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Cardano & Ouroboros LeiosInput Output Global—Cardano completes Van Rossem hard fork, first fully on-chain governance upgradeCardano & Ouroboros LeiosInput Output Global—IOG advances Ouroboros Leios with ₳27.7M treasury proposal toward 2030 scaling targetsCardano & Ouroboros LeiosInput Output Global—Musashi Dojo public testnet launches Ouroboros Leios, showing 5–20x throughput gains

Cardano & Ouroboros Leios

by Input Output GlobalUS

Enable decentralized blockchain governance and scale throughput to support millions of daily transactions while maintaining security.

ScalingStage 5 of 5

Van Rossem hard fork done July 2026. Leios testnet June 2026; mainnet targeting Q4 2026.

Updated 18 Jul 2026Checked 11 Oct0 updates this week

Milestones

Next · Ouroboros Leios mainnet deployment
  1. Cardano mainnet launch2017Complete.
  2. Shelley era: incentive pools2020Complete.
  3. Alonzo era: smart contracts2021Complete.
  4. Babbage era: Plutus v2 (Vasil hard fork)22 Sep 2022Complete.
  5. Van Rossem hard fork: first on-chain governance upgrade18 Jul 2026Complete.
  6. Ouroboros Leios testnet (Musashi Dojo)23 Jun 2026Complete.
  7. Ouroboros Leios mainnet deploymentTarget Q4 2026Current milestone.

Most important updates

Upcoming

  1. Q4 2026Ouroboros Leios mainnet deployment (next)
  2. 2027Hydra and Midgard Layer 2 production use
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