ZK Hack Berlin

DEFAULT

Top Sponsors

Based Sponsors

Irreducible

Aleo

Community Sponsors

Boundless

Aztec

Horizen

Hyli

Arbitrum

ZKPassport

Gnosis

Xion

Self Protocol by Celo

Self

ZKValidator

Media Partners

ZeroKnowledge Podcast

ZK Podcast

Founder

Anna Rose

Celo

President

Rene Reinsberg

Celestia

Connor

Osmosis

Co-Founder

Secretary

Lisa Akselrod

Co-founder & CEO

Sylve Chevet

Binary Builders

Marko

Théo Madzou

Anoma

Researcher

Yulia

Miden

Gaylord Warner

Evi / TranquilFlow

Software Engineer

Zeng Huy Tay

Interchain Foundation

Product Manager

Susannah Evans

Ethereal Ventures

Partner

Praneeth Srikanti

Jim Posen

Christy Cui

Sasha Aldrick

Milica Vulic

Rafi

Savio Sou

Josh Crites

Michael Elliott

Daniel Lumi

Chris Cordle

Lena Hierzi

Chromion: A Chainlink Hackathon

Coinbase Agents in Action Hackathon

Hack4Brahmaputra

Hacking Paris  | Powered by Chiliz

Thanks to our Prize Partner ZKV, the best projects (aka Top 3) will share a prize amount of $5,500.

ZK Hack Berlin Winners

ZK Hack Berlin Grand Winner

ZK Hack Berlin 2nd Place

ZK Hack Berlin 3rd Place

Chewing Glass

Hackers Choice

**Description:**
The bounty is to add Blake3 compression as an extension instruction for the PetraVM. This involves writing a Binius M3 table for verifying the Blake3 compression function and integrating this into the PetraVM emulator and assembler, so that Petra assembly programs can invoke the instruction.

The instruction format should be modeled after the Grøstl hash compression instruction.

**Requirements:**
Petra assembly programs written with calls to the Blake3 compression execute successfully. The M3 constraints for Blake3 must be secure and properly constrained.

Blake3 Instruction for PetraVM

Best Project

**Description:**
The bounty is to build a Binius M3 gadget for multiplication of integers modulo a 256-bit prime.

**Requirements:**
The gadget must be tested and correct for multiplications modulo the prime that defines the P-256 curve base field. The code must be submitted to the Binius open source repository.

256-bit Prime Mod Multiplication in M3

**Description:**
Whether it's anonymous casino, anonymous betting, or arcade games, we want to see creativity and fun built on Aleo!

**Requirements:**
- Submission Components: Complete project that includes GitHub repository and a README file. Video demo/walkthrough.

- Novelty Requirement: Duplicate or copied projects will be disqualified.

- Team Composition: Open to individuals or teams. All team members must meet the eligibility criteria if participating as a team.

- No Pre-Built Solutions: Eligible projects must be built during the hackathon only to ensure fairness.

Best anonymous game built on Aleo

**Description:**
DEXes, lending markets, privacy-preserving order book, private prediction markets, launch pads, you name it!

**Requirements:**
- Submission Components: Complete project that includes GitHub repository and a README file. Video demo/walkthrough.

- Novelty Requirement: Duplicate or copied projects will be disqualified.

- Team Composition: Open to individuals or teams. All team members must meet the eligibility criteria if participating as a team.

- No Pre-Built Solutions: Eligible projects must be built during the hackathon only to ensure fairness.

Best privacy-preserving Defi app on Aleo

**Description:**
Verify and authenticate using location, time, storage, socials, email, scores, actions etc. Pick your poison!

**Requirements:**
- Submission Components: Complete project that includes GitHub repository and a README file. Video demo/walkthrough.

- Novelty Requirement: Duplicate or copied projects will be disqualified.

- Team Composition: Open to individuals or teams. All team members must meet the eligibility criteria if participating as a team.

- No Pre-Built Solutions: Eligible projects must be built during the hackathon only to ensure fairness.

Best privacy-preserving authentication protocol on Aleo

**Description:**
This co-bounty, in collaboration with Hyli, asks participants to build innovative applications on the Hyli testnet leveraging Boundless for proof generation.

