What did the team achieve?​

• Continued progress on partial fanout #1667, #2538
• Final touches on the "Directly Open Heads" feature #1329
• Investigating a blocker when upgrading to cardano-api 10.21 #2520
• Working on more resilient snapshots #2551

What's next?​

• Merge approach for resilient snapshots #2551
• Merge "Directly Open Heads" #1329
• Get more structure in our benchmarks #2439
• Release 2.0.0!

High level summary​

• Peras protocol development (Treasury Funding Initiative 17: Maintenance and Support):
  • Reviewed and merged the implementation of a model of the committee selection scheme, which defines how voters are chosen for Peras's fast-finality voting rounds (#1839).
  • Reviewed and merged the implementation of the node tracking Peras certificate progress on-chain, needed for the protocol's chain-selection rule (#1864).
• Node improvements (Treasury Funding Initiative 17: Maintenance and Support):
  • Released ouroboros-consensus-1.0.0.0 (#1926).
  • Reworked internal resource management for ledger state access, improving node robustness (#1910).
  • Fixed a bug in the immutable DB's chunk enumeration logic which only affected test coverage (#1923).
  • Integrated the Networking team's ouroboros-network 1.0 release (#1918, #1927, #1929).

High level overview​

This week, the Mithril team completed several SNARK-related milestones: they finished implementing the Halo2 circuit in the STM library, completed work on SNARK aggregation primitives for creating and verifying SNARK proofs, and finalized circuit refactoring, including modularity enhancements and a switch to a transcript hash function. They also completed the technical report for the recursive Halo2 circuit. The team continued work on the full review of the recursive SNARK circuit prototype, the impact assessment of SNARK on Mithril protocol security, wiring the SNARK proof into the aggregate signature, and activating the SNARK prover in the dev networks.

They also completed implementing the new prover for Cardano blocks and transactions, the client library, and enhanced the signed entity type configuration. They continued progressing on the client CLI implementation, partial block range support, and usage examples for Cardano blocks and transactions. Additionally, they kept working on the release process improvements, the removal of the legacy Cardano database backend in the client, and the enhancement of the protocol security page on the website.

Finally, they completed static builds of Mithril nodes in CI, finalized testing of the DMQ node 0.3.0 pre-release, and updated the Midnight ZK library audit status.

Low level overview​

Features​

• Completed the issue Implement Halo2 circuit in STM library #2895
• Completed the issue Refactor SNARK circuit - Modularity enhancement with gadgets #3039
• Completed the issue SNARK aggregation primitives: Create SNARK proof with circuit #3040
• Completed the issue SNARK aggregation primitives: Verify SNARK proof #3041
• Completed the issue Switch transcript hash function of circuit #3067
• Completed the issue Prepare technical report for recursive Halo2 circuit #2981
• Completed the issue Implement new prover for Cardano Blocks and Transactions #2987
• Completed the issue Implement Cardano Blocks and Transactions in client library #3031
• Completed the issue Enhance the support for signed entity types with configuration #3030
• Worked on the issue Full review of recursive SNARK circuit prototype #2982
• Worked on the issue Impact of SNARK on Mithril protocol security #2803
• Worked on the issue SNARK aggregation primitives: Wire SNARK proof in aggregate signature #3042
• Worked on the issue Activate SNARK prover in dev network #3104
• Worked on the issue Implement Cardano Blocks and Transactions in client CLI #3032
• Worked on the issue Support partial block range in Cardano blocks and transactions #3099
• Worked on the issue Implement examples for Cardano Blocks and Transactions #3100

Protocol maintenance​

• Completed the issue Implement static build of Mithril nodes in CI #2989
• Completed the issue Test DMQ node 0.3.0 pre-release in Mithril nodes #3053
• Completed the issue Update Midnight ZK library audit status #2983
• Worked on the issue Remove v1 backend for Cardano database in client library and CLI #3080
• Worked on the issue Update release process to anticipate on unreleased Cardano node #3070
• Worked on the issue Enhance protocol security page on website #2703

Overview of sprints: 108 and 109.​

Cardano Node 10.7.0​

We relased

• ouroboros-network-1.0.0.0 (later refined with ouroboros-network-1.1.0.0
• cardano-diffusion-1.1.0.0 which are integrated with the ongoing cardano-node-10.7 release.

See release board for all PRs included in these releases.

Leios​

PR / Issue	Status
Mux egress prioritisation	in progress
Performance improvement for tx-submission v2	in progress
TxSubmissionV2 demo	in progress
Expand network section	in review

Ouroboros-Network​

PR / Issue	Status	Notes
tx-submission robustness and testing enhancements	merged
RNG handling in SRV lookups for public root peers	closed	contribution by Saviour Uzoukwu
cardano ping implemented with ouroboros-network	blocked
mux: refactored ReadBuffer & socket API changes	merged
ledger-peers: introduced SignLedgerPeersKind	merged
cardano-ping: output valid JSON when no pongs are received	merged
Add {To,From}JSON instances for TxSubmissionLogicVersion	merged
[Cardano Topology: module exports][pr#5339]	merged
Haddock improvements	merged

DMQ-Node​

PR / Issue	Status	notes
SigSubmission v2	merged
Integration with cardano-tracer	in progress
[Churn test][#5303]	merged
Updated dependencies of dmq-node	merged
Improved documentation	merged
Fixed number of unacknowledged sigIds on the outbound side	merged
[Added pattern synonyms for EraIndex (CardanoEras c)][pr#1919]	merged	ouroboros-consensus change needed for Ledger peers
Ledger peers	merged
[dmq-node-0.3.0.0 pre-release][pr#37]	merged
Haddocks, docs & release scripts	merged

IOSim​

PR / Issue	Status
Added flushEventLog to MonadEventlog	merged
io-sim improvements	merged
PR review comments	merged
ghc-9.14 support	merged
io-sim: io-classes constraint	merged

What did the team achieve?​

• Released version 1.3.0!
• Continued great progress on partial fanout #1667, #2538
• Fixed an issue found under high L2 transaction load #2519 (thanks Delta DeFi team!)
• Improved logging when running the smoke-tests #2531

What's next?​

• Continue work on partial fanout
• Get more structure in our benchmarks #2439
• Support the upcoming Dijkstra Era #2495
• Implement the "Directly Open Heads" feature; simplifying the protocol #1329
• Upgrade to cardano-api 10.21 #2520