user21748: I was given an actual casascius bitcoin minted in 2011 as a tip, and I'd like to know where I can exchange it for US dollars. 
How would I extract the private key from this coin to gain access to the digital bitcoins if I were to sell them online?

user2306: You have two routes here:
Sell the physical Bitcoin
Don't remove the sticker on the back. Use a website like localbitcoins to sell it to someone near you.
Some people might want a physical Bitcoin, especially since they're not being made anymore.
Sell the Bitcoin 'contained' within the physical coin.
Peel off the sticker on the back. Inside will be a code that lets you spend the Bitcoin. (I recommend using Blockchain.info as your e-wallet.) You can sell the Bitcoin online or locally.
The remaining brass part is mostly worthless.

21748: <p>I was given an actual casascius bitcoin minted in 2011 as a tip, and I'd like to know where I can exchange it for US dollars. </p>

<p>How would I extract the private key from this coin to gain access to the digital bitcoins if I were to sell them online?</p>
 2306: <p>You have two routes here:</p>
<h3>Sell the physical Bitcoin</h3>
<p>Don't remove the sticker on the back. Use a website like <a href="https://bitcoin.stackexchange.com/questions/13117/how-do-i-buy-bitcoins-safely-face-to-face">localbitcoins</a> to sell it to someone near you.</p>
<p>Some people might want a physical Bitcoin, especially since they're not being made anymore.</p>
<h3>Sell the Bitcoin 'contained' within the physical coin.</h3>
<p>Peel off the sticker on the back. Inside will be a code that lets you spend the Bitcoin. (I recommend using <a href="https://blockchain.info/wallet" rel="nofollow noreferrer">Blockchain.info</a> as your e-wallet.) You can sell the Bitcoin <a href="https://bitcoin.stackexchange.com/questions/12419/good-way-to-sell-bitcoins-online">online</a> or <a href="https://bitcoin.stackexchange.com/questions/13117/how-do-i-buy-bitcoins-safely-face-to-face">locally</a>.</p>
<p>The remaining brass part is mostly worthless.</p>
