防

fáng to protect; to defend; to guard against; to prevent

追踪

zhuī zōng to follow a trail; to trace; to pursue

加密货币

jiā mì huò bì cryptocurrency (e.g. bitcoin)

常见

cháng jiàn commonly seen; common; to see sth frequently

安全问题

ān quán wèn tí safety issue; security issue

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