@RetiredCoder: Since you provided 2 (yes, 2 
) valid signatures for the same address, my humble opinion is that this current mini-puzzle can be solved only if you also leak the relation between the K1 and K2 nonces. 
) valid signatures for the same address, my humble opinion is that this current mini-puzzle can be solved only if you also leak the relation between the K1 and K2 nonces.