In business since end of 2007, VirWoX is today the the leading independent exchange for trading virtual currencies, both in terms number if users (about 74,000), and trading volume (2010: 10 million Euro / 14 million US$).

Currencies traded are Linden Dollars (the virtual currency used in Second Life), Avination's C$, and the Open Metaverse Currency (OMC). In April 2011, VirWoX started accepting Bitcoin and enabled to trade bitcoins for Linden Dollars (both ways), which are in turn convertible to EUR, USD, GBP, CHF, and the other virtual currencies traded on VirWoX.

Other payment methods (deposit and withdrawal) include PayPal, Credit/Debit Cards via Skrill/Moneybookers, NETELLER, paysafecard, DIRECTebanking.com, and bank transfers.
VirWoX is run by the company Virtual World Services GmbH, which is located in Austria. The service is available in five languages (English, German, French, Spanish, Italian).

Bitcoin (BTC) is a decentralized digital currency based on an open-source, peer-to-peer internet protocol. It was introduced by a pseudonymous developer named Satoshi Nakamoto in 2009.
Internationally, bitcoins can be exchanged by personal computer directly through a wallet file or a website without an intermediate financial institution. In trade, one bitcoin is subdivided into 100 million smaller units called satoshis, defined by eight decimal places.
Bitcoin does not operate like typical currencies: it has no central bank and it solely relies on an internet-based peer-to-peer network. The money supply is automated, limited, divided and scheduled, and given to servers or "bitcoin miners" that verify bitcoin transactions and add them to an archived transaction log every 10 minutes. The log is authenticated by ECDSA digital signatures and verified by the intense process of bruteforcing SHA256 hash functions of varying difficulty by competing "bitcoin miners." Transaction fees may apply to new transactions depending on the strain put on the network's resources. Each 10-minute portion or "block" of the transaction log has an assigned money supply. The amount per block depends on how long the network has been running. Currently, 25 bitcoins are generated with every 10-minute block. This will be halved to 12.5 BTC during the year 2017 and halved continuously every 4 years after until a hard limit of 21 million bitcoins is reached during the year 2140.
Bitcoin is the most widely used alternative currency. As of March 2013, the monetary base of bitcoin is valued at over $500 million USD. The large fluctuation in the dollar value of a bitcoin has evoked criticism of bitcoin's economic suitability as a currency.




How to buy bitcoins
With Linden Dollars

After you have opened an account, deposit the Linden Dollars (SLL) at one of the in-world terminals in Second Life.
Then log in on the VirWoX website and enter an order to buy BTC on the "Exchange BTC/SLL" page. Depending on the type of order (Market or Limit), this will convert the Linden Dollars to BTC immediately or at some later time.
Finally use the "Withdraw" page to send the BTC to a Bitcoin address. You can also use VirWoX as a eWallet and keep your BTC there for later use.



How to sell bitcoins

After your have opened an account, go to the "Deposit" page, scroll down to the "Bitcoin" section and click on the "Create my Bitcoin address" button. This will create a unique bitcoin address associated with your account. You then send the bitcoins you wish to sell to this address. As soon as the bitcoin network has confirmed the payment (5 blocks), the bitcoins are booked to your account, and an email is sent to you.

For Linden Dollars

To exchange bitcoins to Linden Dollars, go to the page "Exchange BTC/SLL", and enter an order to sell your bitcoins. Depending on your order (Market or Limit), this will be executed instantly or at some later time. You may then withdraw the Linden Dollars to your Second Life avatar or continue.



Fees

VirWoX charges 50 SLL (currently about 0.02 BTC) plus 2.9% for BTC/SLL market orders. The fee for limit orders depends on the previous trading volume of the account, and varies between 0.78% and 3.9%[4].
VirWoX charges 0.02 BTC for BTC withdrawals. Deposits in BTC are free.

Links:
- VirWox
- Bitcoin

You can buy your Linden Dollars right here on your right!