Just went on bittrex slack asked about xvg:
bittrex-julian [1:11 AM]
https://twitter.com/vergecurrency/status/998764810698358786vergecurrency@vergecurrency
it appears some mining pools are under ddos attack, and we are experiencing a delay in our blocks, we are working to resolve this.
TwitterYesterday at 11:17 PM
Yes chain issues so markets and wallets have been shut down