http://d7w3gz2atjwmvxtjr32j4rwskgro7vsyxvzt4l2bivcrtbos3drkjcqd.onion/how-monero-works
Each is replaced by a Pedersen commitment C = a·G + v·H , where v is the amount, a is a random blinding factor, and G and H are two independent generators. The blinding makes C reveal nothing about v , yet commitments still add , so the network can verify that inputs and outputs balance without seeing a single amount.