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· One min read
Noon van der Silk

High-level summary​

We finished the final important security check for logic around deposits, and have implemented a selection of UX/usability improvements around logging and errors and informative APIs for the head state. We will aim to release a new vresion soon, and fix some other small bugs. We continue supporting the glacier drop.

What did the team achieve?​

  • Finished the final piece on deposit logic checks #1978
  • Improved UX for networking misconfigurations #2026
  • Implemented event-log rotation #1581
  • Implemented API query for head status #1957
  • New observer API in the hydra-explorer #47
  • Progress on simplifying UX around hydra scripts #1441
  • Started planning the roadmap for Hydra in 2025-2026
  • Continued to support the glacier drop

What's next?​

  • Release version 0.22.0!
  • Fix bug where head state as erroneous spendableUTxO #2037
  • Fix peers with different persistence causing hydra-node to crash #1937
  • Continue working on improving etcd UX #2054
  • Merging the simplified approach to finding the hydra scripts #1441
  • Better UX around etcd errors #1937
  • Continue to focus on supporting the glacier drop

· One min read
Damian Nadales

High level summary​

  • Posed various clarifying "low-level" questions to the rest of the Leios Team after catching up on the Leios protocol and ledger designs. For the Consensus Team, the next step is to add transactions to the Haskell Leios simulator.
  • Fixed Ledger CDDLs (#5085, #5109).
  • Fixed encoding of WithOrigin in the TPraos ledger state snapshot (#1535).
  • Implemented a cddl validator in Cuddle (#68) and released cuddle 0.5.0.0.
  • Prevented a race condition when snapshotting LedgerDB.V2 (#1555).
  • Assessed the proposed VRF tiebreaker change (#1548). An analysis of the effects of using the leader VRF as the tiebreak VRF can be found here. We encourage community members who wish to discuss this change to join our next Technical Working Group meeting on Thursday, June 19, at 14:30 UTC.

· 2 min read
Jean-Philippe Raynaud

High level overview​

This week, the Mithril team released the pre-release version of the 2524.0-pre distribution. This version supports Cardano node v.10.4.1 and introduces a new Mithril client CLI command for converting UTXO-HD ledger state snapshots. It also includes various bug fixes and improvements.

The team completed the extension of aggregator metrics to track different client types and finalized preparations to stabilize the Cardano DB v2 client commands in both the CLI and API for production use. They also worked on implementing the publisher using the n2c local message submission mini-protocol from the Pallas library for the DMQ node, and continued transitioning protocol message encoding to binary.

Finally, they refactored parts of the standard library and continued refactoring the STM cryptographic library.

Low level overview​

  • Pre-released the new distribution 2524.0-pre
  • Completed the issue Add a Mithril client CLI command for UTxO-HD ledger state snapshot conversion #2492
  • Completed the issue Record usage of client type in metrics #2494
  • Completed the issue Stabilize Cardano DB v2 client CLI/library - Phase 1 #2493
  • Worked on the issue Release 2524 distribution #2488
  • Worked on the issue Switch messages encoding to binary hex #2536
  • Worked on the issue Loose enforcement of OpenAPI compatibility #2535
  • Worked on the issue Verify an existing Cardano database with client CLI #2537
  • Worked on the issue Implement a publisher with the n2c Local Message Submission mini-protocol with Pallas #2539
  • Worked on the issue Split mithril-common crate - Phase 2 #2392
  • Worked on the issue Re-organize STM library structure #2369

· 2 min read
Ziyang Liu

High level summary​

Over the past two weeks, the Plutus Core team has completed the implementation of case analysis for booleans and integers. The PR is currently pending merge.

On the Plinth side, we've made several improvements:

  • Added support for evaluating CompiledCode using the CEK machine. A new user guide page explains how to use this functionality.
  • Enhanced ToData and FromData instance generation: product types can now use the List constructor of Data instead of Constr, resulting in improved efficiency.
  • Expanded the API for builtin lists with additional utility functions.

We’ve completed the Plutus section of the blueprint, which we hope will be helpful for those implementing alternative Plutus evaluators. We invite the community to give it a read and share feedback.

Finally, we’ve begun releasing plutus-metatheory on CHaP, paving the way for integrating the certifier into the Plinth compiler.

Low level summary​

Key Pull Requests Merged​

Issues and Pull Requests In Progress​

· 2 min read
John Lotoski

High level summary​

The SRE team continues work on Cardano environment improvements and general maintenance.

Some notable recent changes, updates or improvements include:

  • Cardano parts, cardano-playground and cardano-mainnet clusters were updated to nixpkgs 25.05 with nix 2.29.1 and all machines deployed.

  • Cardano-airgap repo now has the ISO available for download via hydra CI server.

  • The cardano-node new tracing system related PRs currently listed in the "Repository Work In Progress" section are planned for merge prior to 10.6.0 tagging. This will make the binary artifacts, docker images and book config default to use of the new tracing system.

Repository Work -- Merged​

Adawallet​

  • An adawallet maintenance PR, bumping flake inputs, repackaging cardano-hw-cli from source, fixing cardano-cli and cardano-hw-cli breaking changes in the new versions, and adding various features and improvements. Details in the PR header. adawallet-pr-21

Cardano-airgap​

  • An airgap maintenance PR, updating nixpkgs, integrating adawallet, fixing misc version breaking change issues, adding the ISO image to hydra and other various features and improvements. Details in the PR header. cardano-airgap-pr-4

Cardano-parts​

  • Sets nixpkgs to 25.05, and nix to 2.29.1. NixosModules and just recipes with breaking changes from those updates were fixed along with other miscellaneous improvements detailed below in the PR/release header. cardano-parts-release-v2025-06-05

Cardano-mainnet​

  • Nixpkgs has been updated to 25.05 and nix to 2.29.1. NixosModules and just recipes with breaking changes from those updates were fixed. Includes various improvements with cardano-parts release v2025-06-05. cardano-mainnet-pr-35

Cardano-node​

  • Bumps iohkNix flake pin to adjust QueryBatchSize declared default from 100 to 100000 to match the Consensus UTXO HD Migration Guide. Adjusts corresponding config files to match iohkNix update and for related CI jobs to pass. cardano-node-pr-6235

Cardano-playground​

  • Nixpkgs has been updated to 25.05 and nix to 2.29.1. NixosModules and just recipes with breaking changes from those updates were fixed. Includes various improvements with cardano-parts release v2025-06-05. cardano-playground-pr-47

Iohk-nix​

  • Adjust the QueryBatchSize declared default from 100 to 100000 to match the Consensus UTXO HD Migration Guide. iohk-nix-pr-600

Repository Work In Progress -- PRs and Branches​