If I have crypto held in a USA company/bank that gives me interest (denominated in crypto), is that an ordinary income taxed through the Australian tax office, OR do I need to declare this interest earned as foreign income and file taxes in the USA because it's through an American company? Does the interest's denomination affect how this is treated? e.g. If I was paid interest in G-USD instead, or paid in AUD directly?
If the price of crypto heavily dips (or heavily surges) on the minute I receive the interest, how is fair market value calculated? e.g. if I earn 0.01 btc credited at 9am, at the same time the prices were trading at A$63000 and A$45000, is my fair market value A$630 or A$450, or an average of the two?
If I intend to dispose of this interest same day ASAP, (as soon as it is credited to the account and withdrawals processed), could my disposed value be considered the fair market value? e.g. If I earn 0.01 btc at 9am, I sell it for A$630 ASAP with 1-2 hour delay at most, is my fair market value 630, or is this an invalid calculation? Or do I still need to find the fair market value at precisely the time it was credited? (What if the time is not provided by the company?)