//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)
stamp = security("BITSTAMP:BTCUSD", period, close)
finex = security("BITFINEX:BTCUSD",period,close)
kraken = security("KRAKEN:BTCUSD", period, close)
gbtc = security("OTC:GBTC",period,close)

avg = (coinbase+stamp+finex+kraken)/4
diff = ok1w-avg
diff2 = ok3m-avg

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

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