From this link, I saw something relating to "sovereign money"
Sovereign money is legal tender, on hand or on account as well as on mobile storage device, in the future maybe also in the form of so-called cryptocoins....Today, sovereign money exists in the form of cash (coins and banknotes) and non-cash central-bank money, called reserves
For a better understanding of what sovereign money is and what it implies, it is useful to compare it with bankmoney. Normally, bankmoney is as liquid as sovereign money, i.e. available any time on demand. But sovereign money does in fact exist; it is the safe property of the customer who owns the money. Bankmoney, by contrast, is not money proper, not legal tender, but just a claim on money, a claim on having paid out cash. Bankmoney is but a balance-sheet item of a bank, thus basically unsafe and unstable. In a banking crisis, money in a bank account might disappear.
From reading these definitions, I got lost regarding distinguishing "bank money" and "sovereign money". Is there any intuitive way to understand these two concepts separately? From my understanding, we can distinguish that bank money is the bank deposit, the "paper" that bank claim that we have money in their system. The sovereign money is the coin, cash-at-hand, something protected by the government. For example, when the bank goes bankruptcy, the 'bank deposit" (bank money) is invalid, but the cash and coins (sovereign currency) still remain their own value. It also explains why the sovereign currency is legal tender but bank money. I am wondering whether it is a correct understanding.