High level overview​

This week, the Mithril team completed several SNARK-related tasks. They created a new module for the recursive SNARK circuit in the STM library, added support for test mode, refactored the bytes codec for forward and backward compatibility, synchronized updates from the non-recursive circuit prototype, prepared a testing plan for the IVC circuit, enhanced witness preparation for the non-recursive prover, and added golden tests for the recursive SNARK circuit prototype.

They also completed partial block range support, security parameter offset signing, and the WASM client implementation for Cardano blocks and transactions. In addition, they continued work on the explorer update and on documenting Cardano block and transaction signatures on the website. The team also progressed the upgrade to Cardano node v.10.7 and completed DMQ node updates to 0.4.1.0 and 0.4.2.0.

Finally, they completed cross-compiled Windows builds from Linux using Nix, fixed node build failures in Hydra CI, and investigated a SNARK aggregator certification stoppage on the dev network.

Low level overview​

Features​

• Completed the issue Refactor bytes codec in STM library for forward/backward compatibility #3065
• Completed the issue Support test mode for the recursive circuit #2984
• Completed the issue Create recursive SNARK circuit new module in STM #3123
• Completed the issue Synchronize updates of non recursive circuit prototype to STM library #3121
• Completed the issue Support partial block range in Cardano blocks and transactions #3099
• Completed the issue Sign security parameter offset in ProtocolMessage for Blocks and Transactions #3098
• Completed the issue Implement Cardano Blocks and Transactions in WASM client #3078
• Completed the issue Prepare Testing plan for IVC circuit #3124
• Completed the issue Implement a Cardano bundle Docker image #3189
• Worked on the issue Prepare production readiness for circuit keys and trusted setup in STM #3165
• Worked on the issue Enhance preparation of witness for the non-recursive prover in STM #3178
• Worked on the issue Add golden tests for recursive SNARK circuit prototype #3125
• Worked on the issue Update explorer for Cardano Blocks and Transactions #3079

Protocol maintenance​

• Completed the issue Update DMQ node to 0.4.1.0 #3114
• Completed the issue Update DMQ node to 0.4.2.0 #3196
• Completed the issue Cross-compile Windows builds from Linux using Nix #1886
• Completed the issue Mithril node build fails in Hydra CI #3161
• Worked on the issue Upgrade to Cardano 10.7 #2894
• Worked on the issue Document Cardano Blocks and Transactions signature in website #3101
• Worked on the issue Update client test in CI to check blocks and transactions #3159
• Worked on the issue SNARK aggregator certification stopped on dev-follower-preview #3183

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 and cardano-playground were updated with cardano-node 10.6.2, cardano-node pre-release 10.7.0, nixpkgs 25.11, ZFS AMI support, new Loki log dashboards, and extensive monitoring improvements including per-machine absent metrics alerting and mempool timeout alerts.

• The dijkstra network was fully respun with updated secrets, configs, and a Van Rossem PV11 cost model governance action prepared.

• CloudFormation stack hardening was applied: dedicated S3 server access logs bucket, TLS-only bucket policies, DynamoDB deletion protection with PITR, and KMS encryption.

• Ouroboros-network-ops was brought up to a recent cardano-parts release with new resource tagging for CloudFormation and OpenTofu resources.

Repository Work -- Merged​

Cardano-airgap​

cardano-airgap PR#13:

• Adds midnight-cli to the air-gapped signing toolset

Cardano-mainnet​

cardano-mainnet PR#42:

• Deploys all nodes to 10.6.2, and all dbsyncs to 13.6.0.7
• Upgrades nixpkgs to 25.11 and nix to 2.33-maint
• Adds bootstrap OpenTofu environment and ZFS AMI NixOS module support
• Adds Loki log shipping with four new log dashboards; removes superseded node-exporter Loki dashboard
• Adds per-machine machine_metrics_absent alert, tx mempool timeout alerts, and tightened blockHeight threshold
• Hardens CloudFormation stack with TLS-only policies, DynamoDB deletion protection and PITR, and KMS encryption
• Rotates the mainnet pool KES keys
• See the PR description for additional details

Cardano-parts​

cardano-parts PR#79:

• Bumps cardano-node release to 10.6.2, pre-release to 10.7.0, cardano-db-sync release to 13.6.0.7, pre-release to 13.7.0.1, and other component updates
• Bumps nixpkgs to 25.11 and nix to 2.33-maint with required compatibility fixes
• Introduces ZFS AMI support via a new ami.nix nixosModule with tank/{root,nix,home,state} dataset layout and new bootstrap OpenTofu environment
• Removes the deprecated Grafana Agent (EOL 2025-11-01), migrating fully to Grafana Alloy with Loki log shipping support
• Adds four new Loki log dashboards: cardano-node-logs.json, cardano-node-logs-json.json, systemd-logs.json, and systemd-logs-json.json
• Adds per-machine machine_metrics_absent alert with multi-offset detection; adds tx mempool timeout alerts; tightens blockHeight unchanged alert from 10 to 7 minutes
• Hardens CloudFormation stack: dedicated S3 server access logs bucket, TLS-only bucket policies, DynamoDB deletion protection with PITR, and KMS encryption
• Adds Van Rossem PV11 cost model JSON to template cost-models
• Restructures cardano-node.json dashboard with mempool timeout panels, instance filtering, and restart/version-change annotations
• Re-adds sanchonet support to process-compose stacks and template scripts
• See the PR description for additional details

Cardano-playground​

cardano-playground PR#55:

