The digital signature is the biggest proof of ownership it is the one thing that we all been waiting for
One day the early mined coins will move and the Bitcoin community will think that it's Satoshi. We think that Satoshi has created a Bitcoin prize competition and that the privatekeys are somehow within the blockchain
https://bitcointalk.org/index.php?topic=5159185.0 and that others will move these coins.
Yes, almightyruler, anything could have happened. And Satoshi knew that all. He tested all the blockchain with many computers before releasing the applications. He knew what can happen.
Gavin Andresen started a project to give away free Bitcoins https://freebitcoins.appspot.com/ (no more working) and Satoshi wrote June 2010:
Excellent choice of a first project, nice work. I had planned to do this exact thing if someone else didn't do it https://bitcointalk.org/index.php?topic=183.msg1620#msg1620
He waited but thought that someone else will do it. We think that he is waiting that someone moves the early mined coins to show to the Bitcoin community that it's a prize competition and that the private keys are somehow on the blockchain.