Have half of BTC at hand. Want to find a way for better investment rotation to be done. So far invented such a scheme. The whole amount to be exchanged for any local currency. Surplus since last investment to be converted back to BTC. Remaining - initial investment - to be spent on daily needs. Converted BTC to be put back into wallet. Two points of interest here.
First: Does this way of turnover looks reasonable at all?
Second: How to make sure I use "clean" BTC from source of exchange?
If you have half of bitcoin at hand why did you want to covert all to your local currency, then after which you buy back bitcoin. Do you know what could be bitcoin price at that time or do you know if the price of bitcoin would go down low for you to invest in bitcoin again, most time it is important to always sell out the amount of money we would want to use than selling of our holding and later sell them back to btc at then you might lose alot without you knowing you are really losing bitcoin in your possession.
Let say you want a specific amount in your local currency why not just convert that amount to your currency than selling the whole half of bitcoin in your possessions.