System and method for providing contract support service

A server for providing a contract support service, which connected with a plurality of contractor terminals, an InterPlanetary File System (IPFS), and a blockchain network through a network, the server comprising:

• a communication unit configured to communicate with the plurality of contractor terminals, the InterPlanetary File System (IPFS) and the blockchain network;
• a service management unit configured to manage member information of the plurality of contractor terminals;
• a contract content pre-processing unit configured to acquire audio/video contents including audio/video files in which contract-related audio/video data are stored and metadata for audio/video, in response to a request for contract support from one contractor terminal of the plurality of contractor terminals, generate contract document information corresponding to the contract-related audio/video data, generate a provisional contract content including the generated contract document information and audio/video contents, generate first link information adapted to provide access to the generated provisional contract content and second link information adapted to provide connection with a web page to receive electronic signatures of the plurality of contractor terminals as an input, and control the communication unit to transmit the generated first link information and second link information to the plurality of contractor terminals included in the request for contract support;
• a contract content post-processing unit configured to, when a plurality of electronic signatures are input for each contracting party from the plurality of contractor terminals that have confirmed the provisional contract content, generate audio/video watermarks for the contract content including the provisional contract content and the plurality of electronic signatures, add the generated audio/video watermarks to the provisional contract content to generate a contract content for storage, encrypt the contract content for storage using an encryption key, and control the communication unit to store the encrypted contract content for storage in a distributed manner using the InterPlanetary File System (IPFS) and the blockchain network,
• wherein the metadata for audio/video includes location information and storage time information of the contractor terminal in which storage of the audio/video files was performed.