Can I enter Binance generated BTC Address for deposit into Slushpool Payouts Wallet for long term use ?
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It's not a good idea to use exchanges as your personal wallet, exchanges can be hacked and you might lose your money.
Is this address fixed or changes from time to time and if it changes will the old address still be valid and I'll receive the money?
Different exchange have different set of rules, but it's mostly fixed address. binance BTC deposit address are fixed. when changes to wallet/deposit address are made, exchanges probably will send notifications.