When someone "mines" for bitcoins, where does the money come from? I know back in the old days, when the U.S. printed money, they had gold to back it up. What is backing bitcoins? Could someone explain it in laymans terms?
As I explained as a comment in the topic
"Who or what is this math being done for?":
All around the world there are thousands or millions of CPUs/GPUs grinding away on math equations in the hopes that they will "solve" one of them and reap the reward of 50 bitcoins. One thing that troubles me (and Ive yet to find the answer); who is this math being done for?
To which I replied:
The energy is not wasted. It goes to feed the bitcoin gremlin. The bitcoin gremlin likes to eat hash cycles. If you provide the bitcoin gremlin with enough hash cycles, he will reward you with 50 bitcoins.
I should also mention why it is that us humans have reached this mutually-beneficial agreement with the bitcoin gremlin. Long ago, there was a great conflict between us humans and the gremlins. Basically, these gremlins would eat anything, and I mean anything! This is all explained in an excellent 1984 dramatic theatrical documentary entitled "
Gremlins" by Steven Spielberg. Gremlins are descendents of cute sentient creatures known as Mogwai. According to the
Wikipedia article on Mogwai, there are 3 "rules" for keeping a Mogwai:
(1) "Don't get him wet" as, when exposed to water, it immediately reproduces more of its kind asexually by budding from its back.
(2) "Keep him away from bright lights....especially sunlight." Sunlight will kill a mogwai and bright light is known to hurt it.
(3) "Never feed him after midnight" because if it eats food after midnight, it will create a cocoon and emerge as reptilian monster called a gremlin.
Unfortunately, one of the humans who obtained a Mogwai failed to follow these rules. Chaos ensued (i.e. lots of gremlins eating lots of humans' property). The issue still wasn't resolved even by the next decade as can be shown in the 1990 documentary "
Gremlins 2: The New Batch". As I said before, basically these gremlins
would eat anything! It wasn't until late 2008 when a genius Japanese security researcher called
Satoshi Nakamoto figured out a clever solution. The key was to realize that these gremlins
would eat anything. Satoshi devised a clever mechanism whereby large numbers of humans would be incentivized into running their CPUs and GPUs at maximum utilization rate producing needles strings of 1's and 0's such that their SHA256 hash would have 0's in their most significant bits. It turns out that these gremlins really like the taste of bit strings that have SHA256 hashes containing 0's for their most significant bits. Yes, the gremlins like to eat your hash cycles, but they
really really love these tasty SHA256 hashes with the 0's at the top. Furthermore, Satoshi's figured out a way that the humans would be non-coercively incentivized to produce on average one of these so-called "blocks" every 10 minutes. This was a significant discovery, because that rate just so happened to satisfy the gremlin community's demand rate for these tasty 0-topped SHA256 hashes (although there was some very tough negotiation on behalf of Satoshi representing the humans to reach this amenable agreement). In return, it turns out that these gremlins excrement something in their feces from eating one of these special 0-topped SHA256 hashes that we all know and love dearly called bitcoins. Peace & Happiness ensued between the humans and the gremlins. And thus this concluded the great conflict between humans and gremlins. If you are curious, this will all be animated in an upcoming documentary entitled "
Gremlins 3: The Bitcoin Accord".
Anyway, back to your original question of
"What is backing bitcoins?", well the answer is that
mining for bitcoins is the price society pays for peace and social stability with the gremlins. Failure to meet the gremlins' appetite will mean utter destruction of most tangible human property and most likely a return to the stone age. Yes, you could say that
mining for bitcoins is the price we pay for civilization. This is why these bitcoins are valuable to humans, and is why humans will gladly exchange valuable goods, services, and fiat currency for bitcoins.