The whole concept of tangible versus intangible when it comes to currencies is flawed. After all, tangible asset holdings are very different when you have say a fluffy pillow versus a banana tree (which also holds different value if you live/don't live where they can actually grow) versus gold versus copper versus farm land versus a mickey mouse alarm clock, etc etc. There's this really great quote from Warren Buffett in an interview where he dives into this:
Warren Buffet: "….Well, I just don’t know. I don’t know whether cotton’s going to go up. I mean, we use a lot of cotton. I’ve watched it go from 80 cents to $1.90. You know, we use a lot of copper and I’ve watched it go from $2 to $4-plus, so I mean there’s all kinds of things in this world that are going to go up and down in price. You know, maybe hamburgers will tomorrow. And— but I— I’m— I don’t know how to judge that.
I do know how to judge to some extent the earning power of some businesses. And the real test of whether you would like it as an investment is whether you would be happy if it never got quoted again, and just in terms of what the asset did for you. But that doesn’t—
I will say this about gold, if you took all of the gold in the world it would roughly make a cube 67 feet on a side. So if you took all the gold in the world, we could have a cube that went down there 67 feet high and that would be the whole thing. Now for that same cube of gold it would be worth at today’s market prices about $7 trillion. That’s probably about a third of the value of all the stocks in the United States.
So you could have a choice of owning a third of all the stocks in the United States or you could have a choice of owning that little block of gold, which can’t do anything but kind of shine there and make you feel like Midas or Croesus or something of the sort.
Now, for $7 trillion, there are roughly a billion of farm— acres of farmland in the United States. They’re valued at about $2 1/2 trillion. It’s about half the continental United States, this farmland. You could have all the farmland in the United States, you could have about seven ExxonMobiles, and you could have $1 trillion of walking around money.
And if you offered me the choice of looking at some 67-foot cube of gold and looking at it all day, you know, I mean touching it and fondling it occasionally, you know, and then saying, you know, `Do something for me,’ and it says, `I don’t do anything. I just stand here and look pretty.’ And the alternative to that was to have all the farmland of the country, everything, cotton, corn, soybeans, seven ExxonMobiles. Just think of that. Add $1 trillion of walking around money.
I, you know, maybe call me crazy but I’ll take the farmland and the ExxonMobiles….."
So yes, Bitcoins are intangible as they are digital. So yes, Bitcoins are tangible because it's backed by a physical network of people and computers, and math. But really, the concept of intangible and tangible when it comes to "backed" currencies is flawed because people lose sight of what actually has real value from a tangible sense of investing.
Tangible and intangible are a philosophical debate anyway as much as liberalism and realism are in the philosophical debate. The key really comes into how we collectively agree to value both terms to see relevance.
(sourced from my own site:
http://coincollectingenterprises.com/investment/warren-buffett-gold-useful-vs-useless-investments)