**Requirements:**
Participants can choose to pursue one of two distinct challenges, each with a prize of $500:

- Deploy an application on the Hyli testnet using Boundless for proof generation: Projects must clearly utilize both Boundless and Hyli in its architecture or functionality.

- Build a ZK-hyperliquid on Hyli using Boundless for proof generation: Projects should demonstrate how zero-knowledge proofs can enhance a hyperliquid-like system, integrated with Hyli and Boundless.

Boundless + Hyli

**Description:**
This bounty is for hackers building using Boundless. We're seeking projects that demonstrate novel use cases, robust implementations, and showcase the capabilities of Boundless in various applications. Any valid use of Boundless for proof generation counts. 

Up to three chosen projects that meet the criteria and sufficiently utilize Boundless will be awarded $500 each.

**Requirements:**
Develop and submit a functional project that incorporates Boundless as a core component for proof generation. The project should:

- Clearly demonstrate a significant and integrated use of Boundless.

- Be well-documented, explaining the project's purpose, architecture, and how Boundless is employed.

- Provide a clear demonstration of its functionality (e.g., live demo, video, or detailed steps to reproduce).

Build with Boundless

Selected Project 1

Selected Project 2

Selected Project 3

**Description:**
This bounty is awarded to the project that best demonstrates the comprehensive capabilities of the Aztec testnet. We are looking for innovative, robust, and well-executed applications that leverage Aztec's privacy features (e.g., private smart contracts, shielded transactions) to solve real-world problems or create novel experiences. The project should showcase strong technical implementation, a clear value proposition, and a compelling user experience (if applicable).

**Requirements:**
- Project must be built primarily on the Aztec testnet.
- Must utilize Aztec's privacy-preserving features (e.g., private state, private functions, Noir).
- A clear demonstration of functionality (e.g., live demo, video walkthrough).
- Well-documented codebase (e.g., GitHub repository with README, installation instructions).
- Submission should include a brief presentation or pitch deck explaining the project's purpose, architecture, and features.

Grand Prize: Best Overall Aztec Testnet Project

**Description:**
This bounty recognizes a project that stands out for its exceptional technical depth or its highly innovative approach to utilizing the Aztec testnet. We're looking for solutions that creatively apply Aztec's features, demonstrating a deep understanding of its capabilities, or introduce a truly novel concept that leverages privacy. This could be a complex protocol, a unique privacy-preserving mechanism, or a highly optimized solution.

**Requirements:**
- Project must be built on the Aztec testnet.
- Demonstrates a high level of technical sophistication or a highly original application of Aztec's privacy features.
- Working prototype or functional code.
- Source code available in a public repository.
- Explanation of the innovative aspect or technical challenges overcome.

Most Innovative or Technically Proficient Aztec Integration

**Description:**
This bounty is for projects that excel in a specific area of the Aztec ecosystem. This could be:
- A dApp that leverages Noir for a unique private state management solution.
- A tool that significantly improves the developer experience for building on Aztec (e.g., a testing framework, a debugger, an SDK extension, a contract wizard).
- An exemplary integration demonstrating a specific Aztec feature in a compelling way. The goal is to showcase the versatility and power of Aztec's individual components.

**Requirements:**
- Project must be built on the Aztec testnet or directly support development on Aztec.
- Clear focus on showcasing or improving a specific Aztec feature or developer workflow.
- Functional code or demonstrable utility.
- Public GitHub repository.
- Explanation of which specific Aztec feature is highlighted or how the tool enhances the developer experience.

Best Use of Aztec Feature or Developer Tooling

**Description:**
This grant is awarded to a promising project that demonstrated significant effort, a solid understanding of the Aztec testnet, and a creative approach, even if it didn't secure a top-tier prize. We're looking for well-intentioned and well-executed ideas that show potential for future development within the Aztec ecosystem.

**Requirements:**
- Project must be built on the Aztec testnet.
- Demonstrates a clear concept and effort in implementation.
- Basic functionality demonstrated.
- Submission of code and brief project description.

"Builder's Choice" Grant

Grants

**Description:**
Develop a zkApp using Relayer on Horizen

**Requirements:**
- Projects must be created by the team or individual submitting them.
- Code must be written during the hackathon. No prior submissions or reused projects allowed.
- Projects may not include code under non-permissive licences
- Forking previous work is allowed only if significantly adapted for use with the zkVerify Relayer.
- A clear commit history during the hackathon period is required.

