Change 'recognized' to 'stored' in your second paragraph. If people don't store it, it's not a currency, even if they use it.

No one willingly stores unstable currencies. The only time people use unstable currencies is if they are forced to by law, or if they are speculating.

When you hear people talk about "the stability of a currency" they are talking about fluctuations of a few percent, not 10s of percents.