I'm looking for a website that gives me the Bitcoin price for any date, in such a way that it can't be debated.
Usage: I want to make a prediction contest, in which the price on November 1 at a certain time(zone) has to be predicted. Coinbase allows me to export data, but it can be debated. If I compare the CSV for 1w to 3m, it is inconsistent: at the same time and date, the price can vary slightly.
Bitcoinaverage has a graph that I can read the price from, but it uses my local time zone, and depending on how far I zoom in, it gives a slightly different price again.
What website can produce this? I know there is of course no "exact" Bitcoin price, but as long as the site gives a clear answer and nobody can influence it directly, it's fine by me.
No spam
All my threads are now self-moderated to stop signature spam. I will remove all irrelevant posts. If you quote the entire OP, your entry will be deleted. 
