Re: New transaction malleability attack wave? Another stresstest?
The is an easy rule-of-thumb to spot high-S signatures. For example, the following sig is high-S
This test is not quite precise, so implementers of bitcoin software shouldn't implement the test this way. 
The threshold is not a power of two, so no tidy hex digit sniffing can be precise.It was meant to be a "rule of thumb" for humans -- not a precise test.