It's not like the dot-com bubble at all and to compare it to such is ignoring all the facts of the dotcom bubble. The basis of the dotcom bubble was investing in companies that had potential based upon no actual income or real value other than imaginary value investors made up. All those internet companies had terrible balance sheets and any value investor would stay away. Bitcoin does have value its used to purchase services such as on here like various services, illict drugs, real world assets and some organizations actually accept bitcoin to buy things. It also has a public ledger showing proof of transactions easily auditable by any organization. They actually are starting to use Blockchain technology to track financial investments on both sides of the contract. I also have no clue what you mean by market cap? Do you mean the total overall value of the entire bitcoin market? In, addition the U.S. national debt is a problem with the U.S. government, not the physical currency the treasury and the federal reserve are different. Also, your point of reference should be based upon debt relative to actual country GDP that's a more reasonable way to look at the debt then just one figure without other points of reference.