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I am trying to trace history of transactions in ethereum. I am using a function called getStorageAt(). Now what should be the input to this function, a contract address or account address(account no)?

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https://github.com/ethereum/wiki/wiki/JavaScript-API#web3ethgetstorageat

web3.eth.getStorageAt(addressHexString, position ...

For addressHexString you will want a contract address, since random addresses are unlikely to have any values in storage.

For position, see How do I get the storage indices/keys?

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