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The linked article does mention that work towards the transition has effectively been in progress since before Ethereum even launched. If you're talking about
by pcthrowaway 4y ago
The linked article does mention that work towards the transition has effectively been in progress since before Ethereum even launched.
If you're talking about when it started being claimed that it was happening soon, the beacon chain launched at the end of 2020, so probably 2019/2020 sometime.