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· 2 min read
Noon van der Silk

High-level summary​

We have been extremely busy these last few weeks supporting the glacier drop. We continue to focus on this, as well as starting to make some broader changes.

What did the team achieve?​

  • Released several patch versions; latest being 0.22.4

    • On this branch we have made many improvements:
    • Fix Hydra API not correctly interpreting events after event log rotation #2170
    • Ignore snapshot signatures of already confirmed snapshots; reduces load when running mirror nodes #2146
    • Fixed internal persistent queue blocking when it reached capacity #2147
    • Address etcd blocking on writes when under load #2171
    • Fixed log rotation id consistency #2173
    • Fix etcd lease keep-alive logic when the lease expired #2148
    • Fix InvalidTx causing stuck head #2134
    • Identified mirror nodes as a solution to node crashing and failing to restart #2117

  • On master

    • Added HTTP endpoint for submitting a transaction #2107
    • Allow partial Ada commit during incremental commits #2140
    • Hydra API server responds with content-type application/json #2094
    • Greetings message contains more information #2087
    • Fixed bug around fanning out with decommit/increment in progress
    • Hydra node rejects UTxO if it's below the limit #2106
    • Fixed log rotation id consistency #2173
    • Fix InvalidTx causing stuck head #2134

What's next?​

  • "Forward-port" the changes from 0.22.4 to master
  • Resolve the TUI being out of sync due to event-log rotation #2156
  • Start to investigate implementing partial fanout
  • Enable recovering a deposit when the head is closed #1812
  • Working on CI for Mac #2139
  • Working on a log viewer #2047
  • Present hydra doom at RareEvo
  • Continue to support the glacier drop

Thanks​

Big thanks to Juan and Jonathan for big contributions to these recent releases!

· One min read
Damian Nadales

High level summary​

During the past couple of weeks, the team has continued working across multiple workstreams: LSM-tree integration, Peras implementation, KES agent integration, and Leios prototyping. Current efforts include:

  • Implementing a streaming conversion for ledger snapshots.
  • Drafting a set of mini-protocols to cooperatively implement the Linear Leios specification. Particular focus is being placed on ensuring adequate concurrency and resource usage bounds, which are less explicitly defined in the high-level spec.
  • Releasing a stubbed version of kes-agent, and integrating it into the Consensus version targeted for Cardano Node 10.6. While the KES code will be included in this release, functionality will remain inactive pending a code audit.
  • Merging Peras-related optimizations into both the main and peras-staging branches.

· 2 min read
Ziyang Liu

High level summary​

Plutus Core​

  • Following the support for case analysis on booleans, integers and lists, we are now working on supporting case analysis for unit, pairs, and Data.

  • The required changes to enable all built-in functions, as well as sums-of-products, in all Plutus ledger languages (Plutus V1, V2 and V3) have been implemented in preparation for the upcoming intra-era hard fork.

  • We started developing a surface language benchmark for UPLC, aimed to compare the performances of different surface languages targeting UPLC. We have introduced the first scenario for comparison - computing Fibonacci numbers. More scenarios will be added in the near future.

Plinth​

  • The Plinth compiler now compiles Haskell Bool into UPLC's built-in boolean type, instead of sums-of-products or Scott encoded boolean. This makes many scripts smaller and faster.

  • We are planning additional performance and usability improvements, such as inlining recursive bindings, and showing line numbers in compilation errors.

Low level summary​

Key Pull Requests Merged​

Issues and Pull Requests In Progress​

· 2 min read
Marcin Szamotulski

Overview of sprints [93][sprint-93]​

Tx-Submission​

We deployed our tx-submission work (see Issue#3311 based on the cardano-node-10.5 release. The node has been working without any problems.

Mithril​

We prepared two PR which will allow us to capture raw bytes alongside decoded data structures. This is essential for checking signatures as well as avoiding re-serialisation of signed data:

These PRs are in review.

We now have a dmq node with the following capabilities:

  • can disiminate signatures, but not validate them in any way, although one cannot submit signatures (/work in progress/)
  • discover peers (with peer-sharing mini-protocol)
  • control connections through keep-alive mini-protocol
  • configuration file which allows setting diffusion options, setting up traces, etc.
  • basic logging system

In the current state of development, we were able to connect two dmq nodes and observe keep-alive messages. In the next stage, we will be able to submit signatures and observe how they are diffused through a network of dmq nodes.

Connection Duration​

We added a trace point which allows one to see how long a connection lived, see PR#5146.

Release of ouroboros-network-0.22.1​

We released ouroboros-network-0.22.1. It is already integrated with ouroboros-consensus and it will be included in cardano-node-10.6. See release-board.

· 3 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-node 10.5.1 has now been promoted to a full release for mainnet use and has been deployed to all of IOE's node SRE testnet and mainnet clusters.

  • A new docker OCI tag of 10.5.1-docker is additionally available for any OCI image users who want to use the snapshot-converter binary from within the image. The snapshot converter can be found at path /usr/local/bin/snapshot-converter. New cardano-node OCI release images going forward will contain the snapshot converter to facilitate ledger backend state changes without having to rely on host level tooling or a fully ledger replay.

  • Cardano-parameters is a new repo which maintains the mainnet, preprod and preview protocol parameters with a daily update, as reported by the BlockFrost Cardano API service.

Repository Work -- Merged​

Cardano-mainnet​

  • Cardano-node release has been updated to 10.5.1. Rotates KES, cleans up 10.5.0 module code no longer needed and deploys select bootstraps with an EgressPollInterval modifier. cardano-mainnet-pr-37

Cardano-monitoring​

  • A modernization and security update PR which updates most flake pins, patches grafana for CVE vulnerabilities, updates the opentofu-registry and adds filtering for alpha/beta versions, updates tofu resource declarations and recipes, migrates to SSH over SSM, fixes some race conditions on reboot and more. See the PR header for details. cardano-monitoring-pr-2

Cardano-node​

  • For the purposes of a 10.5.1-docker OCI image tag, adds snapshot-converter to the nix overlay and bundles it into the cardano-node OCI image. Adds documentation with example command usage. cardano-node-compare

Cardano-parts​

  • Cardano-node pre-release has been updated to 10.5.1. A nix packaged version of cardano-signer has been added, blockperf and credential-manager tools updated. Nix jobs for facilitating governance activities have been improved, easing operations. cardano-parts-release-v2025-07-23

  • Cardano-node release has been updated to 10.5.1. cardano-parts-release-v2025-07-25

Cardano-playground​

  • Cardano-node pre-release has been updated to 10.5.1. Adds playground gov action support scripts, preview/preprod committee state changes and relevant gov action artifacts. Includes various improvements with cardano-parts release v2025-07-23. See the PR header for details. cardano-playground-pr-49

  • Cardano-node release has been updated to 10.5.1. Fixes a playground voting script to work with sops decrypt using bash array args; drops some deprecated code and updates cardano-book. cardano-playground-pr-50

Devx-ci​

  • Nix-darwin was updated to 25.05 requiring updating of the Darwin guest bootstrap scripts as well as the Buildkite modules. Deprecated Hetzner Darwin materialization for a legacy ssh problem was removed and Hydra impermanence config was updated. devx-ci-compare

Repository Work In Progress -- PRs and Branches​