I noticed gdax has been around 2-2.5% lower than Poloniex this week, and for a brief moment it went to a 5% difference instead. This coupled with Tether at 0.97 per USD suggested that BTC likely was bought at exchanges, transfered ti fiat exchanges (Coinbase) and sold into fiat. We saw a quick burst from $7966 to $8500, which could be the first sign of my suggested support to hold, but I wouldn't call it a confirmation until the 4h candle forms.