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I didn't go to the open house but I did visit them personally before that. I also signed an NDA and was happy to do so because they gave more information out than just about any company currently out there without physical chips.
You can't fault them for that, right now as long as everyone at the open house can agree that the specs they have shown are valid, that this company is a legit company, and that they are still on good standing to deliver when they say they will, what more can you ask for. ...
An ASIC company with zero track record & zero cred holds an open house where people are turned away, and the select few who make it in are made to sign NDAs. I think i got all i need

Edit: An interesting IPO being offered
here by DeadTerra (not to be confused with Cointerra), involving HashFast (not to be confused with Fast Hash). Any comments, considering there's talk of a deal with first HashFast devices going exclusively to DeadTerra?
You can only fit so many people in a building, even you should have the capability to understand this.
They were accepting visits before this "open house" and you could have chosen not to sign an NDA, you would just receive less information.