public static function getCoinSymbolFrom($code, $network)
    {
        foreach (self::COIN_SYMBOL_MAPPINGS() as $coinSymbol => $coinSymbolMapping) {
            if ($coinSymbolMapping['blockcypher_code'] == $code &&
                $coinSymbolMapping['blockcypher_network'] == $network
            ) {
                // Found
                return $coinSymbol;
            }
        }
        return null;
    }