Sebastian Nagel | sebastian.nagel@iohk.io

21 June 2023

Monthly review meeting

June 2023

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Report | Recording

HYDRA

HYDRA | June 2023 |

Agenda

• External Commits + Demo

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• Roadmap update

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• Delivered & current features�
• Operating Hydra Nodes�
• Next features�
• Community updates

2

HYDRA | June 2023 |

Demo

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• External commits

3

UPDATE

HYDRA | June 2023 |

Legacy commit using internal wallet

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4

HYDRA | June 2023 |

Commit from external wallet

5

HYDRA | June 2023 |

Roadmap Current - ex ideas

6

https://github.com/orgs/input-output-hk/projects/21/views/7

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HYDRA | June 2023 |

Roadmap Current

7

https://github.com/orgs/input-output-hk/projects/21/views/7

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HYDRA | June 2023 |

Roadmap Previous - ex ideas

8

https://github.com/orgs/input-output-hk/projects/21/views/7

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HYDRA | June 2023 |

Roadmap Previous

9

https://github.com/orgs/input-output-hk/projects/21/views/7

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HYDRA | June 2023 |

Delivered / Current features

• Commit multiple UTxO #774
• Generalization of on-chain scripts
• Removes a previous, artificial limitation
• Risk of committing “too much” as before

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• Commit from external wallet #215
• Mostly done, only commit from scripts is still in review
• No need to send funds to the hydra-node managed key
• Clear separation of fuel and funds -> easier maintenance
• Should allow integration with any wallet

10

HYDRA | June 2023 |

Development: API Revamp

• Light-house projects are driving API demands

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• Recent changes to the Websocket API -> Band-Aid solutions

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• External commits also needed to query (the Cardano tx) -> first HTTP endpoint

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• Separate / authenticate access to some API resources

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• Command Query Responsibility Segregation (CQRS)

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• Also: AsyncAPI does not serve our purposes well -> move to OpenAPI?

11

HYDRA | June 2023 |

Delivered features

• Benchmark performance of a Hydra Head #186
• Established and published a baseline scenario
• Horrible performance on github action runners
• Next step: dedicated runners .. and actual performance improvements!

12

HYDRA | June 2023 |

Next features

• Event source persistence #913
• Direct findings from doing off-chain benchmarks -> biggest bottleneck
• Expected improvement ~ 1 order of magnitude in confirmation time
• Also opens up interesting possibilities for state observation in clients

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• Authenticate network messages #727
• Reduce possibility to denial service of a Head
• No funds at risk, but just killing liveness and forcing to re-initialize

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• ReqSn only sends Transaction IDs #728
• Low-hanging fruit
• Makes L2 protocol more efficient and fair
• Required for batched transactions on L2

13

HYDRA | June 2023 |

Operating Hydra Nodes

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• Continuously operating a Hydra Head on mainnet with hydraw as sample app since March 2023�
• Investigating liveness issues led to improvements on the "ops" aspects of hydra-node
• Reduce the level of redundancy in log messages (#922, #896)
• Add more information on failures (#895)
• Improve version reporting from various tools (node, tui)�
• More work needed down to improve resilience of a layer 2 Hydra network #931 #188

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14

HYDRA | June 2023 |

Community updates

• Hydra for Auctions with MLabs - closing of project
• Yielded multiple github issues for ideas
• Demonstrated how to move scripts from L1 -> L2
• Nice example of establishing crucial state on L1 and achieving scalability through L2�
• Hydra for Payments - progressing nicely, more to share soon�
• Hydra / Mithril talk proposal for Cardano Summit 2023
• We messed up, submission deadline was during June 15 already
• Anyone involved with the events team? Waiting for their response currently.�
• Hydra hackathon on Rare Evo?
• Putting together potential agenda / format
• On-site workshop vs. remote hack-on-challenge before/after?

15

HYDRA | June 2023 |

Repository status

16

Number of commits is still not a good metric

HYDRA | June 2023 |

Repository status

17

Number of commits is still not a good metric

HYDRA | June 2023 |

Sebastian Nagel | sebastian.nagel@iohk.io

Questions & Feedback

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Report | Recording

HYDRA

HYDRA | June 2023 |