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i need to design such a system that whenever user A and B send ether to my designed address, he is sending ether to my only address, but in my app they will see their personal amount updated. It should be similar to a crypto exchange, that they only have one big wallet holding all the tokens, but for user specific token amount, its just some data in their database. My question is: how to create such a system/address that people can send to my only address but still we can keep their personal data?

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