Keep it Confidential:
The Sapphire Hackathon

Build the first ever confidential dApp in Solidity, and win prizes. Sapphire, the Confidential EVM ParaTime, allows you to use familiar tools to build confidential smart contracts and dApps.

Date icon

September 14, 2022 – October 21, 2022 (midnight UTC)

(The deadline has been extended by a week)

Prize icon
  • 1ST PLACE: $5000 (IN ROSE)

  • 2ND PLACE: $2500 (IN ROSE)

  • 3RD PLACE: $1500 (IN ROSE)

What is Sapphire?

Sapphire is the first and only confidential EVM-compatible runtime. Sapphire offers Solidity developers a familiar development environment, but with the added benefits of Oasis’ privacy-preserving technology.

Sapphire allows for:

  • Confidential smart contract state, end-to-end encryption, confidential randomness

  • EVM compatibility

  • Easy integration with EVM-based dApps, such as NFTs, Metaverse, crypto gaming and DeFi

  • Scalability — high throughput of transactions

  • Low-cost — 99%+ lower fees than Ethereum


Some ideas for inspiration. We welcome great ideas and applications beyond the following scope:

Applications with
Sensitive Data:

Sapphire lets you bring sensitive data, like health, financial, and personally identifiable info on chain safely.

Confidential DeFi:

MEV-proof DEX, private or undercollateralized lending. 


Many popular Web2 games we know and love have private state or game logic. Sapphire enables bringing more on chain.

Confidential NFTs:

Data-backed NFTs with associated private information to bring NFT utility to the next level.

Decentralized Society and Soulbound tokens:

With DID dApps can verify and whitelist users. Sapphire can be a game changer as dApps can now be built with these benefits without risking users’ privacy. 

DID - Decentralized identity:

Maintaining sensitive information linked with external-facing data has always been challenging for dApps. But with Sapphire, you can build and create privacy-preserving data-backed tokens or Soulbound tokens, a critical pillar for decentralized society.

What to Submit?

  • Provide a short summary of your project, including a description of what it is and how you want to evolve it

  • Provide a link to your code repository for judging and testing. Code must be open sourced.

  • Provide smart contract deployment links

  • Include a video (less than 5 minutes) that shows how your project works and why you built it. Videos must be uploaded to YouTube, Vimeo or a similar site and made public.


Are you looking for other builders to create something groundbreaking together?
We can help!



  • Implementation Quality: Does the project demonstrate high-quality development?

  • Potential Impact: How large an impact could the project have? How many users could the project potentially attract?

  • Innovation: How creative and unique is the project?

  • User Experience: Does the project's design make the user experience easy?

  • Originality: The project must be substantially different from any other app submitted by the same submitter/team/organization and must be the original work of the submitter, be solely owned by the submitter, and not violate the IP rights of any other person or entity.

  • Confidentiality: How well does the dApp utilize confidentiality?



See the tutorial


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Read the documentation


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The Oasis Sapphire ParaTime is currently on testnet. This is an early release.
We’d appreciate everyone’s patience and support at this stage, and through the Hackathon.
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