/**
 * Returns the pico equivalent of the hrp multiplier as a BN object
 *
 * For instance:
 *   since m (milli) is 0.001 bitcoin, this is the equivalent of
 *   1000000000 or 1e9 pico bitcoin.
 *
 * @param hrpMultiplier
 * @return returns the BN pico bitcoin value
 */
export declare function hrpToPico(hrpMultiplier: string): bigint;