The invention provides a data signature. The invention discloses an encryption and storage method, device and equipment, and the method comprises the steps: obtaining the identity verification information of a user, verifying the identity verification information, and if the verification is passed, sending a password obtaining request to preset password processing equipment, so as to obtain key information corresponding to the identity information in the identity verification information; Using the key information to perform signature encryption operation on a preset data file, and obtaining atarget file according to the preset data stored in the block chain, sending the target file to a second electronic device, and storing the preset data file in the block chain, so that the second electronic device carries out tampering verification on the received target file according to the preset data stored in the block chain after obtaining the target file. According to the embodiment of theinvention, the data file is stored in the block chain, and the block chain has a data tamper-proofing function, so that the data security can be improved.