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Aug 23, 2018 at 19:53 comment added Lucian Boca That's precisely what most (if not all) the custodian exchanges are doing: generate an address, fund it with enough ether to cover the gas fees for a few token transactions, then get the ether out if the user gets inactive for too long. They use a single address for all the tokens, so it's one address per user.
Aug 22, 2018 at 17:21 comment added susanoo thanks, i saw it's not a standard but somehow exchanges have to collect even small amounts of tokens from great amount of addresses and I'm pretty sure they are not sending GAS for each of these accounts as it will be expensive
Aug 22, 2018 at 13:39 history answered Lucian Boca CC BY-SA 4.0