Your “lawyer” may know 40 people who claim to be soveriegn citizens. So?
Claiming to be a soveriegn citizen means nothing. If you live in the United States you are still subject to the laws of the United States whether you are a citizen or not. If you live within the boundaries of the United States you still have to pay taxes and obey the laws whether you’re an American or a Canadian or a Martian. People aren’t allowed to attack Candadians on the streets. Canadians can be arrested. The notion that only citizens of the United States are subject to the laws of the United States is nonsense. Everyone within the boundaries of the United States is subject to the laws of the United States, except for a few diplomatic personnel.
It is possible to renounce your American Citizenship, but you can’t stay in the United States afterward. In fact, you can generally only renounce your citizenship if you’re allready overseas, because only American citizens have the right to live in America, other people have to have permission to do so. So if you’re not a citizen of the United States and you don’t have a green card, you’ll get deported. Except if you’re stateless, there’s nowhere to deport you to. So that’s why you can’t just walk into your local courthouse and renounce your American citizenship.
Or slightly more precisely, you CAN, it’s just that nobody will pay any attention to you if you do. You can get up and swear on a stack of Bibles and sign any number of declarations, but you’re just going to be treated like a kook who claims he’s Napoleon. That is, you’ll be ignored, until you break the laws of the United States or don’t pay your taxes. Then the IRS and the cops will come after you.
And of course our money isn’t backed by anything except the government. This is called fiat money, and it’s not exactly a secret that we don’t use gold coins or cacao beans or pieces of paper that the government promises to exchange for gold or silver. No, we use fiat money that is intrinsically worth nothing, it’s only value is that other people will accept it in exchange for goods and services, and the only reason they do that is that they know that still other people will accept that money in exchange for goods and services. If people stopped accepting fiat money in exchange for goods and services then that money would be worthless.
Anyway, fiat money is much more honest that “gold standard” money. Back when we were on the gold standard, all that meant is that the government utterly controlled the market for gold. It was illegal to own gold, for crying out loud. And the first thing that happened whenever the government got in trouble due to a war or a depression was that they’d “suspend” gold payments. But nowadays, you can walk into any coin shop and exchange your worthless fiat dollars for real gold. Not a piece of paper with some words written on it that say you’re entitled to such-and-such amount of gold, but actual gold. And you can take that gold and exhange it for goods and services, only accept gold from people that you provide goods and services for.
As for “Accepted for Value”, you can sometimes discharge debts from a debt collector for a fraction of the original debt. But you can’t do this by a magic formula, you do this by negotiation with the debt collector. They say you owe an amount, you offer to pay a smaller amount, and they either accept or not. Writting magic words on a check doesn’t discharge the debt, an agreement with your creditor discharges the debt. And cashing a check with magic words on it doesn’t constitute agreement on the part of the creditor that the full debt is indeed discharged.