Well, your comment starts off by calling him 'wrong'. That immediately sets a combative tone for the rest of the comment, which would have been perfectly reasonable otherwise.

A lot of times if your tone is unintentionally off you'll get a few initial downvotes but other people will see your intentions and bring you up out of the grey, which is what happened here. You're continuing to get downvoted on other comments because they're contributing to a discussion nobody wants to see, the discussion about the discussion. It's best to just stick to the topic, and treat downvotes and the score in general as the ultimately meaningless internet points that they are. HN prizes the generally high signal-to-noise ratio of the comments.

Also Bitcoin is a political topic, one that will draw lots of people who will downvote you just because they don't agree with you.

This post seems to be getting more than usual upvotes for a comment deep in thread, and I can't edit it anymore, so let me add that I typically will consider deleting the first sentence of every email and comment I unleash on the world. It is often detritus that just doesn't belong there.

Remember, kids: you will be downvoted for saying someone is wrong on HN.