Where to look for expert counseling for blockchain implementations?

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Nowhere really. Such people are hard to come by and those who know their stuff are gainfully employed or are running their own projects. What do you have in mind?
I am sure enough of us here would like to claim that title, however it truly depends on the type of counseling you are looking for. LinkedIn might be a good start and never underestimate the power of contacting team members on current or past ICO's - a friend of mine launching and ICO was able to build a nice network from just that. Being a rather small(ish) community, many love to help/share knowledge with others.
*an ICO* - too quick on the typing.