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Arcium’s Substack · Oct 9, 2025

Public Testnet Phase 2 is LIVE

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Arcium · Arcium’s Substack

Arcium has entered Phase 2 of its Public Testnet, our biggest step yet toward realizing the encrypted supercomputer. This milestone expands the ecosystem with more apps, stronger infrastructure, and the first steps toward decentralization.

Phase 2 introduces the largest collection of encrypted applications available on Solana. These demos showcase a new design space for onchain apps powered by Arcium’s encrypted compute.

Furthermore, we are excited to announce Umbra Open Access Beta. Now, everyone can try, test, and experience mobile-first “incognito mode” on Solana.

In parallel, Umbra’s ICO on MetaDao is currently live! The raise has been a huge success so far and will continue until tomorrow, closing at 4PM CET. For more information, follow Umbra on X and check out the official ICO page here.

More apps will be added and shipped throughout Phase 2. You can explore everything on testnet by visiting our official testnet page.

For the first time, external operators can run Arcium nodes. This marks the beginning of the network’s path to decentralization, opening the door for broader participation in securing the encrypted supercomputer.

At this time, node operation is not incentivized, although we welcome any feedback the community may have! Head to our Discord to learn more, engage with other node operators, and get support to troubleshoot any issues.

Get started today with our node setup guide.

Phase 2 delivers faster compute, better developer tooling, and more comprehensive documentation. This foundation empowers developers to build encrypted applications with more speed and flexibility than ever before.

All documentation and resources can be found here.

Phase 2 is more than just an upgrade—it’s a turning point. With the largest encrypted app ecosystem, open node onboarding, and growing developer momentum, the encrypted supercomputer is moving from vision to reality.

Explore all of Phase 2 here. Get engaged by joining our Community.

As always, stay <encrypted>,
Your Arcium Team ☂️

Read the original on arcium.substack.com

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