Well as we all know that whenever we transact it always go through blockchain first. So is it possible that blockchain can detect illegal trasanction such as buying drugs, guns, hitman etc., especially on deepweb. And where does bitcoin go when blockchain detects a illegal transaction?
No, Bitcoin doesn't work that way. Neither does Blockchain can detect illegal transaction because it simply not possible to disclose illegal transactions. Unless, you know the person that is using that particular Bitcoin address.