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Join Us at the BNB Chain Hackathon Istanbul!

2023.10.12  •  10 min read
Blog post image.

Updated: 6 November 2023

Are you ready to dive into the world of blockchain and decentralized applications? We invite you to participate in the BNB Chain Hackathon, Istanbul, taking place from November 10th to November 12th, 2023. This three-day event promises to be an exciting opportunity to explore the limitless possibilities of blockchain technology.

Event Details:

  • Date: November 10-12, 2023 (3 Days)
  • Location: ESA Espor Arena, Maslak, 42 Maslak AVM, Ahi Evran Cd. No:6/70 Kat:3, 34485 Sarıyer/İstanbul, Türkiye
  • Register Now!

About the Hackathon

For this hackathon, we're thrilled to introduce you to opBNB and Greenfield, two cutting-edge blockchain platforms that offer endless possibilities for developers and entrepreneurs.

BNB Greenfield provides decentralized storage infrastructure within the broader BNB Chain ecosystem. The idea is to help users and dApps to create, store, and exchange data with full ownership, and form a new data economy.

The opBNB network is the Layer 2 scaling solution for the BNB Smart Chain, powered by the bedrock version of Optimism OP Stack. It allows users to deposit and withdraw funds, use smart contracts, and view network data with high throughput and low fees, all while scaling beyond the constraints of the BNB Smart Chain.

Hackathon Requirements

We encourage you to develop in line with our Wishlist, which includes exciting tracks in both Greenfield and opBNB. Each track offers exciting challenges and opportunities for innovation. You can view the details list at the bottom of this announcement. 

Key Dates



  • Registration opens

  • Announcement of BNB Chain Wishlist

  • Developers whose application has been accepted can start hacking according to the wishlist.

During Hackathon


  • Workshop

  • Hacking

  • Project Feedback Session


  • Hacking continues

  • Submission

  • Project Feedback Session


  • Submission ends

  • Assessment of projects

  • Finalists Notified

  • Closing Ceremonies


We're offering up to $100k in rewards for your hard work and innovation:

• 1st Prize: $15k
• 2nd Prize: $10k
• 3rd Prize: $5k

Plus, up to 70k in additional rewards across a variety of categories.

The event organizer, in its sole discretion, may award an additional reward of up to $2,000 USD per project based on the quality of the project. Up to a maximum of $70,000 USD of additional rewards will be awarded.

The Rules of the Competition

Please read and follow the competition rules to ensure a fair and enjoyable experience for all participants. These rules cover eligibility, participation requests, and conduct during the event.

Submission Requirements

  • Work must be deployed on or connected to GF/opBNB in some way.
  • Work that is open source and free for others to use.
  • Shared artifacts (GitHub, planning documents, and a short video).
  • Ensure the contract address has at least 2 successful transactions within the hackathon timeframe.
  • Tweet describing your project and tag #buildonBNBChain
  • For this hackathon, the project must be a new development in order to ensure equal opportunity

Please note that you do not need to pitch your idea to us. All we need is your submission.

Projects will be evaluated based on 1) functional prototype highlighting a solution, 2) creativity, 3) readiness of the dApp and 4) usability. 

The Spirit of the Competition

Remember, hackathons are about learning, collaborating, and having fun. While some aim to win, most are here to explore new ideas. Keep the hacker spirit alive by working with other teams, mentoring newcomers, and enjoying yourself.

Join us in Istanbul for the BNB Chain Hackathon Istanbul, where innovation knows no bounds, and the future of blockchain technology is in your hands. Together, let's push the boundaries of what's possible and shape the future of finance and data management.

For more details, view the full rules of the competition at the bottom of this article. 

Register now and see you at the hackathon!

BNB Chain Wishlist

New Data Economy on Greenfield Infrastructure Tracks

    • Leveraging BNB Greenfield for L1 Data Storage
    • Self-host Solution for BNB Greenfield Storage Provider
    • Empowering Greenfield with Advanced Analytics Support
    • Light-weight storage provider
    • Greenfield CDN
    • Publishing Platform on BNB Greenfield
    • Content Sharing Platform BNB Greenfield
    • Knowledge Sharing Platform BNB Greenfield
    • Personal Data Marketplace BNB Greenfield
    • Blockchain of Things(BoT) BNB Greenfield
    • Decentralized AI Training - AI Labeling on BNB Greenfield
    • Data Driven API and Services on BNB Greenfield
    • Trustless Notary on BNB Greenfield

