export declare class UtilCryptoService {
    rpcMethods: (((value: any) => boolean) | ((numWords?: number) => string) | ((phrase: any) => Uint8Array<ArrayBuffer>) | ((hex: string) => string))[];
    constructor();
    mnemonicGenerate(numWords?: number): string;
    mnemonicToMiniSecret(phrase: any): Uint8Array<ArrayBuffer>;
    isBase64(value: any): boolean;
    /**
     * Generate a revocation registry id: 32 CSPRNG bytes as 64 hex chars,
     * WITHOUT the 0x prefix.
     */
    generateRegistryId(): string;
    hexToString(hex: string): string;
}
export declare const utilCryptoService: UtilCryptoService;
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