If your operate a Waves node, please update to version 0.7.7

https://github.com/wavesplatform/Waves/releases/tag/v0.7.7

Click here to see what version your node is running at: http://dev.pywaves.org/generators

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And did you already register an alias for your Waves address?

Click here for inspiration: http://dev.pywaves.org/aliases