Startup Idea: Bitcoin Transaction Conversion App

Startup idea to develop an app that shows the real-time USD value of Bitcoin transactions, optimized for specific timestamps. The app aims to simplify accounting for businesses using Bitcoin by providing an automatic calculation of Bitcoin to USD.

I use Bitcoin as a payment method for my business. Unfortunately, the price of Bitcoin is always fluctuating. It's hard to keep track of what a BTC is in USD on a specific date. Bitcoin is becoming more widely accepted but at this point is not something that most businesses accept as currency nor does the government allow you to pay taxes with Bitcoin. I have to withdraw/sell my Bitcoin to be able to use that money normally. It requires me to login and view my bank account, match it with the appropriate Bitcoin transaction, or manually calculate how much in US dollars I earned. Of course I could research for accuracy, but it would be useful to have an app that displayed the USD price (on the time stamp) next to the amount of Bitcoins in each transaction. That would save so much time in accounting.