Data processing method and device and readable storage medium

The embodiment of the invention provides a data processing method and device and a readable storage medium applied to blockchain network node equipment in a bill reimbursement system. The bill reimbursement system further comprises a user terminal and a reimbursement platform, and the method comprises the steps that a bill reimbursement request submitted by the user terminal is received, and the bill reimbursement request carries a bill identifier of a target bill and a private key signature of the user terminal; if the verification of the private key signature of the user terminal is passed,the target bill and the associated credential information are transmitted from a first multiple signature address corresponding to the user to a second multiple signature address corresponding to thereimbursement platform; and a notification message that the target bill and the associated credential information are transferred is sent to the second multi-signature address to a reimbursement platform so as to notify the re