I tried to find out about it too but still do not really understand it. It was as complex as trying to understand exactly how the internet works.
Bitcoin has no intrinsic value, much like fiat currency and like the internet it can be hacked
https://www.theguardian.com/technology/2017/dec/07/bitcoin-64m-cryptocurrency-stolen-hack-attack-marketplace-nicehash-passwords
" approximately 4,700 bitcoin being stolen, worth about $63.92m at current prices," just a few days ago and "Mt. Gox shut down in February 2014 having lost approximately 850,000 bitcoins, potentially to hackers." which at the price that the 4,700 bitcoin stolen would be just under 12.5 billion $.
And last week Bitcoin was allowed into the 'futures' market - derivatives and all the chicanery that opens up.
Gold backed currency johnny37 ceased to be with Nixon 'shock' in early 1970's and it would be fantasy if it still existed as now the 'paper'/ futures/derivative/ gold is possibly valued at a hundred times the value of all the actual physical gold that has been mined on earth.