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Clarify wipe-out protection

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str4d 2018-02-05 01:30:04 +00:00
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drafts/str4d-overwinter-activation/draft1.rst
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@ -187,15 +187,16 @@ Wipe-out protection
------------------- -------------------
Nodes running upgrade-aware software versions will enforce the upgraded consensus rules from Nodes running upgrade-aware software versions will enforce the upgraded consensus rules from
``ACTIVATION_HEIGHT``. The chain from that height will not reorg to a pre-upgrade branch if any block would ``ACTIVATION_HEIGHT``. The chain from that height will not reorg to a pre-upgrade branch if any block in that
violate the new consensus rules (such as including any old-format transaction). branch would violate the new consensus rules (such as including any old-format transaction).
Care must be taken, however, to account for possible edge cases where the old and new consensus rules do not Care must be taken, however, to account for possible edge cases where the old and new consensus rules do not
differ. For example, if the non-upgraded chain only had empty blocks, and the coinbase transactions were valid differ. For example, if the non-upgraded chain only contained empty blocks from ``ACTIVATION_HEIGHT``, and the
under both the old and new consensus rules, a wipe-out could occur. The Overwinter network upgrade is not coinbase transactions were valid under both the old and new consensus rules, a wipe-out could occur. The
susceptible to this because all previous transaction versions will become invalid, meaning that the coinbase Overwinter network upgrade is not susceptible to this because all previous transaction versions will become
transactions must use the newer transaction version. More generally, this issue could be addressed in a future invalid, meaning that the coinbase transactions must use the newer transaction version. More generally, this
network upgrade by modifying the block header to include a commitment to the ``BRANCH_ID``. issue could be addressed in a future network upgrade by modifying the block header to include a commitment to
the ``BRANCH_ID``.
Example Example