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Can someone smarter than me tell me how ERC6551 tokens can execute transactions? This is one of the things people tout, but AFAICT, it's just not true. 6551 is awesome without the added marketing speak.

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ERC6551 accounts can execute operations (calls where msg.sender == account), but cannot originate transactions (calls where tx.origin == account). This is the same behavior as any other smart contract account.

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For simplicity, does this mean that if I look at a block explorer, it is impossible for the from address on a transaction to show as the TBA?

depends on how block explorer chooses to display the data. it probably would always show the EOA originating the tx as "from", but might do something like below screenshot where they highlight the 4337 contract that is considered msg.sender in the tx

Ah interesting. Ok, this is helpful, thank you!