NoSQL databases are a solution to a wide range of niche applications that for the most part didn't exist a decade ago. However, Bitcoin is a revolutionary new business model built on top of what should be a traditional stock trading database, so the concepts of ACID proof transactional processing should still be applied. What's going on is that these NoSQL database vendors are seeking venture capital, so the movement is steeped in kool-aid and guerrilla marketing. A lot of organizations are getting led down the proverbial primrose path.