I want see full detail. He receive how much BC,BTC... and sell at? please professional working.
I'm pretty sure there's a blockchain...
However, unless you have a price history for CoinBase (or whatever was used for the BTC-fiat conversion) it will only be a rough estimate. This is the nature of cryptocurrencies and unregulated markets.
On the other hand, I've never put $100 USD in my wallet on a day when that would buy 20 Gals of milk and then suddenly discover that the very next day it could buy 300 Gals of milk. LOL!