TRON will be upgrading their blockchain from an Ethereum ERC20 token to a new mainnet and blockchain. TRON will retain the balance of the addresses in the new TRON blockchain.
Users' TRON Bittrex exchange balance totals will reflect the same total that they had prior to the swap in a 1:1 manner. The old TRON tokens will no longer be supported or be traded on Bittrex.
Bittrex will re-enable the TRON tokens (TRX) wallet when we and the TRON team agree that the migration is satisfactory.
Note: Bittrex will be closing our TRX wallet and may stop trading the token to take accurate snapshots of balances. If any TRX deposits you had sent to Bittrex are not settled (e.g. marked as pending) by 6:00 PM PT, on 06/20/2018 (1:00 AM on 06/21/2018 UTC), you may not be credited with TRX.
We would like to thank the TRON team for working closely with us.