Blockchain#28

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msmolyakov wants to merge 6 commits intomasterfrom

Commits on May 12, 2019

ride4dapps blockchain example
msmolyakov
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Commits on May 16, 2019

updated mining; refactor
msmolyakov
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Commits on May 18, 2019

fixed utx processing and mining
msmolyakov
committed

Commits on May 20, 2019

Commits on May 21, 2019

client: fixed bocks sorting
msmolyakov
committed