Ethereum Classic has suffered a 4,000-block-long reorganization, its second such incident in five days. The first attack, which saw more than 3,000 blocks reorged, had an attacker steal more than 800,000 ETC, worth about $5.6 million.
Security firm SlowMist has come out with a public analysis of the latest chain attacks seen on ethereum classic.
Ethereum classic's blockchain has been hit by a suspected 51 percent attack, leading to reorganizations of its transaction history.