...commentator said what makes a currency is value...
This commentator is wrong.
A currency serves to facilitate the exchange of goods. It's the goods that have the intrinsic value, not the currency. Otherwise you might as well trade your sheep directly for your neighbor's car, as opposed to going through all those complicated financial transactions.
It doesn't really matter what currency is made of as long as the amount of forgery and cheating remains low. The rest is a matter of trust: you only accept money if you trust that you can spend it in the future. So the supply of currency needs to be somehow managed -- if there is too little it'll gum up all economic activity and if there is too much it'll erode trust and create inflation. All those bad things also happened in the age of gold currency -- so that was not a great solution.
It should be obvious is that using stuff with real value as currency is a bad idea. Gold (and silver) is mostly useless, hence its great success as currency. You can cast your bronze into tools or coins, but you can't do both. You can use electricity to create/manage bitcoin or to to perform useful work, but you can't do both. Why not trade in toes? Those are useful, in limited supply, and hard to forge. It might, though, create a bit instable footing for your economy.
Bitcoin creates an artificial and quite inflexible amount of scarcity: its supply cannot be properly managed. So it is not really great as a currency. On the plus side, you only have to trust those managing the blockchain, those holding your wallet, and the rest of the world keeping the valuation afloat. Or you could trust the federal reserve to manage the dollar -- it's your choice. Both are bound to go south at some point and to some degree. That's why some people keep some savings in stocks and gold and real estate, ... Boring, isn't it?