Excuse me, I'm a bit confused about the legality of cryptocurrencies in Australia. Could you please clarify if it's legal to buy, sell, and use cryptocurrencies in Australia? I've heard different opinions on this matter, and I'm hoping to get a definitive answer from someone who knows the industry well. Additionally, if there are any specific regulations or laws governing the use of cryptocurrencies in Australia, could you please elaborate on them? Thank you for your time and assistance.