So did mthcl and CfB already fix this vulnerability:
This is the scenario I'm talking about. Green filled, black edged are transactions of the honest network. Red edged - are transactions of the attacker. The doublespends are filled with yellow.
As far as I understand your algo, weight of the red tip is greater by 3 than weight of the green tip.
?As far as I understand your algo, weight of the red tip is greater by 3 than weight of the green tip.
Why would the weight of the red tip be greater (not saying it can't be) ? Afaik tips only have their "own weight" since they are tips and therefore haven't "inherited" any weight yet. Which afair means that their weight depends on the POW of those tx (tips).