It's been rumored that one entity contributed 3000 BTC. Is there any way to proove this? While it is not entirely possible to disproove it, maybe it would be possible to show how the rumour came to life, if it is, in fact, just a rumour.
If it is true, this entity holds the majority of coins at the moment.
It came to life when Sasha moved the first Bitcoins to the Coinbase wallet which were around 3k BTC. That's it. You can check it out on the blockchain.