My take on this one is that if you've got a lot of spare money and you want to get into this, it's just all about satisfaction and getting the certificate unless you want to apply for jobs related to Bitcoin and related to blockchain technology.
Two questions come to mind here. First is whether companies hiring "blockchain experts" require such certificates or care if you have one or not. Second is whether these hiring companies even recognize the issuer of such certificates!
I haven't really looked for the jobs in this industry but from what I've seen from startups and other small businesses in this field, the experts themselves create these small companies and then they hire regular programmers, etc. to help build the business.
Not to mention that when anybody hires employees, they look for experience not certificates. For example when they hire a programmer, they don't ask them who taught them c++. Instead they ask them how many lines of c++ they have written and what programs they've created, and stuff like that.