3D printing digital model authentication method and system based on block chain

The invention relates to a 3D printing digital model authentication method and system based on a block chain, and the method comprises the steps: carrying out the recognition of a file format through uploading a 3D digital model file; reading coordinates of the 3D digital model, modifying a specified 3D coordinate axis, storing an Euclidean distance generated between modified coordinate information and coordinate information of a source file, generating an independent 3D model ID, encrypting user ID information and the generated 3D model ID by using a Hash algorithm, and storing the encrypted information into a block chain. Simultaneously generating a pair of public key and private key; returning the generated public key and the encrypted file to the user; authenticating the uploaded 3D digital model file, and returning original information of the 3D digital model file after the authentication is successful; if the authentication is invalid, the user uploads the authentication file again; infringement is conf