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"State-bloat" attacks led to an empty account being defined as an account that has zero balance, nonce and code.

There was a disagreement on EIP 161:

I disagree. An account should be considered empty when the code, nonce, balance and state root is empty.

Is it possible to have an empty account with a non-empty state root? What is the difference between requiring the state root to be empty or not?

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