HBN (Healthcare Blockchain Network): Medical data held by each medical institution are different in size and standard and are stored individually. Because the size of clinical records recorded in electronic document form is small, it is expected to be about megabytes. However, medical images can be tens or hundreds of megabytes. Since it is unreasonable to store all of this data in the blockchain, it is connected to individual medical institutions by nodes and immediately transmitted to the LEMONCHAIN ecosystem as soon as a patients' medical data is needed.

Community System: In the LEMONCHAIN ecosystem, there is a healthcare-related Decentralized Autonomous Organization (DAO) called a community. The community is a blockchain-based autonomous organization, and when rules are set through smart contracts, tokens are distributed to members of the community. When determining the direction of operation of the community, distribution of profit structures, and policies, the right to vote can be exercised as much as the token holds.

1) Personalized Healthcare and Medical Counseling Center: When Lemon City (LEMONCHAIN metaverse) users have health-related questions, they can receive free health consultations with doctors at the metaverse counseling center. They can freely consult and manage their health through paid services by hiring the doctor they want as their doctor in the metaverse for a certain period. Lemon City doctors basically receive five tokens (LEMC) per one health consultation. If users are satisfied with a doctor's consultation, they will give their doctors a high grade, and then doctors can promote their hospital.