/**
 * Cryptographic hash utilities
 */
export declare class HashUtils {
    /**
     * Hash a string using SHA-256
     */
    hash(data: string): string;
    /**
     * Hash an object (JSON stringify first)
     */
    hashObject(obj: any): string;
    /**
     * Compute merkle root from array of hashes
     */
    computeMerkleRoot(hashes: string[]): string;
    /**
     * Generate merkle proof for a leaf
     */
    generateMerkleProof(hashes: string[], leafIndex: number): string[];
}
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