Bittrex is upgrading Kadena (KDA) wallets to the Single-Key Account Protocol, using the "k" address format. Once the wallet is re-enabled, you will need to generate a new KDA deposit address. See this article for more information on generating a new deposit address.
Please do not deposit any KDA until you have generated your new address. Assets transferred to your old address may not be credited to your account.
Customers who have any questions or need assistance can open a ticket at http://support.bittrex.com.
Further Information:
https://medium.com/kadena-io/introducing-kadena-account-protocols-kip-0012-303462b77af1