Cryptocurrencies are unregulated in the UK. Cryptocurrency profits may be subject to Capital Gains Tax. The value of investments is variable and can go down as well as up.

Bug Bounty

We take security seriously. Our bug bounty program offers Bitcoin rewards to anyone who discovers a new vulnerability in our code.
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Find our flaws

What are we looking for?

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Cross-site scripting

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Cross-site request forgery

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Remote code execution

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Click-jacking

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Code injection

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Leaks of sensitive data

How it works

In order to claim a bug bounty, you must:

  • Discover an entirely unknown vulnerability.
  • Alert us before posting the bug anywhere else – and give us sufficient time to patch the issue.
  • Not use the exploit to steal money or data from CoinJar or its customers. If the exploit requires account access, you must use your own.

If you have any doubts or questions, email us at security@coinjar.com.

Ineligible bounties

We don’t reward bounties for any vulnerabilities not under our direct control. For example:

  • Social engineering
  • Issues requiring physical access to hardware
  • Vulnerabilities in 3rd party software (Ruby, nginx, etc)
  • Denial of Service
  • Usability issues

Report a bug

Please fill out the form below to report an issue. Include as much detail about the exploit as you can and a BTC address for us to send the reward to. Our Security Team will get back to you as soon as possible.
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CoinJar’s Digital Currency and Exchange Services are operated by CoinJar UK Limited, a private limited company registered in England and Wales (company number 8905988). CoinJar UK Limited is registered in the UK by the Financial Conduct Authority as a Cryptoasset Exchange Provider and Custodian Wallet Provider in the United Kingdom under the Money Laundering, Terrorist Financing and Transfer of Funds (Information on the Payer) Regulations 2017, as amended (Firm Reference No. 928767).

Like all investments, cryptoassets carry risk. Due to the potential volatility of the cryptoasset markets, the value of your investments may fall significantly and lead to total loss. Cryptoassets are complex and are unregulated in the UK, and you are unable to access the Financial Service Compensation Scheme or the Financial Ombudsman Service. We use third party banking, safekeeping and payment providers, and the failure of any of these providers could also lead to a loss of your assets. We recommend you obtain financial advice before making a decision to use your credit card to purchase cryptoassets or to invest in cryptoassets. Capital Gains Tax may be payable on profits.

Mastercard® is a registered trademark, and the two circle design is a registered trademark of Mastercard International Incorporated. The CoinJar Card Prepaid Mastercard is issued by EML Money DAC pursuant to licence by Mastercard International Inc. The e-money associated with your card is issued by EML Money DAC, authorised by the Central Bank of Ireland under the European Union (Payment Services) Regulations 2018 (Ref C95957).

This material is general information only and does not consider your objectives, financial situation or needs and you should consider if CoinJar Card is right for you. We recommend you consider the CoinJar Card Terms and Conditions before making any decision to acquire the product.

Apple Pay is a trademark of Apple Inc., registered in the U.S. and other countries. Google Pay is a trademark of Google LLC.

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