Method for automatically providing cryptocurrency to recommender using propagation on sns

A blockchain-based cryptocurrency transaction system, comprising:

• at least one blockchain holder node;
• a platform server configuring and storing a member terminal group and configured to allow a blockchain transaction between terminals included in the member terminal group and not to allow a blockchain transaction with a terminal not included in the member terminal group;
• a first terminal included in the member terminal group;
• and
• at least one second terminal connected with the first terminal via the platform server, wherein
• the first terminal transmits a recommendation request including an identity (ID) of the at least one second terminal to the platform server, wherein
• in response to the recommendation request, the platform server includes the second terminal corresponding to the ID in the member terminal group and transmits an amount of cryptocurrency corresponding to a number of IDs received from the first terminal, wherein
• when a blockchain transaction occurs between the first terminal and the second terminal, a processing request including the blockchain transaction is transmitted to the platform server, wherein
• in response to the processing request, the platform server transmits the blockchain transaction to the at least one blockchain holder node, wherein
• the at least one blockchain holder node verifies validity of the blockchain transaction according to a blockchain algorithm and transmits a result of the verification to the platform server, and the platform server confirms the blockchain transaction.