/**
 * Difficulty tiers for PoUW work units.
 * Each tier defines the number of hash operations required.
 */
export declare enum DifficultyTier {
    /** Single leaf hash — ~1-2 seconds of computation */
    Low = "low",
    /** Subtree of 4-16 nodes — ~3-5 seconds of computation */
    Medium = "medium",
    /** Subtree of 16-64 nodes — ~5-10 seconds of computation */
    High = "high"
}
/**
 * Maps difficulty tiers to the number of hash operations (nodes to compute).
 */
export declare const DifficultyTierNodeCount: Record<DifficultyTier, {
    min: number;
    max: number;
}>;
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