The account value is the real-time worth of the money you've invested in BlueChip.
Account value = Total BTC * BTC's current price + Total USD
It is the sum of the present value of held BTC (calculated by multiplying BTC's current value with the total BTC held) and the held USD. If BlueChip were to sell all held assets at that moment, "Account value" is the resulting USD from the sale. Since this value is calculated based on BTC's market price, the value fluctuates along with BTC's price. So the value can change each time you visit the page. The BTC and USD totals do not include what's held in Robinhood that isn't invested with BlueChip.