I finally have some free time to dive deeper into bitcoin studies, so I have a question (or two maybe).
I read an article about lattice attacks when a bad k (nonce) is used. I found some addresses in which the signatures (s part) start with the same bytes, is that a sign that an address has been using a weak nonce?
If the same r is used (exact same nonce) in different transactions, then the formula for calculations would be K((z1*s2 - z2*s1)/(r*(s1-s2))).
What would it be, if the same s is re-used in the formula, but the r's are different?