export interface NostrPowEvent {
    id: string;
    pubkey: string;
    created_at: number;
    kind: number;
    tags: Array<Array<string>>;
    content: string;
    sig: string;
}
export declare function minePow(e: NostrPowEvent, target: number): NostrPowEvent;
export declare function countLeadingZeros(hex: string): number;
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