update 2017 August 30, 19:36 UTC+2:
- another message on the site
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4h ago on twitter:
- "Approximately 5 hours or less left of maintenance. All funds are safe. We just work with hardware."
Right now their site shows:
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Since 3h at least, C-Cex went offline :-(
- you can also trade there GRC normally
On their twitter account they tell:
- "Maintenance require several more hours. Thanks for your patience."