Bitcoin is based on fiat? That's a new one for me. I never heard no one say that before. If bitcoin is based on fiat then what's the use of bitcoin? who needs bitcoin if bitcoin is based on fiat? the only way bitcoin could be based on fiat is if satoshi would have made it a stablecoin but he didn't do that so... maybe you need to re-read the thread where people are talking about bitcoin being based on people's trust and belief in it as being "valuable" for whatever reason.