Cardano has opened the Midnight Dojo, the public testnet for Ouroboros Leios, the largest consensus-layer upgrade the protocol has seen since Shelley brought staking online in July 2020. IOG product manager Carlos described the goal as equipping what the team has built as the most secure blockchain in the space with throughput that can make it the operational system for the world.
Leios runs as an overlay on top of Praos rather than replacing it. Think of it as adding lanes to a highway rather than raising the speed limit. The upgrade introduces a second block type that runs alongside existing Praos blocks, with throughput targets of 100 to 1,000 transactions per second on the testnet and a realistic 5-20x mainnet lift once parameters settle.
Why it matters
This is a consensus-layer change, not a layer-2 or sidechain, which is why the project team is framing it at Shelley-scale. Since Shelley in 2020 the protocol has shipped incremental upgrades, but nothing at the base layer has restructured how blocks are produced. Leios preserves Praos's core security and decentralization model, the same one that has held since staking came online, while materially expanding capacity.
The testnet is structured in five phases: validation, parameter tuning, real load, adversarial stress, and mainnet prep. Carlos explicitly noted the team will deliberately put Leios under the most harsh conditions they know about, a posture that signals the upgrade is being treated as critical infrastructure rather than an experimental feature.
Market impact
ADA trades at roughly the same price it did when Shelley shipped in July 2020, a poetic coincidence the channel flagged heavily. RSI on the current drawdown is printing a lower low versus the prior cycle bottom, and ADA is down about 87% from its high, versus 91% on the prior cycle's deepest swing low.
The structural read: if Leios delivers anything close to its testnet throughput band on mainnet, Cardano moves from a chain that has consistently lost the throughput narrative to Ethereum and Solana into one that can credibly compete on the application-layer economics that follow. SPOs running stake pools are the operator base being asked to participate in the validation and parameter tuning phases now.
Frequently asked questions
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What is Ouroboros Leios and how does it differ from a layer-2?
Leios is a consensus-layer upgrade that runs as an overlay on top of Praos rather than replacing it. It introduces a second block type alongside existing Praos blocks, adding throughput capacity without altering the base security model. It is not a layer-2 or sidechain.
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What throughput improvement does Leios target on Cardano?
On the public testnet, Leios targets 100 to 1,000 transactions per second. IOG has framed the realistic mainnet lift once parameters settle at 5x to 20x, while preserving Praos's core security and decentralization properties.
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What are the phases of the Leios testnet on Midnight Dojo?
The testnet is structured in five phases: validation, parameter tuning, real load, adversarial stress, and mainnet prep. IOG has said the team will deliberately put Leios under the harshest conditions it knows about during adversarial stress.
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Why are some analysts comparing Leios to the Shelley upgrade in 2020?
Shelley brought proof-of-stake and staking online in July 2020 and is widely treated as the foundational change that turned Cardano into a usable network. Leios is the first base-layer restructuring of how blocks are produced since then, which is why the project team and community are framing it at similar scale.
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How can ADA holders or stake pool operators participate in the Leios testnet?
The Midnight Dojo testnet is currently in validation and parameter tuning phases. Stake pool operators are the operator base being asked to participate in those early phases before real-load and adversarial stress testing begins.
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