Strategy co-founder Michael Saylor has suggested that the U.S. could purchase
20% of the Bitcoin supply “for free,” and that owning 4 to 6 million BTC would
“pay off the entire national debt.”
--Source
What makes you think they want to pay off the national debt?
With the knowledge that money in America is based on debt, it should not come
as a surprise to learn that the Federal Reserve System is not the least
interested in seeing a reduction in debt in this country, regardless of public
utterances to the contrary. Here is the bottom line from the System’s own
publications. The Federal Reserve Bank of Philadelphia says: “A large and
growing number of analysts, on the other hand, now regard the national debt as
something useful, if not an actual blessing…. [They believe] the national debt
need not be reduced at all.”
It is difficult for Americans to come to grips with the
fact that their total money supply is backed by nothing but debt, and it is
even more mind boggling to visualize that, if everyone paid back all that was
borrowed, there would be no money left in existence. That's right, there would
be not one penny in circulation. [...] In short, all money would
disappear
--G. E. Griffin, The Creature from Jekyll Island, 1994.
If you understand the "beautiful symbiosis" that exists between the Federal Reserve and the US government and the role debt plays in that partnership, you understand how delusional is the idea of the US buying 20% of the Bitcoin supply to "pay off national debt". Griffin's explanation will suffice:
The entire function of this machine is to convert debt into money. It's just that simple. First, the Fed takes all the government bonds which the public does not buy and writes a check to Congress in exchange for them. (It acquires other debt obligations as well, but government bonds comprise most of its inventory.) There is no money to back up this check. These fiat dollars are created on the spot for that purpose. By calling those bonds "reserves," the Fed then uses them as the base for creating 9 additional dollars for every dollar created for the bonds themselves. The money created for the bonds is spent by the government, whereas the money created on top of those bonds is the source of all the bank loans made to the nation's businesses and individuals. The result of this process is the same as creating money on a printing press, but the illusion is based on an accounting trick rather than a printing trick. The bottom line is that Congress and the banking cartel have entered into a partnership in which the cartel has the privilege of collecting interest on money which it creates out of nothing, a perpetual override on every American dollar that exists in the world. Congress, on the other hand, has access to unlimited funding without having to tell the voters their taxes are being raised through the process of inflation. If you understand this paragraph, you understand the Federal Reserve System.
Would you kill the goose that lays such beautiful golden eggs? But more importantly, understand this:
Since our money supply, at present at least, is tied to the national debt, to pay off that debt would cause money to disappear. Even to seriously reduce it would cripple the economy. Therefore, as long as the Federal Reserve exists, America will be, must be, in debt. (Griffin)
And any ideas and proposals to use Bitcoin to "pay off the entire national debt" are simply delusional.