import { Buffer } from 'buffer/index.js';
export declare const sha256Uint8Array: (val: Uint8Array) => Buffer;
export declare function stringToUint8Array(data: any): Uint8Array<ArrayBufferLike>;
export declare const sha256: (val: string) => string;
export declare const sha256buffer: (val: string) => Buffer;
export declare const sha256pow: (source: string, target: string, data: string, user?: string, nonce?: number, iterations?: number, budget?: number, positionalReferenceHash?: string) => {
    data: string;
    datahash: string;
    n: number;
    rotation: string;
    source: string;
    target: string;
    timestamp: number;
    user: string;
}[];
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