Between 9th April 2015 and 14th April 2015, WoSign issued 392 certificates with duplicate serial numbers, across a handful of different serial numbers. [https://crt. (It sh/?serial=056d1570da645bf6b44c0a7077cc6769&iCAID=1662 Here is not clear if these were all the same number, or in pairs, or some other combinationone example].) This is documented in their most recent [https://cert.webtrust.org/SealFile?seal=2019&file=pdf BR audit].