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· One min read
Damian Nadales

High level summary​

  • Completed the LSM work in Consensus. Remaining LSM work is just integration in API, CLI, and Node which will be done as part of Node 10.7. In particular we:
    • Made forkers more observable (#1773).
    • Updated the code to reject legacy snapshots (#1774).
    • Updated to latest LSM-trees (#1776), including dependency updates to allow older filepath (#804) and older unix (#805).
  • Fixed a deadlock in the V1LMDB mempool implementation (#1787, #1798).
  • Resolved a memory leak in benchmarks for the 10.6.1 release (#1802).
  • Prepared a 10.6.1 node with LSM-trees for preliminary deployment on a relay to gather performance measurements.
  • Successfully compiled an untested prototype of a node using different tables per block, preparatory work for LedgerHD planned for Node 10.8.
  • Modified cardano-testnet to support running with kes-agent.
  • Made progress on migrating Leios demos to ouroboros-leios, including traffic control support for network delay and bandwidth configuration in Leios experiments (#651). The remaining work involves making sure CI passes and incorporating review feedback.
  • Continued work on Node 10.7 integration.

· 2 min read
Jean-Philippe Raynaud

High level overview​

This week, the Mithril team continued focusing on the SNARK-friendly STM library, simplifying its code and implementing some wrappers for the Jubjub backend. They also made progress by specifying the non-recursive SNARK circuit, assessing constraints on Halo2 verification keys, designing a testing strategy for SNARK circuits, prototyping the recursive SNARK solution, and completing a prototype of the Bitcoin DeFi prover with RISC Zero.

Additionally, they completed the simple aggregator discovery mechanism, worked on improvements to the protocol security page, and completed the second phase of the common aggregator client implementation.

Finally, they worked on CI enhancements by implementing dependency license enforcement and fixing bugs in crate publication, and kept upgrading the Cardano node to v.10.6.

Low level overview​

Features​

  • Completed the issue Implement a simple aggregator discovery mechanism #2726
  • Completed the issue Prepare specifications for the Mithril circuit #2797
  • Completed the issue Prototype Bitcoin Defi Groth16 proof generation with Risc Zero #2835
  • Completed the issue Prepare new Lagrange Mithril era for SNARK support #2809
  • Completed the issue Full review of SNARK circuit prototype #2769
  • Completed the issue Trusted setup for Mithril Halo2 SNARKs #2800
  • Completed the issue Compute the IVC state with SHA256 in the recursive circuit #2806
  • Worked on the issue Document recursive SNARK solution #2767
  • Worked on the issue Experimental blst-Jubjub #2772
  • Worked on the issue Implement Jubjub/Poseidon backends wrappers in Schnorr signature scheme #2817
  • Worked on the issue Assess constraints on Halo2 circuit verification #2799
  • Worked on the issue Update protocol parameters to SNARK friendly values #2813
  • Worked on the issue Proposals for Mithril/DMQ as optout feature of Cardano #2831

Protocol maintenance​

  • Completed the issue Implement a common aggregator client - Phase 2 #2827
  • Completed the issue Crates publication fails if one crate is already published #2824
  • Completed the issue Check external crates license compatibility in CI #2746
  • Worked on the issue Upgrade to Cardano 10.6 #2790
  • Worked on the issue Enhance protocol security page on website #2703

· 2 min read
Marcin Szamotulski

Overview of spint 102​

Leios​

We completed a basic prototype of a request-respond mini-protocol that supports server-side message reordering while ensuring both deadlock and livelock freedom. The prototype was reviewed by the consensus and formal methods teams. Next development steps involve simplifying the API and evaluating specific modifications tailored for Leios. At this point, we consider the technical risk of this development direction to be addressed and are transitioning to other, higher-priority Leios tasks.

Mithril​

We're moving the development to a new repository: https://github.com/IntersectMBO/dmq-node

Ouroboros Network​

Cardano Node​

· 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:

  • Within approximately 1 day of the preview network partition occurring, mentioned in the last biweekly SRE update, mainnet experienced a similar partition. Again, after an intense multi-team and community collaborative effort which the SRE team was participating in from the beginning, a new cardano-node version 10.5.3 was released to fix the issue, with all network participants on problematic versions encouraged to upgrade immediately so that the partition would resolve itself as the majority of stake aligned under node versions with proper ledger hash handling. Indeed, with the quick reaction of the community as a whole, the network partition resolved within approximately 14 hours. Various after action reports are available detailing the event, such as Pi Lanningham's Poison Piggy - After Action Report

  • Subsequent to the mainnet fork event above, 10.6.1 has also been pre-released and deployed to IOE pre-release infrastructure. The SRE team has also been participating in other after action investigation activity.

Repository Work -- Merged​

Cardano-mainnet​

  • Bumps and deploys cardano-node release to 10.5.3

  • Fixed Mithril scripts due to Mithril aggregator upstream API breaking changes

  • Updates the save-ssh-config recipe to match opentofu ssh config artifact output

  • Cleaned up flake.nix inputs and some colmena modules code

  • Modifies two bootstrap EBS gp3 volumes to accommodate some data handling work

    cardano-mainnet-pr-40

Cardano-parts​

  • Bumps cardano-node release to 10.5.3, pre-release to 10.6.1, and cardano-db-sync pre-release to 13.6.0.6

  • Mithril script code for node entrypoint, systemd ExecPre and process-compose jobs were fixed to accommodate breaking upstream API changes

  • The pkgs.nix flakeModule was re-factored to make switching between localFlake and capkgs pins easier

    cardano-parts-release-v2025-12-04

Cardano-playground​

  • Bumps and deploys cardano-node release to 10.5.3, pre-release to 10.6.1, and cardano-db-sync pre-release to 13.6.0.6

  • Updates the cardano-book for the corresponding cardano-node release and pre-release updates

  • Adds a metrics scraper nixosModule for perf team custom data analysis

  • Fixed Mithril scripts due to Mithril aggregator upstream API breaking changes (via cardano-parts pin update)

  • Updates the save-ssh-config recipe to match opentofu ssh config artifact output

  • Cleaned up flake.nix inputs and some colmena modules code

    cardano-playground-pr-52

Repository Work In Progress -- PRs and Branches​

· One min read
Noon van der Silk

What did the team achieve?​

  • Implemented the "SafeClose" feature #2330
  • Continued working on partial fanout #1468
  • Continued working on chain following approach #2206
  • Organised a lovely team off-site!
  • Worked on running hydra-node on a Rasberry PI #2353
  • Added API to retrieve head start timestamp #2316
  • Added blockfrost support to the TUI #2032
  • Released version 1.2.0!

What's next?​

  • Finish Rasberry PI demo #2353
  • Continue working on partial fanout #1468
  • Continue work on chain-following improvements #2206
  • Tighten up documentation around contestation period #2389
  • Add a few more test cases to our HTLC demo