- Relayer Integration:
Projects must integrate the zkVerify Relayer for ZK proof verification.
Any of the verifiers listed at zkverify.io/supported_proofs may be used.


- The zkApp must be deployed on Horizen.
The smart contract should interact with the zkVerifyAttestation contract deployed on-chain to verify proof correctness.

- Functional Requirements
Your zkApp should demonstrate one of the following:
Preferred Option - Abstracted UX:
Users interact only with the zkApp frontend.
End users should not need to hold funds.

- The backend must handle:
Submitting ZK proofs to the Relayer.
Listening for and processing events emitted after successful verification.

- Alternative:
A functional zkApp where Relayer is clearly integrated, even if not fully abstracted for the end user.

- Submission:
Code must be submitted via a public GitHub repo.
Include a clear README.md with the following:
How to set up and run the zkApp.
Explanation of the ZK use case.
Team member names and backgrounds.

- (Optional) Architectural diagram showing integration with zkVerify and Relayer.

The most innovative zkApp using Relayer

**Description:**
Build a zk-powered application on the Hyli testnet using Boundless and/or Risc0, from privacy-preserving identity apps to zk-hyperliquid protocol.

**The project must:**
- Successfully deploy a working application on the Hyli testnet.
- Use Boundless to integrate smart contract logic that leverages ZK proofs AND/OR use Risc0 to generate and verify zero-knowledge proofs as part of the application’s flow.
- Demonstrate at least one meaningful interaction or user flow that involves proof generation & verification.
- Showcase an innovative or useful application of Hyli’s capabilities.

Hyli + Boundless

**Description:**
Leverage ZKPassport SDK to do conditioned token transfers thanks to Hyli

**The project must:**
The project uses the ZKPassport SDK and verifies the resulting proof on Hyli to build one of the following:
- A token that can only be transferred to people of another nationality than you
- A token that can only be traded if you're over 18 (or under 25 for proof of zoomer)
- A token with transfers conditioned on any other kind of attributes/conditions derivable from ZKPassport proofs: be creative!

Hyli + ZKPassport

**Description:**
Deploy your own application on the Hyli testnet and explore what’s possible on top of Hyli’s modular, scalable architecture.


**The project must:**
- Successfully deploy a live application on the Hyli testnet.
- Use Hyli-native contracts and tooling.
- Be original/creative or meaningfully extend existing concepts.

Deploy an application on the Hyli testnet

**Description:**
Build a zero-knowledge application that solves a real-world problem, demonstrates clear product-market fit, and is deployed exclusively to an Arbitrum testnet. Your app should show signs of being something users would adopt or pay for. We are looking for ZK-based use cases that are ready to be used today or have strong potential to be deployed to mainnet soon. You can use any ZK proving system or tooling, but we strongly encourage building with Arbitrum Stylus in Rust.

**Requirements:**
- Must be deployed to an Arbitrum testnet.
- Must use zero-knowledge proofs as a core component of the application logic
- Must solve a real user problem and demonstrate product-market fit (examples: identity, data privacy, private DeFi, selective disclosure)
- Must include a clear README with instructions for how to run and test the app
- Teams must submit a short video walkthrough of the app and how it works
- Bonus points for using Stylus with Rust for either the ZK verifier or app logic

Best ZK App with Product-Market Fit

**Description:**
Build a zero-knowledge application that intentionally has no clear product-market fit. Think experimental, fun, strange, or technically ambitious. This bounty rewards projects that push the boundaries of what’s possible with ZK, even if they have no current users or business case. Your app must be deployed to an Arbitrum testnet and should showcase creative use of ZK proofs. We encourage you to go wild, try something new, and surprise us. Bonus points if you use Stylus and Rust.

**Requirements:**
- Must be deployed to an Arbitrum testnet
- Must use zero-knowledge proofs in a core part of the application
- Must be creative and out of the box
- Must include a clear README and instructions to test the app
- Teams must submit a short video walkthrough of the app and what makes it intentionally not viable, creative or absurd
- Bonus points for using Stylus with Rust for either the ZK verifier or app logic

Best ZK app with No Product-Market Fit

**Description:**
Arbitrum has a Multi-VM architecture: WASM is deployed alongside EVM. Arbitrum Stylus allows you to deploy Rust & C smart contracts with seamless interoperability with the EVM. Stylus offers much cheaper ZK proof verification, and these verifiers can be called by any EVM or WASM contract. Implement a zero-knowledge proof verifier in Rust for use on Arbitrum Stylus. Your contract should be written using the Stylus Rust SDK and deployed to a supported Arbitrum testnet. You may choose any proving system, but the verifier must be usable as a standalone contract by other developers. The goal is to expand the ecosystem of ZK tooling on Stylus and make it easier to integrate onchain proof verification into Rust-based Arbitrum apps.

