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2020-NOV-15 Network Upgrade Specification

Version 0.2, 2020-08-06


When the median time past [1] of the most recent 11 blocks (MTP-11) is greater than or equal to UNIX timestamp 1605441600, Bitcoin Cash will execute an upgrade of the network consensus rules according to this specification.

Starting from the next block these consensus rules changes will take effect:

  • Bitcoin Cash's current difficulty adjustment algorithm will be replaced by a new algorithm named aserti3-2d, referred to as 'ASERT' for short.


The ASERT algorithm is described in full specification: ASERT.

Automatic Replay Protection

Both before and after this upgrade, Bitcoin Cash full nodes and wallets MUST enforce the following rule:

  • forkid [2] to be equal to 0.


[1] Median Time Past is described in wiki. It is guaranteed by consensus rules to be monotonically increasing.

[2] The forkId is defined as per the replay protected sighash specification.