In Bitcoin genesis block or block #0, Satoshi hashed a message
The Times 03/Jan/2009 Chancellor on brink of second bailout for banks
Not a transaction
Clearly, Satoshi want to "destroy" banks with a dezentralized, open, trustless, borderless, etc.. or simply called
BitcoinAfter that, block reward came from nonce (mining) block #0 since it also required:
Nonce 2083236893
Block Reward 50 BTC