Blockchain technology and the emergence of financial technology (FinTech) has aimed to transform the way we see computer systems enable the business. It is also starting to change how society sees technology. Blockchain, and especially crypto-currency, has challenged the average person’s core notions on how business and finance could, and should, operate. Blockchain security is sometimes seen as having addressed confidentiality through encryption, integrity through signing and availability through distributed processing. Non-repudiation is a typical benefit in the use of cryptography as is done in the blockchain, although most crypto-currency implementations allow for pseudo-anonymity, which is the ability to link an action to a specific private key, but not forcing the user to link his or her identity. There are myriad deployment options that affect blockchain security and the security areas mentioned are by no means the complete security picture. This presentation aims to identify the security-related factors that will influence blockchain implementations and serve as a primer for security decision-making for any security professional. This presentation will not aim to address blockchain’s relevance, applicability, transformational capabilities or specific implementation issues or design flaws not directly related to security.