South Korean exchange Bithumb filed a petition with a local court to freeze seven bitcoin, valued around $8 million, after a February promotion error mistakenly credited winners with 620,000 bitcoin each. Users sold roughly 1,788 BTC before accounts were frozen; most coins were recovered, leaving about 12.3 billion won still outstanding, now reduced to seven bitcoin. Korean law treats the situation as unjust enrichment, requiring recipients to return the assets, and a civil lawsuit is expected. Read on coindesk.com