4th Edition: Postponed.

50 hours - 150 participants - Netherlands

following the Breaking Bitcoin conference

Build stuff.

Chainhack, the blockchain hackathon is back for a fourth edition! It's the ultimate event for learning/hacking/networking with your peers from the community.

You are an expert or beginner with interest in Bitcoin or other blockchain projects Chainhack is the event you really don't want to miss.

You will have fun building stuff (there will be swag too)

And if you are a newbie, don't panic! some of the best technical experts in the blockchain realm will be there to help you build your project. Come as you are !

This is what will happen

and why you should be there


You will build. Most of your weekend will be spent with your team, hacking a product together. We want projects to be built from scratch, no preformed teams!


Workshops, talks, mentors. No matter your expertise, you will learn something there. Attendees range from newbies to core-devs, everybody here to enjoy.


This is not work. Plenty of time to relax, enjoy a coffee or a pint with amazing people.


Free food, free coffee, a lot of swag to bring home, some cool music, amazing cash prizes... and everything else that makes Chainhack unique.

The process

Here is how it works


  • Find an idea (optional)
  • Get in the pitch queue
  • Grab the mike
  • Present in 30 seconds!

Form a team

  • Talk to the pitchers you like
  • Join your favorite and gather a team
  • Grab a table
  • Get to work!


  • Attend the workshops if you need
  • Use the mentors
  • Don't burn out
  • Enjoy!


Frequently Asked Questions

Where in the Netherlands?

We haven't decided yet.

Can I pay in Bitcoin?

Yes, but few people do. We will put the Pay-With-Bitcoin button here!

Can we compete with an existing product?

No, needs to be built from scratch during the weekend!

Can I come with an existing team?

The whole point is to network and learn. You will be encouraged to mingle and spread in different teams.

Do I need an idea/project to come?

No, idea creation and team formation will be done on-site on the Friday.

How does the team formation work?

Only the best ideas will participate. That means if your idea does not get enough votes on the Friday, you will have to join another team. Why? We don't have enough time for more than 15 pitches on the Sunday.

Who owns the IP/copyright/product?

You! By default, each coder owns her lines of code, that's copyright. We will encourage you to put your work in GPL, MIT, CC or other open source licenses, but that's your call.

Why is there a fee?

To avoid no-shows. It is well worth it though, as we provide the food, drinks, coffee, swag...

Which programming language?

Any! There are APIs to make it simple for you to interact with blockchains without having to learn the core code itself.

Which blockchains? Only Bitcoin?

Any blockchain you want. Not restricted to Bitcoin. We will have mentors to help with most blockchains, including Ethereum.

What are the topics?

Anything you want. Not only Finance, not only commercial ideas.

What are the judging criterias?

This will be explained during the hackathon!

Should I learn anything beforehand?

You don't have to, but reading the Bitcoin developer doc or/and the doc on developing Ethereum smart contracts would help to get started.

I am a beginner. Am I welcome?

Yes! This is an event to learn. Some people will be extremely talented, some just beginners, that's why it will be amazing.

I want to be an observer, not participate. Can I come?

We will have a VIP invite-only list for the presentations on the Sunday. Only participants will be allowed during the Friday and Saturday.

What should I bring?

Your laptop! (I have seen people come empty-handed to hackathons before...)

Where is the hackathon happening, exactly?

The first 2 editions were in Dublin, Ireland. The third edition was in Lisbon, Portugal. The 4th in the Netherlands, somewhere! .

Contact us at [email protected]

© 2015-2019 Chainsmiths