Block chain-based subscription data transmission method and device, equipment and storage medium

The invention discloses a transaction data transmission method, device and equipment based on a block chain and a storage medium, relates to the field of Internet, and can store subscription data to the block chain, and then a subscription system automatically transmits the subscription data to a target service terminal selected by a user. The time for the user to log in the target service platform to upload the subscription data is saved, and the transmission efficiency of the subscription data is improved. The method comprises the following steps: receiving encrypted subscription data, and uploading the encrypted subscription data to a block chain node; when it is detected that first prompt information sent by the block chain node indicates that the encrypted subscription data is successfully stored, sending an extraction request to the block chain node; receiving encrypted subscription data sent by the block chain node, performing data decryption to obtain the subscription data and a target service termina