TRON founder Justin Sun has intensified his accusations against the Hong Kong custodian company First Digital Trust (FDT), claiming it is involved in a $500 million embezzlement scheme. Sun alleges that FDT transferred $456 million, originally intended for investment in a Cayman Islands fund, to an unauthorized company in Dubai, Aria DMCC, describing this action as similar to an "address replacement attack" seen in blockchain hacking. He also accuses FDT's CEO Vincent Chok and others of illegally profiting tens of millions of dollars through secret kickbacks. In response, FDT has filed a defamation lawsuit against Justin Sun in the High Court of Hong Kong, seeking to prohibit him from repeating the related accusations. This incident has already impacted the market for FDT's stablecoin FDUSD.