logoETHGlobal Lisbon




zkBob is a zk-based privacy application that works with the BOB stablecoin. We’ve introduced a new Direct Deposit functionality into zkBob, where BOB can be sent directly from a smart contract on Polygon or Optimism into the privacy pool.


🏆 Best use of zkBob Direct Deposits - $6,000 BOB:

  • 🥇 1st place - $3,000 BOB
  • 🥈 2nd place - $2,000 BOB
  • 🥉 3rd place - $1,000 BOB

🛠️ Open track prize pool - $4,000 BOB

Pool prize to be evenly distributed among all hackathon projects that are willing to:

  • Get familiar with the zkBob application on Polygon or Optimism
  • Create a ZK account and generate a ZK address
  • Present generated ZK address within your dApp OR during a live sponsor judging session


Direct Deposits bounty detailed description:

Direct deposits allow end users, intermediary protocols and smart contracts to make private transfers directly to the receiver zk address. Any EVM-based workflow containing one or more stablecoin transfers might be easily integrated with zkBob direct deposits on the smart contract level, with very little modification required on the UI side.

We want you to use direct deposits to build out use cases where responsible privacy is preferred 🔥

Ideas for implementations

  • Integration within open-source wallets
  • Apps for DAO accounting
  • Browser extension for zkBob
  • Donation/fundraising/tipping apps
  • Privacy for P2P micro-transactions
  • Integration with DEXs/bridges/aggregators

We are also open to novel use cases which make sense for privacy-preserving transactions

Acceptance Criteria

  • Creativity, novelty, usefulness for end users and implementation quality.
  • Importance of zkBob integration to the overall application/product (i.e. is it integral to app functionality, usefulness and purpose or is it an add-on without a lot of added value).
  • Coherent integrations between zkBob and other existing protocols/dApps are appreciated
  • Alignment with the BOB and zkBob ecosystem values of on-chain privacy protection within accepted limits.
  • Incorporate some UI functionality so that users can send BOB privately through a browser or mobile based application.
  • *extra credit will apply to solutions using other zkBob components on top of integration with direct deposits (zkBob SDK libraries, gift cards, compliance tooling, deep smart contract integrations, etc.)


This workshop is happening in-person
Integrating zkBob privacy into DeFi workflows
Time: 06:30 PM WEST – May 12, 2023
Location: 2nd Floor | Workshop Room 3