The blockchain confirms all transactions and the miners confirm all the transactions by confirming that all of the transcations are real and are not frauds.
Completely agree with you, mate. Bitcoin is backed by blockchain technology and the people that support it. Since it's a purely speculative asset, people determine what its value would be in the long term. With blockchain technology, fraud and double spending problems are no longer a real threat when compared against traditional fiat currencies. As such, Bitcoin's strongest point is the public ledger which is transparent and anyone can verify, allowing for greater security and reliability.
Many say that Bitcoin is not backed by anything, but it is all the contrary as real-world resources become spent to help preserve it for years to come. Every day, lots of individuals, businesses, and corporations join Bitcoin to help it become a mainstream digital asset. Therefore, Bitcoin is and will always be backed by people, and its underlying revolutionary technology which is highly safe and efficient (when compared against traditional centralized monetary systems). Just my thoughts.