getSibling
Sibling node index of treeNode. Even nodes sit to the right of their sibling (so the sibling is to the left, -1); odd nodes sit to the left (sibling to the right, +1). From merkle_get_sibling.
Sibling node index of treeNode. Even nodes sit to the right of their sibling (so the sibling is to the left, -1); odd nodes sit to the left (sibling to the right, +1). From merkle_get_sibling.