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eth2.0-specs/specs/merge/client_settings.md

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The Merge -- Client Settings

Notice: This document is a work-in-progress for researchers and implementers.

This document specifies configurable settings that clients must implement for the Merge.

Override terminal total difficulty

To coordinate changes to terminal_total_difficulty, clients must provide --terminal-total-difficulty-override as a configurable setting.

If TransitionStore has already been initialized, this alters the previously initialized value of TransitionStore.terminal_total_difficulty, otherwise it initializes TransitionStore with the specified terminal_total_difficulty.

Except under exceptional scenarios, this setting is expected to not be used, and terminal_total_difficulty will operate with default functionality. Sufficient warning to the user about this exceptional configurable setting should be provided. here.