I've just found a new web tool: https://btcdiv.com. Thanks to btcdiv.com you can check whether you claimed a dividend/airdrop or not.
Simply go to https://btcdiv.com and paste you BTC address, click "Search" and wait for it.
At the end of the process, you'll be able to see what fork or airdrops you did not claim, follow the steps and you're done!
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