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What is the bitcoin backed by? As in gold itself is backed by itself and works GREAT but once again doesn't happen instantly like digital transactions and those wanting them need/want.I guess since most who would be interested in bitcoins are also aware of the current economy, where our government ( and others ) are trying to take us AND if they succeed I don't see the point in a digital currency but rather something that can be locally traded like shire silver or other "physical" goods.

Vice article comparing gold and bitcoin as viable currency alternatives to the USD.

Bitcoin sounds like something from science fiction: A purely digital currency, created by an anonymous hacker, that operates outside the world's traditional banking systems. The four-year-old currency is very real, though, and it's trading an all-time high, tripling in value in the last two months alone. One bitcoin is was worth about $40 U.S. dollars on Tuesday, and surged on Wednesday to nearly $49. That's up from around $13 in January, and 5 cents in 2010, according to Mt. Gox, the bitcoin market's main exchange.

Bitcoin is a free and easy to use, open source peer-to-peer electronic cash system that is completely decentralized, without the need for a central server or trusted parties.

Users hold the crypto keys to their own money and transact directly with each other, with the help of a P2P network to check for double-spending. Users can transfer money easily through the Internet, without having to trust middlemen. Third parties can’t prevent or control your transactions.

The unregulated digital world of Bitcoins suffered another flash-crash last night. According to Ars Technica, the 23% plungefest in the value of the digital currency (the second in a week) was due not to Waddel & Reed, not HFT algos, but 'forking' Cryptographic algos gone wild agreeing on different (legacy) keys as being correct - akin to finding Tungsten in your Gold bars (and hence the drop in the value). This latest glitch is different from the problem that caused Bitcoin prices to briefly crash to zero in June of 2011.

It differs from its parent Bitcoin in that can be efficiently mined with consumer-grade hardware. Litecoin provides faster confirmations and uses memory-hard, scrypt-based mining to target the CPUs and GPUs most people already have. The Litecoin network is scheduled to produce four times as many currency units as Bitcoin. The purpose of Litecoin is to function as silver to Bitcoin's gold, in the sense of being a relatively less valuable coin that is easier to obtain and transact with.

In Kreuzberg, Berlin, virtual currency Bitcoin has expanded off the internet to become a favoured medium of exchange in real shops and bars. Joerg Platzer, the owner of bar Room 77 is helping to establish what he believes to be the world's first Bitcoin local economy.

That’s where Bitcoin thrives: where people would prefer to throw in their lot with anonymous strangers instead of the world economy. It’s gold-bug thinking reinvented for an age of fluid transparency and instantaneous transactions. And as such it’s an excellent indicator of anxiety. Where you see Bitcoins in action you find a weird and heady mix of speculative angst, a fear of being left behind, and people who appear to have lost faith in institutions, who feel most left behind.

Are physical Bitcoins legal?

Bitcoins aren't just an abstract financial instrument living somewhere in the digital ether anymore. They're now a physical currency capable of taking a ride in your pocket or scratching off your lottery tickets.

The physical Bitcoins, called Casascius Bitcoins and created by a guy in Utah named Mike Caldwell, are made of brass, with gold electroplating on the 25 Bitcoin denomination. And, of course, they're tied to the peer-to-peer, open-source digital currency that's been exchanged on the Internet for a while now.