Ravencoin (RVN) could roll back four days of transactions after critical block flaw, with two mining pools building a replacement chain; RVN fell 17% to $0.0029. The flaw allowed bad blocks to enter the record since Friday, August 7. Mining pools 2Miners and RavenMiner, which control most of Ravencoin's hashpower, are rebuilding the chain from before the first invalid block, putting deposits, withdrawals, and payments made since then at risk of reversal. Exchanges like Bitvavo and Upbit have suspended RVN deposits and withdrawals, with Upbit also issuing an investment warning.