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reject block versions < 4 #1556
The spec currently says that versions < 4 are rejected. We must either do that, or change the spec.
Note that code inherited from Bitcoin might do unintended things for lower block versions; by enforcing this rule, we would be reducing the number of code paths and improving auditability.
The history of block versions in Bitcoin is documented at https://bitcoin.org/en/developer-reference#block-versions .