Charles Hoskinson: Leios Testnet Launch Marks Cardano’s Opening of Musashi Dojo

Charles Hoskinson marked the arrival of the Leios testnet on June 23, 2026, confirming that Cardano’s next major scaling prototype has entered public testing. In a video titled “Welcome Leios,” Hoskinson reacted to a presentation from Carlos from the Leios team and framed the launch as a major step in Cardano’s long term development roadmap.

The testnet, named Musashi Dojo, is designed as a training environment for the protocol, the community, engineers and developers. It invites stake pool operators, builders and dApp teams to test Leios, use it under real conditions and report where the system breaks before later mainnet readiness work.

Hoskinson’s response added an unusually personal tone to the technical update. After the Leios presentation, he said, “I’m stoked, I’m hyped,” while describing the testnet as the result of a decade of work across Cardano’s research and engineering history.

Leios Testnet Opens Public Testing for Cardano Builders

The Leios testnet is now live under the Musashi Dojo name, moving Cardano’s scaling work from prototype implementation into a public testing environment. In the presentation shown by Hoskinson, Carlos described Leios as a scaling solution for Cardano that started from an IO Research paper and was developed into a prototype implementation over the past year.

The testnet is not being presented as a finished mainnet upgrade. Its function is to expose the protocol to the infrastructure participants who can test how it behaves in practice. The Leios team specifically called for stake pool operators, builders and dApp teams to participate because these groups can provide feedback on performance, usability and failure points.

Carlos said the community should come to “test it, use it and break it,” adding that feedback from SPOs, developers and applications will help the team iterate toward software that can be prepared for a later mainnet path. That makes Musashi Dojo a practical validation phase rather than only a public announcement.

The testnet name comes from a training metaphor. The presentation connected Musashi Dojo to Miyamoto Musashi and the Book of the Five Rings, with the testnet phases named after that strategic framework. The same explanation linked Leios to two block types, one short and one long, reflecting the idea that no single tool works well in every condition.

Hoskinson Connects Leios to Cardano’s Ten Year Research Path

Hoskinson used the launch to connect Leios with Cardano’s longer technical history. He said the moment was “10 years” in the making and recalled earlier work around proof of stake, provable security and the effort to build a consensus model with properties comparable to Bitcoin while following a different architecture.

The emotional center of the video came after the Leios presentation ended. Hoskinson said, “We’re there,” “We got it done,” and then added, “I’m stoked, I’m hyped.” He described the launch as long overdue and said the ecosystem had put significant time, effort and money into reaching this point.

He also thanked Carlos and a wider set of contributors across Cardano’s development history, including names and teams connected to earlier eras of the ecosystem. Hoskinson specifically mentioned Blink, TX Pipe, Sundae, Cardano Foundation and the Amaru team, while pointing builders and stake pool operators toward the Musashi website, documentation and faucet access.

The tone of the video was stronger than a standard protocol update, but the substance remained centered on execution. Hoskinson presented Leios as part of Cardano’s research driven strategy, while the testnet gives external operators and developers a place to generate feedback before any future mainnet decision.

Musashi Dojo Adds a Live Step to Cardano’s Scaling Roadmap

Hoskinson placed Leios inside a wider sequence of Cardano scaling and consensus work. He referred to Peras for fast finality, Chronos for time synchronization independence, privacy related research paths and Minotaur for multi resource consensus. In that framing, Leios is one part of a broader protocol roadmap rather than a standalone feature.

He also described Leios as “the solution to the blockchain trilemma.” That statement is Hoskinson’s characterization of the project, while the public testnet phase is where operational data, failure reports and builder feedback can begin to shape the next development steps.

The launch came during a difficult period for parts of the Cardano community, with Hoskinson also referencing the SecondFi situation and acknowledging that impacted users were facing a bad day. He then returned to the Leios milestone and described Cardano as a system built through long running research, engineering and product work.

The immediate change is that Leios now has a live testing venue. Musashi Dojo gives SPOs, builders and dApp teams a defined environment to examine the protocol, report issues and test assumptions under progressively tighter conditions. For Cardano’s scaling roadmap, the milestone moves Leios from a scheduled testnet target into a public engineering phase with community participation.