The contest is now over. See our blog for winner and prize information.

Capture the Coin is a CTF competition to help promote the field of blockchain security by challenging players in the areas of cryptography, smart contract exploitation, blockchain investigations, wallet malware, and other related topics. We invite you to have some fun learning more about this field and its unique problems by solving puzzles and winning prizes!

The competition will open on August 9 at 10am PST. You can play online and at Defcon’s Blockchain Village. Also join us for the contest kick off talk on August 9 at 11:40am PST.

Get help on Telegram or just email admin [at]

See Awards and Rules page for additional details about the contest.

Thanks to Coinbase for sponsoring the event!

The Coinbase Security deals with the real life ramifications of Blockchain Security on a daily basis. From protocol level attacks to end user targeting campaigns, we work to ensure a safe and open financial system. Come visit Careers page and find out how you can help!