Paper

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Researcher Discovers Serious Vulnerability in Paper Crypto Wallet Site
If you have cryptocurrency in a paper wallet from WalletGenerator.net you'd best pull it off.
Code

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OTC Trade Group: Blockchain Smart Contracts Could Spark Interpretation Challenges
Smart contracts may only see limited real-world applications in the near future, according to a new research paper.
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Avoiding credit card chargebacks
How Credit Card Fraud Sank One Bitcoin Exchange
Credit cards are the easiest way to buy bitcoins, but exchanges that don't handle them properly can be hit by chargebacks. What can they do?
Avoiding credit card chargebacks