# ETHOnline hackathon proposal ### Goal: Work on a single idea that could be built with the Privacy & Scaling explorations project and involve hackathon participants interested in building it. The goal is to create a broader awareness of the projects and hopefully have a useful application or a PoC for potential application built. In the case of not finding any interested participants, we should build the application PoCs ourselves. This is a similar approach to the Rayonism which took place for the ETH Global’s Scaling hackathon (https://rayonism.io/). The goal would be to realise the specified idea and not to focus on winning prizes or integrating as many as sponsors as possible just for the sake of it. ### Approach: Because of the limited amount of time and limited resources (assuming the hackathon is not our main priority), ideally we would focus on a single idea on which we should form a consensus first. After that we should share the idea, the details and a short specification in the ETHOnline hackathon channels if anyone wants to join (I’ve already started sharing the RLN post to a few friends who are enthusiastic and might participate in the hackathon). We could then organise work and focus on building. ### Ideas (Blagoj): #### RLN: - Instant messaging chat library or application PoC (this could potentially help 0xSocial project in the future too https://www.auti.sm/) (https://sugared-hospital-6a3.notion.site/Private-anonymous-spam-resistant-chat-application-using-RLN-and-InterRep-single-merkle-tree-fd58ee5170e44a6aac12780b3ec588b5) - Spam resistant cloudflare PoC (https://sugared-hospital-6a3.notion.site/Website-Spam-Protection-Via-Request-Rate-Limiting-Using-RLN-And-Rich-User-Identities-b3d067e18b4f434b9d2243aeb9eb21ba) - Gossipsub-rln - spam resistant p2p library (https://sugared-hospital-6a3.notion.site/RLN-libp2p-protocol-and-usecases-6c82036957df41c38897bfe38e0cff02) #### Semaphore or RLN: - NFT minting protocol for minting NFTs in private and fair-distribution manner - integrated with InterRep (to be specified better) #### Decentralized journalism (Miha) A platform where people could collaboratively work on the stories. The collaborators would need to use decentralized identity, but could remain anonymous if desired. A reputation system for collaborators would be in place to rank the stories and to give collaborators different permissions (editor, publisher ...). Such a platform would enable: - publishing and editing anonymously but yet with some acknowledged identity - collaboration of people of different profiles and level of experience - enable citizens (only with acknowledged identity to prevent uncivilized comments) to comment the published stories The use case could be some people from Syria telling the story about the conditions in their country and collaborating with some developers to provide data visualizations and some designers to provide the art.
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Private message sharing for ETH2 validators implementation draft

Application variables: rln_identity_commitment - Identity commitment of the ETH2 validator, derived from rln_secret_key rln_secret_key - Secret key of the ETH2 validator, generated specifically for the purpose of joining the private messaging channel. Generated using the Poseidon hash function (not SHA256) validator_public_key - BLS public key of the ETH2 validator, computed from validator_private_key validator_private_key - BLS private key of the ETH2 validator, which is used for signing consensus related transactions for ETH2 bls_signature - a signature generated by the validator_private_key of the ETH2 validator for the rln_identity_commitment (the signed message is the rln_identity_commitment ) Smart contract registry implementation // SPDX-License-Identifier: GPL-3.0

1/28/2022
gossipsub-rln implementation details

Requirements: For active network participants (publishing nodes and propagating nodes): Ethereum full node access Smart contract deployed on a blockchain network (Ethereum mainnet or rollup preferable) for group membership management Description: gossipsub-rln should be implemented as a libp2p protocol, by extending gossipsub-v1.0 and including the security extension from gossipsub-v1.1. Parameters: Besides the protocol parameters enabled by gossipsub, gossipsub-rln should allow the following configuration parameters:

10/27/2021
RLN libp2p protocol and usecases

Variables and conventions: gossipsub-rln - the name of the p2p pubsub protocol RLN - Rate Limiting Nullifier Goals: Provide easy to use p2p PubSub protocol which offers privacy and spam protection on network level Use the protocol as a building block for applications that need strong privacy and spam resilience - implement the identified use cases described below using the protocol Create public awareness of the RLN construct and the gossipsub-rln protocol and what could be built with it (usecase demo)

9/1/2021
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