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 and cardano-cli release versions are now set to 10.4.1 and 10.8.0.0, respectively, in cardano-parts release v2025-05-22.

• The upcoming node 10.5 [pre-]release is being configured to use genesis mode by default on preview and preprod environments.

• SRE is collaborating with IT Sec team to further harden our infra and clusters.

Repository Work -- Merged​

Cardano-parts​

• Sets node release to 10.4.1, cardano-cli release to 10.8.0.0 and mithril to v2517.1. Adds mithril ancillary key support for signed volatile and ledger state. Switches to a blockPerf fork which can be used without publishing metrics to CF, ex: for testnet usage. Includes additional misc fixes and improvements described in the PR/release header. cardano-parts-release-v2025-05-22

Cardano-mainnet​

• Sets node release to 10.4.1, cardano-cli release to 10.8.0.0 and mithril release v2517.1. Includes various improvements with cardano-parts release v2025-05-22. Deploys all machines to 10.4.1. cardano-mainnet-pr-34

Cardano-node​

• Bumps iohkNix for 10.5 network param changes, preview/preprod default GenesisMode consensus config, per env useLedgerAfter and peer-snapshot updates. Updates CI for the iohkNix config changes. In the cardano-node nixos service, sets preview and preprod environments to use peer-snapshots. Enables genesis mode to work OOTB for preview/preprod on: docker images, binary artifacts, nixos built machines. cardano-node-pr-6225

Cardano-playground​

• Sets node release to 10.4.1, cardano-cli release to 10.8.0.0 and mithril release v2517.1. Deploys blockPerf to all testnet machines without publishing metrics to CF. Includes various improvements with cardano-parts release v2025-05-22. Deploys all machines to 10.4.1. cardano-playground-pr-46

Iohk-nix​

• Adds mithril network ancillary verification keys: the ancillary verification keys are a breaking change required to pull ancillary mithril state (ie: ledger and volatile state) in addition to immutable state. In earlier mithril releases, the ancillary state was bundled together with the immutable state. iohk-nix-pr-598

• Node 10.5 updates: set GenesisMode for ConsensusMode as default on preview and preprod; tunes TargetNumberOfEstablishedPeers, and SyncTargetNumberOfEstablishedBigLedgerPeers per network team request; updates peer-snapshots per environment; updates useLedgerAfterSlot per environment. iohk-nix-pr-599

Repository Work In Progress -- PRs and Branches​

• Adawallet: https://github.com/input-output-hk/adawallet/pull/21
• Blockperf: https://github.com/cardano-foundation/blockperf/pull/31
• Cardano-airgap: https://github.com/IntersectMBO/cardano-airgap/pull/4
• Cardano-node: https://github.com/IntersectMBO/cardano-node/pull/6133
• Cardano-parts: https://github.com/input-output-hk/cardano-parts/pull/67
• Cardano-playground: https://github.com/input-output-hk/cardano-playground/pull/45
• Iohk-nix: https://github.com/input-output-hk/iohk-nix/pull/594

High level summary​

Last period we were finally able to drop support for older GHC versions. We also made some cleanup that was necessary as preparation work for further refactoring that is underway, which is necessary for both Leios and Nested Transactions. Refactoring definitions of protocol parameters is quite an accomplishment, since it drastically reduces complexity and eliminates unnecessary duplication for all eras. This refactoring not only reduced amount of code around protocol parameters for previous eras, but will also drastically simplify the process of adding new protocol parameters in the future eras.

