Slides used during the "Building with Hashi on Gnosis Chain" workshop for the Encode x Gnosis Chain Hackathon in May 2023.

1. Encode x Gnosis Chain Hackathon 2023
Introducing
Hashi

2. Encode x Gnosis Chain Hackathon 2023
Introducing Hashi
● Hashi defines a standard for cross-chain
communication based on additive security
● At its core it’s a Hash Oracle Aggregator
● Goal: Distributing trust for bridges over
multiple distinct implementations
● RAIHO (Redundant Array of Hash Oracles)

3. Encode x Gnosis Chain Hackathon 2023
Why Hashi?
● In 2022 more than $2B in assets
were stolen in various token bridge
exploits.
● Rekt.news leaderboard → 4 of the
top 5 are bridges
● No bridge security mechanism is
100% secure
● All bridge designs have trade-offs

4. Encode x Gnosis Chain Hackathon 2023
Design Principles
● Standardization at the lowest level (hash oracle)
● Diversification on the cross-chain communication
protocol implementations (bridges)
○ No bridge implementation is 100% secure
● Security over latency
○ Can be as fast as its slowest oracle
● Redundancy reduces fragility
○ Functions during outages and exploits

5. Encode x Gnosis Chain Hackathon 2023
Main Components
● Applications (Token Bridge, Governance Bridge, NFT Bridge)
● Hash Aggregation:
○ Hashi (Oracle Aggregator)
○ GiriGiriBashi (Governable oracle aggregator)
○ Oracle Adapters (Talk to various hash oracles)
● Cross-chain messages:
○ Yaho (Message dispatcher)
○ Yaru (Message Executor)
○ Zodiac Module (Cross-chain governance)

6. Encode x Gnosis Chain Hackathon 2023
Architecture Overview

7. Encode x Gnosis Chain Hackathon 2023
What to build with Hashi?
● Additional hash oracle adapters:
○ Particularly interested in ZK bridges
(e.g. SuccintLabs, Dendreth, ZKCollective)
● Contracts for validating storage or event proofs, given a hash
● Alternate versions of GiriGiriBashi
○ Alternate aggregation or governance rules
● Build an end-to-end app on top of Hashi (Token, NFT, or Governance bridge)

8. Encode x Gnosis Chain Hackathon 2023
Resources for Hashi
- Repo: https://github.com/gnosis/hashi
- Already implemented adapters for:
- Gnosis AMB
- Telepathy
- Connext
- Deployed contracts:
- 0x471c90d7802E438F54c4638f9FF3b96223Fd91d7 -- Hashi on goerli
- 0xC303dD953928ef4218F0AB8729049bf33Bdc84C8 -- GiriGiriBashi on goerli
- 0xeFeb149bEAeF362406eC4964AD891C8661396864 -- HeaderStorage on chiado
- 0xf2c4b937EEd174Ae08A84d568144E8B29B852F57 -- AMBHeaderReporter on
chiado
- 0x871ee6f5DF413E83427Cab46E588F8B3E59474F7 -- AMBAdapter on goerli

9. Encode x Gnosis Chain Hackathon 2023
Want To Find Out More?
Documentation: Developers.GnosisChain.com
Developer Resources: github.com/Gnosis-Builders/Resources
Request for Projects: bit.ly/request-for-projects
Developer Tools: Gnosis.Builders/developers
Block Explorer: GnosisScan.io
Become a validator: ValidateGnosis.com
Find us on telegram, twitter, discord etc

10. Encode x Gnosis Chain Hackathon 2023
Thank you. @auryn_macmillan