Mining pools controlling most of Ravencoin’s hash rate are building a competing chain that could trigger a three-day reorganization. Ravencoin dropped to a new all-time low on Wednesday as an exploited consensus vulnerability left several days of transactions at risk and prompted exchanges to suspend RVN transfers. On Tuesday, Ravencoin said the exploit caused vulnerable nodes to accept invalid blocks, with the first known instance appearing at height 4,487,776 on Friday. Ravencoin warned that transactions confirmed after block 4,487,775 could be reversed and may not automatically return to the mempool or be mined again. Upbit and Bitget suspended RVN transfers, although Upbit left trading available.