Just had a let down. Bought my Bitcoin in 2013 on Bitstamp with full verification as German citizen living in Germany. Now that my bank account is almost emptied because I have no job and no income, I wanted to cash out 3-4K to have some cash for the next months. Bitstamp asked for proof of where I got my crypto from to be able to cash out. So I showed em the buy history on my Bitstamp account. Now they asking me where I got that money in 2013 to buy the Bitcoins. How the hell can I proof money I saved over a time span of 10 years. For example by selling your old 2nd hand stuff etc. Ridiculous. Gonna try Binance now.
Log in your bank account and search for banking history dating back to ~2013 range. If you had a job at that time you need screenshot those slips and mark it with a red line the salary deposits. Ore screenshot your savings.
Bitstamp asked me the same questions and this is how i did that, having no problems cashing out money every month for my retirement. Money transfer takes a few hours which is fast.