Data transaction privacy protection method and device based on block chain, and medium

The invention discloses a block chain-based data transaction privacy protection method and apparatus, and a medium, and can be widely applied to the technical field of block chains. According to the invention, after the transaction receiver and the transaction sender calculate the random seed according to the common knowledge, the transaction temporary key pair is calculated according to the random seed, so that both parties of the transaction can obtain the key pair, and privacy information leakage caused by the fact that a temporary public key is attached to the transaction is prevented; according to the method and the system, a transaction temporary key pair is obtained, a shared key is calculated according to the double-key pair and the transaction temporary key pair, and then a transaction temporary address is calculated according to the shared key and the double-key pair, so that a receiver only needs to compare the address with a temporary address in a block chain to confirm that the receiver is an aut