About the basic concept of block chain It can be easily understood with pictures.
if you insert any text, you can get hash-value !!!
Playstore : https://play.google.com/store/apps/details?id=blockchain.com.hufsbl.hufsbl_study
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Steemit : https://steemit.com/@hufsbl
Korea : 이진형, 전은표, 조길상, 곽도훈, 이경은
Based on the weekly study.
Anyone can easily understand the block chain
Visualize the content in this app