It is here https://vomtom.at/upgrade-smart-contracts-on-chain/

Great article!
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罗远航
Jack Tanner
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1 min read·
Apr 30, 2018
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It is here https://vomtom.at/upgrade-smart-contracts-on-chain/
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Written by Jack Tanner502 Followers
·17 Following
Blockchain and self-sovereign identity software developer and educator! https://jackandtheblockstalk.com
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