In China, the legality of cryptocurrency trading occupies a delicate vacuum: individual buying and selling is not a crime, yet it receives no legal protection; a bank account can be frozen for six months or longer because of a single "unclean" fiat deposit. This predicament ? "trading is not illegal, but freezing is non-negotiable" ? is imposing real costs on global traders and OTC merchants. Some have made millions from crypto but dare not cash out; others have been drawn into criminal investigations over a single transaction worth tens of thousands of yuan.

This book is not another gray-market manual teaching people how to "circumvent regulation." It is a compliance survival guide grounded in current law and practical cases. It systematically deconstructs the trigger mechanisms behind Chinese bank account freezes: from how a telecom fraud victim's report initiates fund-chain tracing, to how public security organs, anti-fraud centers, and commercial banks operate in coordination under the "Operation Card-Breaking" framework. More importantly, it provides an actionable response framework: what to do within 48 hours of a freeze, how to obtain key information from banks, how to build an evidence chain of "good-faith acquisition" when communicating with case-handling authorities, and how to remove the "central-to-central" control label after unfreezing.

A core judgment runs through the entire book: the root cause of frozen cards lies not in technology, but in cognition. Most traders do not realize until their accounts are frozen that they have long been situated on a hidden criminal fund chain. Understanding how this chain operates is the starting point for unfreezing ? and the learning cost that must be paid to continue engaging in crypto trading in a jurisdiction that "does not support but does not absolutely prohibit" it.