Memory stores more data than just when you used tor, like websites visited (like resources downloaded on page load through GETs). Your ISP should only be able to tell what the first node you are using is, and if you use an unlisted bridge it should be much harder to even try to correlate, which if your smart should be near impossible anyways.
Memory stores more data than just when you used tor, like websites visited (like resources downloaded on page load through GETs). Your ISP should only be able to tell what the first node you are using is, and if you use an unlisted bridge it should be much harder to even try to correlate, which if your smart should be near impossible anyways.