The Macau Health Code application accompanied us through the epidemic. As the Health Code involves cross-border transmission of data and needs to ensure the security of citizens‘ personal data, Infomacro team utilised blockchain technology to encrypt and upload the entire transmission of citizens’ health security and cross-border transcoding data. Over the past two years, Infomacro has used blockchain technology to build up a ‘technological defence’ and win the spring fight against the epidemic.