SC 2 ISO/WD 24374 Information technology — Security techniques — DLT and Blockchain for Financial Services.    The objective is to produce an International Standard for security of DLT (including blockchain) over the course of 36 months that began in September 2019.  Public-Key Infrastructure (PKI) is the cornerstone technology that facilitates secure information exchange over the Internet. However, PKI is exposed to risks due to potential failures of Certificate Authorities (CAs) that may be used to issue unauthorized certificates for end-users. Many recent breaches show that if a CA is compromised, the security of the corresponding end-users will be in risk. As an emerging solution, DLT technology potentially resolves the problems of traditional PKI systems - in particular, elimination of single point-of-failure and rapid reaction to CAs shortcomings. Further, DLT has the ability to store and manage digital certificates within a public and immutable ledger, resulting in a fully traceable history log.