Dapp Tracks(Goals and Description

Infrastructure Tracks(Goals and Description

Mass Adoption Infra, Tooling, and Dapp on BNBChain

    • Bridging L2 Networks for Seamless Cross-Chain Activity
    • opBNB Data Availability Layer on Greenfield
    • Empowering opBNB with Advanced Analytics Support
    • Accelerating opBNB Node Synchronization
    • Long Term Archive Service Support
    • Fair MEV Infrastructure Enhancement
    • Alternative clients for opBNB
    • BNB Smart Chain Consensus Enhancement to encourage fair plan of validators and stabilization of blocks
    • BNB Chain governance enhancement
    • Accelerating Blockchain Node Synchronization
    • Long Term Archive Service Support
    • Fair MEV Infrastructure Enhancement
    • Alternative clients for BNB Smart Chain
    • Privacy Protection Transactions Protect
    • Stateless on BSC
    • ZK-based Data exchange
    • opBNB On-chain Identity
    • opBNB On-chain Game
    • Decentralized Social Network
    • Perp Dex on opBNB
    • Stable Coin Payment for opBNB

Dapp Tracks on  opBNB(Goals and Description

Infrastructure Tracks on BNB Smart Chain(Goals and Description

Infrastructure Tracks on opbnb(Goals and Description

Other tracks

BNB Chain Istanbul track info:

The Hackathon has a number of diverse yet interconnected tracks. Each track is designed to push the boundaries of innovation.

Whether you are a newcomer to the blockchain space or an experienced developer, we have designed these tracks to challenge, inspire, and uplift your skills. Each track has its own specific focus, but all aim to encourage you to explore, innovate, and create real-world solutions harnessing blockchain technology.

Below you will information on all tracks provided by BNB Chain, Space ID and Polyhedra!

BNB Chain Tracks

1. BNB Smart Chain for all ( infra/dapp wishlist of bsc); 

2. Powering Next-gen dAppson opBNB ( infra/dapp wishlist of opBNB); 

3. New Data Economy on Greenfield( infra/dapp wishlist of Greenfield.)

Supporting info: Please view our wishlist for more information on topics

Space ID Track

Name: Novel Use Cases for SPACE ID Domains

Description: Interesting projects integrating  SPACE ID, or projects that explore innovative ideas using SPACE ID. Potential ideas include but are not limited to cross-chain resolution, decentralized messaging, new types of resolvers, and account management systems.


Hackers can use the following resources to learn about SPACE ID:

1. SPACE ID SDK Documentation

2. EIP 3668 - Secure Offchain Data Retrieval

3. SPACE ID Tutorials

Polyhedra Track

Name: Decentrailsed ID


opBNB provides a great solution for widespread adoption across multiple digital environments such as games, social networks, the metaverse, and high-frequency trading. 

zkBridge provides the most secure design for general message passing and asset bridging between various L1 and L2 networks. The end-to-end system for zkBridge fast finality on opBNB ( a smooth cross-chain user experience with the high-security and low-latency zkBridge on opBNB.

In our track, we will instruct you to build on opBNB and explore the use case of zkBridge on opBNB.Resources:

Task 1:

In this scenario, we have a computational task denoted as 'f' that accepts an input 'x' and produces an output 'y'. Below, you'll find the interface for this computation task, as defined in Solidity:


// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

interface ComputationTask {

    // This function carries out the computation task.

    // It takes an input parameter 'x' and returns an output 'y'.

    function compute(uint256 x) external returns (uint256 y);



On opBNB, the computation is executed optimistically, meaning there's no assurance that the computation will be performed correctly within the stipulated challenge period. To address this, we've introduced a committee responsible for executing the computation accurately. Committee members are required to provide their signature only if they confirm that the output 'y' is correct.

However, some committee members may exhibit laziness, choosing not to rigorously verify the computation. These "lazy" members might opt to request other committee members to supply the correct 'y' and then simply affix their signatures to it. Alternatively, they may blindly endorse whatever output obBNB generates.

Your task is to devise a mechanism capable of identifying and flagging these lazy committee members.

Task 2:

Computation on the L1 Blockchain is excessively costly. For instance, consider the following computationally expensive task:


// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

interface ComputationTask {

    // This function performs the computation task.

    // It takes an input parameter 'x' and returns an output 'y'.

    function compute(uint256 x) external returns (uint256 y);



Executing the `compute(x)` function incurs a gas cost of approximately 1,000,000 gas.

Thankfully, opBNB provides a much more cost-effective platform for conducting such computations. Your objective is to delegate the computation from BSC to opBNB and then transfer the final result back to BSC via the Polyhedra Bridge.

It's worth noting that you can assume the client will request this computation every 10 seconds, offering the opportunity to batch transfer computation results to further reduce the cost.

