"Automatic Replay Protection
When the median time past [2] of the most recent 11 blocks (MTP-11) is less than UNIX timestamp 1573819200 (Nov 2019 upgrade) Bitcoin Cash full nodes MUST enforce the following rule:
forkid [1] to be equal to 0. When the median time past [1] of the most recent 11 blocks (MTP-11) is greater than or equal to UNIX timestamp 1573819200 (Nov 2019 upgrade) Bitcoin Cash full nodes implementing the May 2019 consensus rules SHOULD enforce the following change:
Update forkid [1] to be equal to 0xFF0002. ForkIDs beginning with 0xFF will be reserved for future protocol upgrades. This particular consensus rule MUST NOT be implemented by Bitcoin Cash wallet software. Wallets that follow the upgrade should not have to change anything."
https://github.com/bitcoincashorg/bitcoincash.org/blob/master/spec/2019-05-15-upgrade.md
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source https://www.reddit.com/r/btc/comments/attqqy/what_does_automatic_replay_protection_mean/
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