//Futures & GBTC Vs Spot

study(title = "Futures & GBTC Vs Spot", shorttitle = "Futures & GBTC Vs Spot")

len=input(5, minval=1)

ok3m = security("OKCOIN:BTCUSD3M",period, close)
ok1w =security("OKCOIN:BTCUSD1W",period, close)
coinbase = security("COINBASE:BTCUSD",period,close)
usdcnh = security("FX_IDC:USDCNH",period,close)
btccny = security("OKCOIN:BTCCNY",period,close)
finex = security("BITFINEX:BTCUSD",period,close)
gbtc = security("OTC:GBTC",period,close)

avg = (coinbase+finex)/2
diff = ok1w-avg
diff2 = ok3m-avg
diff3 = ((gbtc*1000)-avg)

col = diff<0 ? red : diff>0 ? green : gray
col2 = diff2<0 ? red : diff2>0 ? green : gray

hline(0,title="0")
plot(diff3, style=area,linewidth=2,color=white)
plot(diff2, style=area,linewidth=1,color=aqua)
plot(diff, style=area,linewidth=1,color=yellow,transp=25)