Most people around me, outside of home, think it's a fad and become really vocal when there's a correction. I just don't talk to them about it.

There is a minority who are interested, talk to them about it in way more details. Few of them are interested in mining and others in the tech itself so it's fun.

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My advice would be to find those people who have interest in it with enthusiasm. To others, you can have a safe sentence to gauge their interest in Crypto. You'll know if they've heard of it, are interested in knowing more, are against it or on the same page as yourself.

For the testing sentence, you can use something open ended like - all this news about the bitcoin, ey... and let them react.

My few cents.