Low level summary​

Features​

• PR-5028 - Deprecate balance in favor of a better named sumUTxO
• PR-5034 - Rename ppLens and ppuLens to make them more specific
• PR-5027 - Refactor PParams CBOR, JSON and Plutus Data serialization for reuse across eras and serializers
• PR-5007 - Remove ConwayNewEpochPredFailure
• PR-5011 - Ensure BabbageNonDisjointRefInputs is only checked for PlutusV3 scripts
• PR-5057 - Change Byron EBB stakeholderid to zero-or-more
• PR-5066 - Fix occurrence of items in maps in byron.cddl
• PR-5053 - Fix COMPLETE pragma for NativeScript ShelleyEra

Testing​

• PR-5016 - Bump formal-ledger-specifications
• PR-5012 - constrained-generators: Split abstract syntax out of Base.hs
• PR-5037 - Some hacking on improving error messages for lists
• PR-5049 - Golden tests for PParamsUpdate JSON serialization

Infrastructure and releasing​

• PR-5029 - Remove GHC 8.10 from nix-flake and GHA
• PR-5040 - Update to fourmolu-0.17.0.0
• PR-5041 - Update ghc versions
• PR-5039 - Bump base
• PR-5051 - Update the haskellNix flake input
• PR-5055 - Update the iohkNix flake input
• PR-5060 - Move the shellcheck CI into the main workflow file

High level overview​

This week, the Mithril team enabled incremental certification for the Cardano node database (version 2) on the release-mainnet network.

They continued work on the DMQ node implementation, completing the signature consumer and processor in the aggregator to support continuous signature handling, and added a mechanism to record the origin of each signature. The team also began adding support for UTXO-HD in the aggregator, signer, and client.

Finally, they addressed several bugs, improved CI workflows, and continued refactoring the STM cryptographic library.

Low level overview​

• Completed the issue Rollout Cardano Database v2 feature #2409
• Completed the issue Implement a signature processor for DMQ node in aggregator #2470
• Completed the issue Record signatures origin in the signature processor of aggregator #2478
• Completed the issue Add a Cardano node startup check step in the manual client test workflow #2471
• Completed the issue Some Cardano DB snapshots require full chain replay #2474
• Completed the issue Run internal crates tests on MacOS/Windows in the CI #2486
• Worked on the issue Add a Mithril client CLI command for UTxO-HD ledger state snapshot conversion #2492
• Worked on the issue Add support for ancillary verification key in config files of client CLI #2491
• Worked on the issue Upgrade to Cardano 10.4 #2487
• Worked on the issue Cleanup unexpected immutable files in archive in client #2429
• Worked on the issue Signer fails to access Cardano node after it has rebooted #2426
• Worked on the issue Re-organize STM library structure #2369

High level summary​

• Worked on a Genesis fix for an edge case in chain selection when the node is just caught-up (#1505).
• Worked on a Genesis fix to correctly disable ChainSync jumping when the node is caught-up (#1492).
• Discussed next steps on testing nodes via Antithesis in cooperation with the Cardano Foundation, in particular bespoke tooling (see this Discord message).
• Continued engaging with the Leios research team to help with open questions and decisions that the innovation team is currently handling.
• Made significant progress on the validators for the CDDL specs we are adding for the Cardano Blueprints (#1422). We are able to test that some of our golden CBOR files conform to the spec. Work is ongoing to extend the tests for the remaining golden files.
• Opened a PR to use an automatic formatter for ouroboros-consensus, which will help lower the barrier to entry for new contributors (#1500).

High-level summary​

We continue working away on fixes for deposits/incremental commits, and some UX and documentation improvements that have come about as a result of working with the Glacier Drop operators. We continue working on Blockfrost integration, event log rotation, and more UX improvements.

What did the team achieve?​

• Update the hydra-explore to track 0.21 #45
• Small updates to the tutorial around etcd #1991
• Fixes to the documentation #1636, #1752, #1975
• Embedded etcd into hydra-node to improve UX of running the node #1992
• Fix "UX" bug when changing peers on a previously-configured hydra-node #1965
• Reinstated Kupo support #1785 (pending merging the PR.)

What's next?​

• Finished new deposit check #1951
• Work on a simple endpoint to check head status #1957
• Continued work on a full Blockfrost chain layer #1305
• Investigate event-log rotation #1581
• Simplifty finding the hydra scripts #1441
• Add a way to query the head status #1957
• Continue to focus on supporting the Glacier drop