Block chain verifiable keyword frequency query method and device and storage equipment

The invention discloses a blockchain verifiable keyword frequency query method, and belongs to the technical field of blockchains, and the method comprises the steps: constructing a utility optimization local differential privacy data sharing model of a blockchain, and enabling a data owner to disturb information to be uploaded to a blockchain network; cloud service providers in the data sharing model serve as full nodes to be added into the block chain network, aggregation processing is conducted on the received multiple pieces of disturbed information, and the information is packaged into blocks. The method comprises the following steps: extracting information in each block head in a block chain, performing compression storage by using a CM-sketch technology, and constructing a verifiable data structure in combination with a vector commitment; and on the basis of the verifiable query structure, constructing a query scheme capable of verifying the keyword frequency, querying the occurrence frequency of the k