**Requirements:**
- Verifier must be implemented using the Arbitrum Stylus Rust SDK
- Must be deployed to a live Arbitrum Stylus testnet
- Must include a sample circuit and a working proof to test the verifier
- Must include documentation for usage and integration
- Code should be modular and reusable by other Arbitrum applications
- Teams must submit a video demo showing the verifier working with a proof

Build a ZK Verifier in Rust for Stylus

Use the ZKPassport SDK to verify user identity—privately, securely, and without leaking sensitive personal information.

Whether you’re building in a Web2 flow or fully onchain with our EVM verifier on Sepolia, let your creativity flow and build the most original and amazing project you can think of.

**Project ideas to get you started:**

- **ZK Captcha** – Prevent spam and bots with proof of uniqueness using ZKPassport’s unique identifier.
- **Age Gating** – Restrict access to 18+ content or offer age-based discounts (e.g. 18–25) without revealing full DOB.
- **Decentralised Verified Name Badge** – A portable proof of first + last name that can be used on decentralised social media platforms to prove you are who your profile says you are.
- **Country Feedback Board** – Let users [post feedback](https://onlyinportugal.com/) about their country—the good and the bad—after proving citizenship or residency via passport, national ID, or residency card. Think OnlyInPortugal.com but verified.
- **Gated Group Chat** – Create gated group chats based on verified credentials like country, first name, gender etc.
- **Global Map Contest** – Build a real-time map and country leaderboard showing how many users from each country have submitted a valid proof of country
Bonus: Get other hackers at ZK Hack to boost your leaderboard.

Let your creativity flow—we’ll be judging the most original and impactful use of ZKPassport.

**Requirements**:
- The project uses the ZKPassport SDK.

**Note:**
- The prize can be awarded to 1 or 2 teams (divided evenly between the two in the latter case), at our discretion

Private Identity Verification

**Description**:
Leverage ZKPassport SDK to do conditioned token transfers thanks to Hyli

**Requirements**:
The project uses the ZKPassport SDK and verifies the resulting proof on Hyli to build one of the following:

- A token that can only be transferred to people of another nationality than you
- A token that can only be traded if you're over 18 (or under 25 for proof of zoomer)
- A token with transfers conditioned on any other kind of attributes/conditions derivable from ZKPassport proofs: be creative!

ZKPassport + Hyli

**Description:**
ZK and other cryptographic research is going to usher in an age of consumer applications and use cases. Let's see products and experiments which aim to reach wide user-bases of non-technical users, on commodity devices. 

**Requirements:**
The application needs to be designed for and appeal to users who are not familiar with blockchains/cryptocurrencies/etc. Assume the audience is non-technical, but familiar with general internet and app usage.

Consumer ZK Apps

**Description:**
Integrate Self onchain SDK into your application so users can prove their identity!
Check the docs linked below to understand how to integrate the Self SDK into your Smart Contract.

Basic Integration: https://docs.self.xyz/contract-integration/basic-integration
Example: https://docs.self.xyz/contract-integration/airdrop-example

**Requirements:**
To be eligible projects must:
implement Self onchain SDK (right now only on Celo mainnet and testnet)
proof needs to work

🏆 Best Self onchain SDK Integration

**Description:**
Integrate Self offchain SDK into your application so users can prove their identity!
Check out the Quickstart to see how quickly you can implement the Self SDK into your dApp.

**Requirements:**
To be eligible, projects must:
implement Self offchain SDK proof needs to work

💻 Best Self offchain SDK Integration

ZK Hack Berlin

ZK Hack Berlin

$45,499

Available in Prizes

$45,499

Available in Prizes

Speakers & Judges

Speakers & Judges

Sponsors

Sponsors

Sponsors

Sponsors

FAQs

FAQs