The bitcoin address that received the 50 BTC mined in block #9 on January 9, 2009
belongs to Satoshi Nakamoto. There were 14 blocks mined that day, the first day of bitcoin mining. None of the bitcoin addresses from that day have outgoing transactions (to date) except for the one from block 9. The block nine bitcoin address was used in the first transaction ever on January 12, 2009 to send Hal Finney 10 BTC.
How To Prove You Are Satoshi
In the post-Craig Wright era, there is only one way to prove you are Satoshi; demonstrate control of this bitcoin address. But really if you can move any of the bitcoins mined in the first day people should believe you (or they should at least believe that you tortured and killed the real Satoshi after he gave you the private keys).
The Real Satoshi Should Be Able To Demonstrate Control Of These Addresses From The First Day Of Mining
Unless you are prepared to prove you control one of these addresses (ok, not the genesis block) do not waste your time. After Craig Wright this is the new litmus test, and it’s impossible to fake and not too much to ask. Anything less and no one will believe you.