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An EOA only comprises its nonce (i.e., number of transactions sent) and the associated balance (i.e., number of ethers owned by the account).The other reason is safety. Looking at 2009 alone, 32,489 blocks were mined; at the then-reward rate of 50 BTC per block, the total payout in 2009 was 1,624,500 BTC, which is worth $13.9 billion as of October 25, 2019.