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The concerns over NFT copyright protection have created a need for significant research to find ways to stamp/mark copyrighted insignia and unique characters into digital media, within an NFT. The technology is named both x
(Sound Copyright Marking System). 
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is an NFT authentication system that permanently entrenches a special frequency within audio, video files by an inclusive data addition, where there are no visual and/or auditory effects on the data itself.

The both x digital sound marking system, includes the exploitation of a specific audio frequency to digitally stamp the audio within an NFT, that is legible to read/view at a visual level, using a regular sound analyser. The result developed by bothx®️ audio visual research and development studio, proves the effectiveness, usefulness, global applications, security and uniqueness of the technology. (Patent app# PCT/IB2020/056103)