Fake diploma problem is getting worse because the industry of diploma forgery has been emerging. Someone could take advantage of counterfeit degrees to find a decent job. Therefore, the fake diploma problem is urgent to many different walks of life. The existing anti-forgery methods for traditional diplomas cannot eradicate the disgraceful behavior of malicious. In 2016, Blockcerts project based on bitcoin blockchain is proposed to serve as an unforgeable place for storing legitimate certificates. However, the verifier needs to obtain the JSON file from students, which incurs inconvenient and privacy issue. In this paper, we proposed a practical and privacy-preserving diploma notarization platform based on smart contracts in Ethereum blockchain. Combined with the tailored QR code technique, the proposed platform can get rid of the JSON file in verification process, which means the better privacy of digital diploma and the more convenient in many scenarios. Moreover, the multiple content inspections for a diploma proposal are another security feature of our platform to avoid the corruption problem of the single school administrator. Our platform is adapted to issue the digital diplomas for elementary schools in Taichung County in Taiwan.
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