• Sets cardano-node release to 10.6.2, pre-release to 10.7.0, cardano-db-sync to 13.6.0.7, pre-release to 13.7.0.1
• Upgrades nixpkgs to 25.11 and nix to 2.33-maint
• Adds bootstrap OpenTofu environment and ZFS AMI NixOS module support
• Adds Loki log shipping with four new log dashboards; removes superseded node-exporter Loki dashboard
• Adds per-machine machine_metrics_absent alert, tx mempool timeout alerts, and tightened blockHeight threshold
• Creates dijkstra respin with new secrets, updated network configs, and Van Rossem PV11 cost model governance action
• Converts preview3-bp-c-1 and mainnet1-rel-a-3 to LSM storage backend
• Hardens CloudFormation stack with TLS-only policies, DynamoDB deletion protection and PITR, and KMS encryption
• Large colmena cleanup: group-based import system, removes metrics-scraper module
• Re-integrates sanchonet via upstream iohk-nix
• See the PR description for additional details

Ouroboros-network-ops​

ouroboros-network-ops PR#30:

• Bumps cardano-parts from v2025-06-24 to post-v2025-08-14
• Adds new resource tags to CloudFormation and OpenTofu resources: owner, project, costCenter
• Updates pre-existing organization and environment tags
• Applies breaking change updates from cardano-parts release

Devx-ci​

devx-ci PR#152:

• Bumps nix in linux and darwin hosts and guests to resolve: GHSA-g3g9-5vj6-r3gj / CVE-2026-39860
• Also bumps the darwin guest bootstrap nixpkgs version in apply.sh from 25.05 to 25.11

High level overview​

This week, the Mithril team completed the full review of the recursive SNARK circuit prototype, the impact assessment of SNARK on Mithril protocol security, and support for multiple proof systems in the STM library. They also completed SNARK proof generation and verification in end-to-end tests. They began work on the recursive SNARK circuit, including creating a new module in the STM library, and worked on a testing plan for the IVC circuit and production readiness for circuit keys and trusted setup. They also supported test mode for the recursive circuit and continued refactoring the STM library's byte codec.

Additionally, they completed the client CLI implementation for Cardano blocks and transactions and made progress on partial block range support, security parameter offset signing, and the explorer update for Cardano blocks and transactions.

Finally, the team completed the reqwest upgrade to 0.13 and continued work on the Cardano node upgrade to 10.7 and the DMQ node update to 0.4.1.0.

Low level overview​

Features​

• Completed the issue Full review of recursive SNARK circuit prototype #2982
• Completed the issue Impact of SNARK on Mithril protocol security #2803
• Completed the issue Support Multiple proof systems in STM #2550
• Completed the issue Implement SNARK proof generation and verification in end to end tests #3107
• Completed the issue Implement Cardano Blocks and Transactions in client CLI #3032
• Worked on the issue Refactor bytes codec in STM library for forward/backward compatibility #3065
• Worked on the issue Support test mode for the recursive circuit #2984
• Worked on the issue Create recursive SNARK circuit new module in STM #3123
• Worked on the issue Prepare Testing plan for IVC circuit #3124
• Worked on the issue Prepare production readiness for circuit keys and trusted setup in STM #3165
• Worked on the issue Support partial block range in Cardano blocks and transactions #3099
• Worked on the issue Sign security parameter offset in ProtocolMessage for Blocks and Transactions #3098
• Worked on the issue Update explorer for Cardano Blocks and Transactions #3079

Protocol maintenance​

• Completed the issue Upgrade reqwest to 0.13 #3033
• Worked on the issue Upgrade to Cardano 10.7 #2894
• Worked on the issue Update DMQ node to 0.4.1.0 #3114

High level summary​

The Plutus team has recently made a number of significant improvements to Plinth, including:

• Compiler improvements:
  • Added a type checker plugin that preserves source locations, resulting in significantly clearer error messages (#7640).
  • Added a second type checker plugin to detect unsupported Haskell features, further improving error reporting (#7659).
  • Added a driver plugin that automatically sets the required compiler flags and enables the Strict extension (#7687).
• Language improvements:
  • AsData now generates a destructor function for the data type (#7664). For matching on sum types, the destructor function is more efficient than the pattern synonyms.

The Plinth user guide will be updated soon. In the meantime, please refer to the linked PR descriptions for further details.

Additionally, a new UPLC optimization has been implemented: applications with three or more arguments are now transformed into case-constr form.

Low level summary​

Key Pull Requests Merged​

• Improve compile errors, and add Plinth.Plugin that preserves more source locations
• Plinth: improve error reporting for unsupported Haskell features
• Generate a destructor function from AsData
• Drop redundant unsafeCaseList calls produced by AsData
• Automatically set required flags and Strict extension in the plugin

High level summary​

• Ouroboros Leios (Treasury Funding Initiative 4: Ouroboros Leios Implementation):
  • Implemented Leios Endorser Block (EB) inclusion in the consensus layer, adding EB announcement and certification tracking to blocks, along with a SQLite-based backend for querying EBs and certificates (#1921).
• UTXO-HD (Treasury Funding Initiative 10: LSM including UTXO-HD):
  • Refactored database initialization by modifying mkOpenState in the ImmutableDB and VolatileDB (#1917).
  • Improved performance by caching transaction differences on first execution, addressing a hotspot observed during transaction revalidation on stressed nodes (#1954).
• Releases and integration (Treasury Funding Initiative 17: Maintenance and Support):
  • Released ouroboros-consensus-2.0.0.0 (#1947) and ouroboros-consensus-3.0.0.0 (#1964).
  • Integrated ouroboros-network-1.1.* (#1943).
  • Integrated the latest consensus packages into cardano-node for the upcoming Node 10.7 release (cardano-node#6402).
• Testing and documentation (Treasury Funding Initiative 17: Maintenance and Support):
  • Fixed a flaky ChainDB StateMachine test related to iterators (#1948).
  • Replaced the consensus documentation's Introduction page with a comprehensive System Overview, including a C4 Context diagram and clarifications on code organization and era evolution (#1950).