The embodiment of the invention discloses a data processing method and device, computer equipment and a medium, and the method comprises the steps: obtaining target signature information related to business data, and enabling an agent node and a client to carry out the cooperative signature of the business data to obtain the target signature information; obtaining a client certificate of a clientand a node certificate of a proxy node, wherein the node certificate and the client certificate contain the same shared public key, and the shared public key is used for verifying the validity of thetarget signature information; adopting the business data, the target signature information, the node certificate and the client certificate to generate transaction data; and broadcasting the transaction data to a consensus node in the blockchain network so that the consensus node performs consensus on the transaction data, and adding the transaction data to a blockchain of the blockchain network after the transaction data passes the consensus. By adopting the embodiment of the invention, the reliability and safety of data uploading can be effectively improved.