Ravencoin, a cryptocurrency, is facing a potential rollback of transactions due to a critical block flaw. According to reporting from CoinDesk, two mining pools controlling most of Ravencoin's hashpower are building a replacement chain from before Friday's first invalid block.
This move puts deposits, withdrawals, and payments made since then at risk of reversal. The replacement chain would essentially undo transactions from the past four days, affecting users who have made transactions during this time.