export type Hex = `0x${string}`;
export interface Signature {
    r: Hex;
    s: Hex;
    v: bigint;
}
export declare function hexStringToBase64(hexString: string): string;
export declare function hexToSignature(hexSig: string): Signature;
export declare function hexToUint8Array(hex: string): Uint8Array;
export declare function hexToDecimal(hex: string): string;
export declare function decimalToHex(decimal: string): Hex;