RE: 비트코인, 블록체인 학습에 필수적인 자료들

[steemitboard]

Congratulations @stunstunstun! You received a personal award!

Happy Birthday! - You are on the Steem blockchain for 2 years!

_{You can view your badges on your Steem Board and compare to others on the Steem Ranking}

Vote for @Steemitboard as a witness to get one more award and increased upvotes!