Update videos.md

booleanfunction · web-flow · commit 00f68232f7c4 · 2021-08-25T13:31:09.000+10:00
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 # Introduction to the Eth2 Phase 0 in Dafny Project
 
 The  following videos provide an introduction to this project, as well as more detailed discussions of several components including the state transition, fork choice and process operations.
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+https://user-images.githubusercontent.com/43776922/130721825-b9418cbd-10c2-4cd7-bf8b-7a36a67d0f4b.mp4
