Can anybody help.

I found this old notebook from approx 2011 with my brother and father's names In it. It has values and at the top of the page it is written blockchain.

There is also a password written down but no email, key or username.

In the notebook there is my brother's name with 300 and 186.47 underneath. The next line has my father's name and 260 with 124.87 underneath.

My only guess is the 300 and 260 are quantities of coins and the 186.47 and 124.87 is the amount spent on said coins in gbp. I assume they are bitcoin. Does this correlate with the price of bitcoin in 2011? What blockchain websites were around in 2011.

The only memory I have of this back then was my brother signing up to a website called banners broker. But I am pretty sure that site had nothing to do with blockchain.

Is my family rich? Any help here would be much appreciated.