This project is based on the block chain as the underlying technology, in order to make 3D printing no longer because of the infringement of intellectual property rights and let people question, protect intellectual property rights, curb fake and shoddy products, enhance the credibility of 3D printing, towards "credible manufacturing". A digital identity is created for 3D printed products, which accompanies the product from the design stage through manufacturing and product delivery, and even monitors the life and destruction of the product based on use. It is equivalent to designing a digital twin for it, tracking 3D products throughout the process, preventing counterfeiting and protecting intellectual property rights. The project uses the non-tamperable and traceable characteristics of block chain information to generate anti-counterfeiting 3D two-dimensional code, and embeds the anti-counterfeiting 3D two-dimensional code into 3D printing STL files, so that the anti-counterfeiting 3D two-dimensional code becomes an integral part of 3D printing products. Users can view the digital certificate of the product by scanning the anti-counterfeiting 3D two-dimensional code, which records the whole life cycle of the product from manufacturing to destruction, and each scan record on the chain deposit certificate. This project is based on the method of making digital identification for 3D printing products based on block chain technology, using the characteristics of non-tamperable and traceable information on the block chain, combined with the 3D two-dimensional code embedded in the product, so that the product has uniqueness and anti-counterfeiting, and is not easy to be destroyed and replaced, improving the anti-counterfeiting performance of the product.