This is the monthly report on the progress of the Hydra and Mithril projects for October 2025. It serves as preparation for, and a written summary of, the monthly stakeholder review meeting. The meeting is announced on our Discord channels and held on Google Meet. This month, the meeting took place on November 6, 2025, using the presentation slides; the recording is also available.
Mithril
Issues and pull requests closed in October
DMQ implementation update
Here is the current status of the DMQ implementation:
| Mini-protocols | Pallas | Mithril signer | Mithril aggregator | Mithril relay | Haskell DMQ node |
|---|---|---|---|---|---|
| N2C submission | ✓ | ✓ | - | ✓* | ✓ |
| N2C notification | ✓ | Planned | ✓ | ✓* | ✓ |
| N2N diffusion | Planned | - | - | - | ✓ |
The networking team continued working on message authentication in the n2n mini-protocol and on peer discovery from the ledger state of the Haskell DMQ node. We kept integrating it with the Mithril nodes and completed end-to-end communication testing. We have been able to produce Mithril certificates by relying only on the DMQ for communication between signers and aggregators.
Decentralization of Mithril network configurations
We have worked on the first phase of decentralizing the Mithril network configurations: we have abstracted the retrieval of the network configurations with a new MithrilNetworkConfigurationProvider trait. We have created two implementations of this trait: one that retrieves configurations from the leader aggregator's local parameters, and another that retrieves them from a remote source for follower aggregators and signers. The second phase will consist of implementing a configuration source based on markers stored on the Cardano chain.
Protocol status
The protocol operated smoothly on the release-mainnet network with the following metrics:
- Registered stake:
4.5B₳(21%of the Cardano network) - Registered SPOs:
239(9%of the Cardano network) - Full Cardano database restorations:
590restorations - Signer software adoption:
73.9%of the SPOs are running a recent version (one of the last three releases).
You can find more information on the Mithril protocol insights dashboard.
Hydra
Issues and pull requests closed in October
This month, notable roadmap updates include:
Hydra 1.0!
A big milestone for the team, and a representation of our commitment to Hydra. We are very proud to have gotten to this point, and are super grateful to the large community around Hydra that continues to have a substantial impact on the features we work on. Thanks to everyone involved! Can't wait to continue this journey with you.
Subsequently, we have released Hydra 1.1.0 to bring across some fixes for partial asset deposits.
Demo HTLC
An influx of demos appeared, showing how to transfer funds between Hydra heads:
- From us: https://github.com/cardano-scaling/hydra-lightning-router
- From VTech: https://github.com/Vtechcom/hydra-htlc-demo
- From TxPipe: https://github.com/cardano-scaling/eutxo-l2-interop
Best practice committing from a DApp
We've added a guide for showing how to commit/deposit from a DApp.
Roadmap update
Please bear with us while we refine our roadmap approach.
In brief:
- Continuing work on partial fanout
- Continuing work on a light-weight node via Raspberry Pi.
- Planning next milestones.
Links
The monthly review meeting for October 2025 took place on November 6, 2025, via Google Meet. The presentation slides and the recording are available for review.