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# 6.1.1 ERC-721 SOT NFT 스마트 컨트랙트

각 SOT 토큰에는 다음 정보가 포함되어 있다:

A. 위치 데이터: 위치 데이터에는 위도 및 경도, 국가 및 도시의 3가지 주요 정보가 포함됨.

B. UUID: 모든 SoT에는 OpenSea 항목 페이지에 적힌 고유 UUID (Universally Unique Identifier-범용고유식별자)가 있으며 메타데이터로도 포함된다. UUID는 SOT가 설치된 나라의 UN 코드 3글자와 5자리 식별번호를 조합하여 형성된다. 예를 들면, 대한민국에서 발행되는 첫 번째 SOT NFT 토큰의 UUID는 KOR00001이다.

Grade: SOT는 5가지의 등급(S/A/B/C/D)으로 나누어지는데, 각 등급은 SOT의 일일 평균 조사 참여자 등에 따라 바뀔 수도 있다.


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