Yes, but no posting history has your signature.
It is not legal evidence since electronic text can be modified.
Posting histories are MODIFIED in some cases.
What you “post” online are NOT your posts, but can and have been modified by administrators. That is a fact.
You cannot even tell if the anonymous person is the same person. Case in point is Matt Drudge, it is no longer him.
Internet text is essentially, fake.
Never, ever, accept ANYTHING online is you.