On 17 January, 2018 a peculiar sell order on Poloniex for the ZEC<->BTC trading pair was noted on Twitter:
Also that day, a similarly peculiar sell order was created for the LTC<->BTC trading pair and noted by the same Twitter account:
At the time of this post, the total ZEC in circulation is 3,084,994 so therefore the 3.9M+ sell order is inaccurate.
This issue appears to be limited to Poloniex and we’ve detected no problems on the Zcash blockchain. That said, we’re monitoring the situation and we’ve reached out to Poloniex to see if we can help.
We’ll update this post with a link to Poloniex’s statement when they make one.