Task 3:

On-chain random numbers are crucial for gaming applications. We deployed a verifiable random function on opBNB, and it’s now waiting for applications to use it. We provides following off-chain RPC calls and on-chain verification method:

  1. RPC:
    1. Register a service: 

VRFKey = await rpcCall("register");

It provides you a VRFKey that can be used in verifying the random number.

  1. Get randomness:

randomness, proof = await rpcCall("register");

  1. On-chain
    1. Register a service:


// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

interface VRF {

    // This function performs the computation task.

    // It takes an input parameter 'x' and returns an output 'y'.

    function register(address applicationAddress, uint256 VRFKey) external returns (bool result);



This function associates your VRF key with your dApp.

  1. Verify:


// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

interface VRF {

    // This function performs the computation task.

    // It takes an input parameter 'x' and returns an output 'y'.

    function verify(address applicationAddress, uint256 randomness, uint256 proof) external returns (bool result);



This verifies the randomness is correctly generated against the proof.

You are allowed to freely use these interfaces. Now it’s your time to develop a fantastic application.

Open Campus Track

Name: Decentrailsed ID

Description: Develop a decentralized identity system on opBNB. Utilize its infrastructure to implement on-chain reputation scoring and DID credentials verification. Focus on leveraging DID for transparent and secure identity management and authentication, eliminating intermediaries and prioritizing data privacy.


- New applications using DID beyond existing use cases

- Privacy focused on-chain credential and ID verification

- Accessible UX for the masses

- Reputation based scoring using DID

Competition Rules - Further details

1. Eligibility:

Team Size:Teams may have a maximum of 5 hackers.

2. Participants Requests:

 Hackers who have been accepted to compete on a team must not be event staff, volunteers, mentors, judges, sponsors, or anyone else with special access to the competition.

Participants, including organizers, volunteers, and sponsors, are available to offer teams guidance and assistance.

4.The hackathon is the only place where work can be done on a project.

5. Groups are allowed to implement a strategy they developed in advance of the competition.

6. Teams have the option of focusing on already completed ideas. There is no requirement for "innovation" in hacks. Anyone is welcome to contribute to a shared idea, and their work will be evaluated based on how well it is "hacked." (It's unusual to come across something wholly novel these days, and teams often aren't aware if they're recycling a concept.)

7. Groups are free to include third-party resources, such as code repositories, into their work. It is against the spirit of the guidelines to work on a project ahead of time and open-source it with the sole intention of using the code during the event.

8. It is acceptable to include additional functionality into ongoing projects. Winners will be determined solely based on the value of any new features or functionalities introduced during the hackathon.

9. When the clock runs out, teams must cease their hacking activities. After the allotted time has passed, however, teams are free to debug and make minor adjustments to their applications. e.g. It's acceptable to fix a bug that prevents you from demonstrating your hack if doing so involves adding only a few lines of code. You are not permitted to make any major alterations or introduce any new functionality.

10. Teams can be disqualified from the competition at the organizers' discretion. Reasons might include but are not limited to breaking the Competition Rules, breaking the Code of Conduct, or other unsporting behaviour.

Submission Requirements

When the hackathon is over, the teams will upload their finished products to Github for evaluation.


Participant/Team Name


Project Name


Brief description of your project (One Paragraph - 500 Words)


Country / Region


Technical Solution your dApp is based on?


Which track best describes your dApp?


Your project's GitHub Repository URL


Presentation Deck


Deployed Smart Contract Address


Deployed to Any other Chain Yes/No


Participated in any previous hackathon with the same idea

Judges will review all submissions and winners will be announced on Sunday 12th November  

Teams can choose to participate in as many relevant sponsor categories as they like.

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  1. The maximum prize pool for this hackathon is $100,000 USD and consists of: $15,000 USD for first prize; $10,000 USD for second prize; $5,000 USD for third prize; and up to $70,000 in additional rewards.
  2. Additional rewards will be awarded at the sole discretion of the event organizer based on the quality of the projects produced. The BNB chain core team reserves the right to disqualify any participants who, in its reasonable opinion, are acting fraudulently or not in accordance with any applicable terms and conditions.
  3. The BNB chain core team reserves the right to disqualify trades that are deemed to be wash trades or illegal bulk account registrations, as well as trades that display attributes of self-dealing or market manipulation.
  4. The BNB chain core team reserves the right at any time in its sole and absolute discretion to determine and/or amend or vary these terms and conditions without prior notice, including but not limited to canceling, extending, terminating or suspending this promotion, the eligibility terms and criteria, the selection and number of winners, and the timing of any action to be taken. All participants shall be bound by these amendments.
  5. Where any discrepancy arises between the translated versions and the original English version, the English version shall prevail.