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I'm hoping to implement something like this, for even external tokens:

transaction_details(address, token_contract)

which will return the transaction history, i.e. sender, receiver, amount, timestamp...

Is this possible from inside a smart contract?

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You can, but it's going to be nontrivial, as smart contracts do not have direct access to the transaction history of the blockchain, only to the current state.

With a tool like Oraclize you can get data from outside the smart contract ecosystem and use them inside of it. Depending on your use-case however, you probably had better keep this functionality off-chain.

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