Bittrex is supporting the Monero (XMR) protocol upgrade on Nov 30, 2019. This is being done to improve privacy and prevent specialized mining hardware from dominating the network.
Before the hard fork, wallets will be closed for deposits and withdrawals at 9:00 AM PST on 11/21/2019 (5:00 PM UTC on 11/21/2019). If any XMR deposits you had sent to Bittrex are not settled by then (marked as pending), you may not be credited with XMR.
Bittrex will re-enable the XMR wallet when we deem the upgrade is satisfactory. Old deposit addresses using the long payment ID will be deprecated as part of the upgrade.
NOTE: Users will need to generate new deposit addresses after the upgrade is complete.
Trading will continue as normal during this time.
We would like to thank the Monero team for working closely with us.