According to the Horizen team, Horizen ’s mandatory software upgrade will be activated at block # 1047624, estimated at 14:00 UTC on 1 Dec. Gate.io supports this upgrade and will suspend ZEN deposits and withdrawals during the process. Deposits and withdrawals will be resumed as soon as possible after this upgrade. ZEN trading will not be affected. Thank you for your understanding and continued support. ZEN 3.0.0 introduces side chain support to zen node network. Learn more: https://github.com/HorizenOfficial/zencashjs/tree/v2.0.1#migrating-from-1x-to-2x