DRUKREF 03 - ESRI:115711

WKT

VERTCS["DRUKREF_03", 
	DATUM["D_Bhutan_National_Geodetic_Datum", 
		SPHEROID["GRS_1980", 6378137.0, 298.257222101]], 
	PARAMETER["Vertical_Shift", 0.0], 
	PARAMETER["Direction", 1.0], 
	UNIT["Meter", 1.0]]

WKT2

VERTCRS["DRUKREF_03", 
	DATUM["D_Bhutan_National_Geodetic_Datum", 
		ELLIPSOID["GRS_1980", 6378137.0, 298.257222101]], 
	CS[vertical, 1], 
	AXIS["Ellipsoidal height (h)", up, 
		LENGTHUNIT["Meter", 1.0]], 
	ID["Esri", "115711"]]

Data from @esri/proj-codes

{
  "wkid": 115711,
  "latestWkid": 115711,
  "macro": "PE_VCS_DRUKREF_03",
  "name": "DRUKREF_03",
  "wkt": "VERTCS[\"DRUKREF_03\",DATUM[\"D_Bhutan_National_Geodetic_Datum\",SPHEROID[\"GRS_1980\",6378137.0,298.257222101]],PARAMETER[\"Vertical_Shift\",0.0],PARAMETER[\"Direction\",1.0],UNIT[\"Meter\",1.0]]",
  "wkt2": "VERTCRS[\"DRUKREF_03\",DATUM[\"D_Bhutan_National_Geodetic_Datum\",ELLIPSOID[\"GRS_1980\",6378137.0,298.257222101]],CS[vertical,1],AXIS[\"Ellipsoidal height (h)\",up,LENGTHUNIT[\"Meter\",1.0]],ID[\"Esri\",\"115711\"]]",
  "description": "DRUKREF 03",
  "authority": "Esri",
  "version": "10.4.0",
  "deprecated": "no",
  "areaname": "Bhutan",
  "extent": {
    "slat": 26.7,
    "nlat": 28.33,
    "llon": 88.74,
    "rlon": 92.13
  }
}