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Bitcoin ABC has published version 0.16.0 which contains an updated Difficulty Adjustment Algorithm (DAA).
This is a change to the Bitcoin Cash consensus rules. The change activates on November 13th. This is a hard fork, so exchanges, wallets, and other software need to upgrade before November 13th.
The new DAA algorithm seeks to accomplish the following objectives:
- Adjust difficulty to hash rate to target a mean block interval of 600 seconds.
- Avoid sudden changes in difficulty when hash rate is fairly stable.
- Adjust difficulty rapidly when hash rate changes rapidly.
- Avoid oscillations from feedback between hash rate and difficulty.
- Be resilient to attacks such as timestamp manipulation.