There is a myriad of reasons why someone would want to convert a Bitcoin balance to USD. For example, they've received their friend's share of last night's pizza in BTC and want to deposit them into their bank account to cover their Comcast bill. But how do they go about it? We recommend using Coinbase — it's fast and secure. Here's how.
The easiest way to convert BTC to USD is through an exchange like Coinbase. You don't have to hold a constant balance there, either. Just create an account, transfer the amount of Bitcoin you wish to convert from your external wallet, then sell the BTC. Once the trade has been processed, withdraw the USD to your bank account. Simple.
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While there are other methods available (the most common involves sending the Bitcoin to another person and them sending back the USD equivalent via bank transfer), Coinbase is the safest and most secure. This is because you aren't relying on other people; it's a registered, regulated, international company with a proven track record.