We no longer have to simply trust large companies to respect and protect our personal data. Push a new era forward by building Blockstack apps that Can't Be Evil. $15,000 in cash prizes and experiences are up for grabs!

Can't Be Evil

Join Blockstack in moving the internet forward! We're looking for developers & entrepreneurs that want to help end data breaches, predatory ad models, and the commoditization & abuse of individuals' digital identities. Enter Part 2 of the 'Can't Be Evil' contest by submitting an app that is private by default, leaves the user in full control of their data, and protects their fundamental digital rights. In other words, submit a Blockstack app and take your first steps into a growing ecosystem that is flipping the status quo on its head.

Early Entry

If you submit by August 8th at 11:45pm EST, we'll give you a $500 cash bonus. You will still be able to continue working on your app until the final August 28th deadline as well!

The $500 bonus will paid after final submission in the contest and after you're app has completed 3 months in the App Mining program.

→ Submit


You can win in up to two categories with a single entry.

Most Creative Use of Lightning: Brought to you by the Casa Founder and CEO, Jeremy Welch will be looking for the most creative use of Lightning in your dapps.

Best App Coded by Female Developer: Judged by Katherine Wu, crypto law thought leader and most recently Director of BD for Messari. She will choose the best app coded by a female or non-binary developer.

Most Delightful: Judged by Ryan Hoover, Founder of Product Hunt, this award will go to the application that provides the most delightful ‘a-ha’ moments to users.


Jeremy Welch, CEO & Founder, Casa Most Creative Use of Lightning Jeremy Welch is the Founder & CEO of Casa, the best personal key system on the planet, and maker of the Sats App. With prior experience in product and engineering at Google, Jeremy’s mission is to give crypto owners full control of their digital assets while minimizing the risks of loss.

Katherine Wu, Crypto Legal Expert, Previously Messari Best Female Made Application Katherine is a passionate player in the crypto industry, specifically where it meets with the worlds of public policy and legal perspective. She was previously the Director of Business Development for Messari, after having done stints at the Securities and Exchange Commission (SEC) and the Bank of China.

Ryan Hoover, Founder, Product Hunt Most Delightful Application Ryan Hoover is the Founder of Product Hunt, the place to discover and launch the next big thing in tech. He is also the Founder and investor of Weekend Fund, an early stage venture fund. Fun fact: Product Hunt went through Y Combinator in Summer 2014, the same batch as Blockstack.

Resources (Get Started!)

We've collected the best getting started resources right here. If you need anything else, please join us on Slack with the button to the right or contact community@blockstack.com, we'd love to help you!


Visit the FAQ



Entering is easy:

  1. Register here on DevPost
  2. Build your app, taking note of the three categories
  3. Finish by submitting your app to App Mining at https://app.co/mining and fully complete registration.

Tip: Learn to build a dapp in less than 60 minutes with the Zero-to-Dapp tutorial


Apps submitted to the Can't Be Evil Contest must also qualify for App Mining, so the submission requirements for that program, as displayed below, must be met. Learn more about App Mining.

Requirements: Your app should integrate Blockstack authentication for logging into your app. Your finished app should be available to the public for use. The application must use a registered domain name and the app should be hosted at a URL belonging to the domain. The app website must use a secured (https) connection.

Hackathon Sponsors


$16,800 in prizes

1st Prize (applies to all categories) (3)

→ $5,000 cash
→ Ongoing App Mining Payments According to Rank
→ Free tickets to the upcoming Blockstack Summit 2019, including round trip airfare and lodging covered by Blockstack.
→ Blockstack Swag Package (includes a backpack, t-shirt, hooded sweatshirt, and stickers).
→ Prize details - https://community.blockstack.org/evil/#prizes

2nd Prize (applies to all categories) (3)

→ $500 cash
→ Ongoing App Mining Payments According to Rank
→ Blockstack Swag Package (includes a backpack, t-shirt, hooded sweatshirt, and stickers).
→ Ongoing App Mining Payments According to Rank
→ Alienware Aurora R7 Gaming PC

→ More details: https://community.blockstack.org/evil/#prizes

3rd Prize (applies to all categories) (3)

→ $100 (awarded via Visa gift card)
→ Ongoing App Mining Payments According to Rank
→ Blockstack Swag Package (includes a backpack, t-shirt, hooded sweatshirt, and stickers).
→ Prize details - https://community.blockstack.org/evil/#prizes

Devpost Achievements

Submitting to this hackathon could earn you:


Katherine Wu

Katherine Wu

Jeremy Welch

Jeremy Welch

Ryan Hoover

Ryan Hoover

Judging Criteria

  • Judging Overview
    Judges will pick the best app submitted to their category by scoring on three criteria from 1-5. Uniqueness and User Experience are shared criteria, the third is unique to the category. More: https://community.blockstack.org/evil-criteria
  • All | Overall User Experience
    Is the app easy to use? Does the interface make sense? Is it easy to get started and setup?
  • All | Uniqueness or Innovation
    Are there other readily available apps that I can accomplish the same result with? Does the app allow the user to accomplish something new? Does the app have a unique or new business model?
  • Category | Lightning - Most Creative Use of Lightning
    Importance of Lightning to the App: Is Lightning a critical component of the app? Does the app use a payment model that would much more difficult or impossible with a traditional payment gateway?
  • Category | Best App Coded by Female Developer
    Was the app created by a female developer or female led team? What are the types of apps you can't live without? What apps do you find yourself using multiple times a day? Which app would have the highest impact on your life if it went away?
  • Category | Most Delightful
    Does the app delight the user with its features and experience? Does it present ‘A-ha’ moments that are exciting to the user? Are these features core to the apps use case?

Questions? Email the hackathon manager

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