Method of inserting audio-watermark specialized for music usage and NFT and providing music source

A method of inserting an audio watermark specialized for music usage and non-fungible token (NFT) and providing a music source, the method comprising:

• receiving a music source download request from a user who accesses a music source providing system;
• authenticating whether the user is a legitimate user;
• receiving a music source usage purpose from the user when the user is the legitimate user;
• inserting an audio watermark including different types of data information into the music source according to the music source usage purpose;
• performing a music source download requested by the user;
• detecting a usage frequency, a playback time, and a usage purpose of corresponding content in which the music source is used;
• and
• determining a usage fee payment rate based on the usage frequency, a playback time, and a usage purpose of the detected content and paying a usage fee to an owner and an author of the music source.