It doesn’t bypass 3rd party cookie rules. You proxy cookie for party3.com I proxy cookie for party3.com But there isn’t a good way for me, you or party3.com

It doesn’t bypass 3rd party cookie rules. You proxy cookie for party3.com I proxy cookie for party3.com But there isn’t a good way for me, you or party3.com to correlate these cookies unless we have some agreed out-of-cookie-band way to do so. I’m sure those will come up, but they will be well known and likely easy to block once they are.