I discovered a major flaw in the OK Wallet. For example, if my A address is generated through a referral link, and then I use the B address on the same phone to click on A's referral link in the OK Wallet, the system can recognize that it's coming from the same device. What does this mean? It might suggest that OK can actually associate my different wallet addresses in the backend. A lot of people choose decentralized wallets because one of the most important reasons is to ensure complete independence between accounts, without any linkage. But OK's design here implies that the referral feature might come with device fingerprint tracking capabilities. I tested this as soon as the referral feature went live, but it also made me realize a potential concern: even completely unrelated wallets might already be identifiable by OK's backend as belonging to the same person.