The consensus team stabilized the Leios testnet with two prototype builds and a voting dashboard for endorser block observability. The High Assurance team shipped the Plinth Static Analyzer on the Visual Studio Marketplace and a JSON-RPC backend for property-based testing. Mithril completed the SNARK recursive circuit modularity work and upgraded the midnight-zk library. Under Voltaire, the van Rossem hard fork passed ratification and will enact at the next epoch boundary, advancing Plutus ahead of the Dijkstra era that introduces Ouroboros Leios. The research team published the Cardano Vision 2026 Mid-Year Progress and Transparency Report draft for community feedback.

The performance and tracing team removed the legacy iohk-monitoring tracing backend (roughly 11,000 lines) and RTView from cardano-tracer, while the ledger team extended StAnnTx memoization to Alonzo and merged the first Leios-related changes. In wallets, Lace released browser extension 2.1, headlined by a wallet security check feature. Under Voltaire, DRep voting is underway in the Constitutional Committee election ahead of the July 23 deadline, and the Research team advanced its Cardano Vision 2026 workstreams with the first zero-knowledge technical workshop.

The Consensus team improved Mithril integration for snapshot exports, while Lace Carbon began internal testing. For scaling, Hydra v2.2.0 launched with upgraded benchmarks, and Mithril finalized recursive SNARK verification. Under Voltaire, the Constitutional Committee election became competitive with five candidates for four seats, with DRep voting starting June 23. The Research team advanced its Cardano Vision 2026 workstreams.

The High Assurance team launched a smart contract testing beta tool, while the Mithril team completed its SNARK-friendly genesis certificate and optimized recursive scaling primitives. Under Voltaire, a critical call for candidates was issued for the upcoming Constitutional Committee election to ensure a competitive process. Finally, the Research team had its Cardano Vision 2026 proposal officially ratified by the community with 74.96% DRep approval.

The consensus team advanced the Leios prototype toward the Dijkstra era and finalized the certificate size reduction to 200 bytes. In wallets, Lace 2.0.6 went live, fixing DRep ID message signing for mnemonic wallets and adopting the CIP-129 format. For scaling, Hydra merged its partial fanout feature to eliminate the UTXO limit per head, while Mithril completed circuit key caching for its SNARK library.

The ledger team completed Plutus performance optimizations, while the Smart Contracts team secured funding to extend the "Blaster" verification tool into Aiken. For Leios, treasury funding was approved with 88% support, and a CIP-0164 update reduced certificate size by 40x. Additionally, candidate registration opened for the Constitutional Committee elections.

The consensus team added initial voting capabilities to the Leios prototype and retired the legacy V1 LedgerDB to simplify the API and clear the way for on-disk tables. In wallets, Lace launched on iOS, wrapping up its multi-platform rollout. Additionally, the Mithril team finalized recursive circuit refactoring and off-circuit verification tests for its SNARK prototype.

IO's core teams released Cardano Node v11.0.1 to support the upcoming protocol version 11 intra-era hard fork, while the ledger team advanced preparations for the Dijkstra era. The Plutus team enhanced the UPLC command-line tool, introducing script optimizations that yield over 10% in execution cost savings. In scaling, Hydra v2.1.0 was launched with 7% lower snapshot latency and protocol v12+ compatibility, and Mithril finalized key SNARK circuit validations and standard Schnorr signatures.

The consensus team advanced the Leios prototype by migrating flags to the Praos header, launching a dedicated testnet, and pre-releasing Cardano Node v11.0. In scaling, Hydra optimized benchmark performance for high transaction volumes, while Mithril completed data encoding and state transition tests for its recursive SNARK prototype. Additionally, the research team officially submitted their proposal on-chain.

This report marks the launch of IO’s 2026 treasury proposals on the official proposals website, accompanied by the Q4 2025 – Q1 2026 delivery report detailing recent technical milestones. The consensus team continues to advance the Ouroboros Leios prototype, while the Mithril team focuses on implementing succinct proofs (SNARKs) to enhance network scaling. In governance, the Intersect committee elections conclude their voting phase today, May 1, marking a key step in decentralized decision-making for the ecosystem.