds?

Emergency withdrawals are now live and being tested, more tooling has been shipped, and the clearest signal of the month came from the Cartesi Foundation board members. Two of them stepped down to commit to building on the stack full time. That doesn't happen unless the infrastructure is real and conviction is high.

Here's your full roundup of what happened across the Cartesi ecosystem this past month.

Tech

On the tech side, the headline release this month is Cartesi Rollups Node v2.0.0-alpha.12, bringing emergency withdrawal functionality to Authority, Quorum, and PRT applications. For the first time, users can withdraw funds from a foreclosed application and from accounts proven onchain, fully trustless end-to-end.

The release adds compatibility with the latest v3 Rollups Contracts and advances integration with the Permissionless Refereed Tournament (PRT) fraud-proof system, to enable applications to be foreclosed and users to securely recover funds through the withdrawal pipeline.

New CLI commands and JSON-RPC endpoints, including ‘cartesi_listWithdrawals’ and ‘cartesi_getWithdrawal’, cover the full lifecycle. The full CLI walkthrough is in this thread in the #rollups Discord channel.

The release also ships with Cartesi Machine Emulator v0.20.0 integration, removes the WebSocket dependency by switching blockchain synchronization to HTTP polling, and strengthens reliability through improved request handling, admission control, and validator safety checks.

This version is aimed at core developers and testers. See the full release notes and don’t hesitate to drop any feedback via Discord.

Developer tooling also received a broad update to match. Cartesi CLI 2.0.0-alpha.35 now catches configuration problems before startup, so there's no mid-session debugging when something's missing. Withdrawal testing is also available on Devnet, meaning the full withdrawal flow can be verified before going live.

The release adds TOML-based configuration for the ‘run’ command, improved CORS handling, and stricter environment variable validation, and adopts the latest Rollups Node, Machine Emulator, contracts, and Explorer releases.

The Rollups Explorer v2.0.0-alpha.3 now warns before sending transactions to foreclosed apps and adds status indicators showing the state of any application at a glance. Small UX change, real difference when testing in the wild.

The rollups-ts library also shipped updates this month, with new Wagmi React hooks and JSON-RPC bindings that make it easier to build on top of the latest Rollups infrastructure.

On the testnet side, fresh alphas of the Rollups Contracts and PRT dispute system were deployed to Sepolia and verified on Etherscan for full transparency. Contract addresses are published and ready to use. Grab the deployment addresses from this thread on Discord in the #rollups channel.

Our tech updates are also tracked monthly in L2BEAT's recap. Keep tabs on their X account and browse previous editions to catch up on everything.

Developer Advocacy

At Cartesi, lowering the barrier to building onchain is a Dev Advocacy priority, and June delivered on both education and demos.

Developer Advocacy Lead João Garcia wrapped up the three-part series called "Three Levels Deep." Each episode breaks down a different Cartesi concept at three levels of technical depth: simple enough for a child, detailed enough for an engineering student, and rigorous enough for a PhD researcher.

The series covers Cartesi's execution environment, app-specific rollups, and DeFi financial modeling. By explaining the same concept three different ways, it gives builders and researchers an entry point regardless of where they're starting from.

The full series is on X and YouTube, but in the meantime, check out the latest episode on how Black-Scholes, Monte Carlo simulations, logistic regression, and other traditional financial models need to be simplified to fit within Ethereum's gas constraints, but become computationally practical with Cartesi:

A Combinatorial Information Market demo went live this month, showing what deterministic, reproducible probabilistic inference looks like when running onchain. The demo models real-world forecasting variables as a connected probabilistic system rather than as isolated markets, capturing how inflation affects interest rates, how elections shape policy, and how outcomes in one domain ripple into others.

Under the hood, the demo uses a junction tree to perform exact inference and belief propagation to compute probabilities across local clusters rather than a single joint probability table.

This is the kind of computation financial systems routinely perform, and it can now be executed verifiably on Cartesi. Builders can explore the documentation and get started at docs.cartesi.io.

On another note, it's worth bringing this up again in case you missed it: make sure you check Shaheen Ahmed's vibe-coding series. It gathered three sessions and got sharper with each one, meant to inspire you to build with Cartesi and AI.

The first one put Cursor to a direct test to build an end-to-end Cartesi prototype with a Chainlink price feed and onchain computation. The result was impressive, and it tells you where the bar is.

The second brought a position risk feature to life inside the Cartesi Machine using a Python and NumPy stack, built for anyone managing exposure on Aave and similar protocols.

The third showed a bonding curve simulating token price mechanics onchain, a real building block for DeFi pricing and token economics.

Follow our Developer Advocate Shaheen to stay in the loop on more vibe-coding and AI-pilled builds.

Ecosystem

June finished with a signal worth pausing on.

Two Cartesi Foundation board members, Felipe Argento and Brandon Isaacson, stepped down to start building on Cartesi. Both shared their reflections publicly.

Felipe put it plainly: nobody is going to grasp what this stack makes possible from a diagram. They'll understand it through a product that's actually great. Read his thread.

Brandon pointed to the same opportunity from a financial perspective: the math, the risk models, and the complex logic TradFi runs every day are all possible on Cartesi, which means all of it is now possible on Ethereum. Read his take.

The people who know this stack best chose to build on it. Co-founder Erick de Moura shared what that moment means for the project:

Community

On the community front, a new batch of Cartesi GIFs has landed on X. Search "Cartesi" in the GIF tab next time you're posting and put them to use. Wisely or just for the fun of it.

The community also wrapped up a survey this month. Merch packs are heading to the first respondents who made their voices heard. The usual drill: unbox them on socials when they arrive, just like our community members Coderhema and Cartesian did:

June also brought two pieces of content worth saving and sharing in the community. If you're new to Cartesi or just want a clean reference to send someone, we put together a reintroduction: a single infographic that captures what Cartesi is, at a glance.

And if you want the fuller picture on why this matters for DeFi specifically, the 10 reasons DeFi needs Linux onchain thread breaks it down clearly. Both are worth bookmarking and passing along.

Media

On the media front, Dev Advocacy Lead João Garcia joined Web3CMO Stories to talk about what DeFi's next infrastructure layer looks like: Linux onchain, real computation, app-specific rollups. Give it a listen:

João also joined the ChainPatrol podcast for an insightful conversation on similar themes, but through the lens of security and Cartesi's approach in this area. Big shoutout to the hosts for having us. Check it out:

Beyond that, Cartesi continues to grow its presence in CoinMarketCap's community. And the platform still generates a steady stream of AI-powered articles covering our updates and what it means to build with the full Linux toolbox onchain, backed by Ethereum's security. Follow our profile there to stay in the loop.

Cartesi also joined TikTok this month. The channel is live and content is on the way. Be among the first to follow.

And if you haven't already, the Cartesi YouTube channel is worth subscribing to. Shorts, demos, and new tutorials drop there constantly.

These ecosystem updates hit Cartesians' inboxes every month through our newsletter, and this edition rewards the fastest reader with another merch pack. Subscribe if you haven't already and watch for the drop.

That’s a Wrap

June set a clear direction: emergency withdrawal infrastructure is live and tested, the tooling is sharper across every layer of the stack, and the people closest to the project are choosing to build on it.

Cartesi enters July with the foundation in place and a focused mission on becoming the verifiable compute layer DeFi has been waiting for. DeFi is the floor, not the ceiling, as our co-founder Erick de Moura has said before. Stay tuned for what we have in store for the second half of 2026.

As always, for live updates, join us on Discord, make sure you're following us on X, and come chat and hang out with the community on Telegram.