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BCH May 2023 Upgrade: Enforce tx nVersion in consensus rather than standardness


This implements the following CHIP: See discussion here:

Right now, standard relay rules restrict tx.nVersion to either 1 or 2. After May 2023 upgrade, we will also restrict tx.nVersion to be either 1 or 2 as a consensus rule.

Test Plan

  • ninja all check-all

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