Reason for the trading strategy (fundamentally):

Bitcoin spiked suddenly Monday afternoon following news users of the "Cash" mobile payments app could trade the cryptocurrency in New York. The largest cryptocurrency by market capitalization gained more than 4.5 percent to $6,793, its highest since Tuesday, according to CoinDesk's bitcoin price index. Bitcoin was trading near $6,694 as of 3:56 p.m. ET. Cash is owned by Square and has 7 million monthly active users, the company said in its first-quarter earnings call. On Monday, New York's Department of Financial Services granted Square a virtual currency license, allowing users of the Cash app in the state to trade bitcoin. Bitcoin trading launched for most Cash users in late January.

Reason for the trading strategy (technically):

BTC/USD is approaching its resistance at 6854 (100% Fibonacci extension, 38.2% & 78.6% Fibonacci retracement, horizontal swing high resistance) where we look to sell on strength with an anticipation of a move down to its support at 6571 (61.8% Fibonacci extension, horizontal overlap support).

Stochastic (34, 5, 3) is approaching its resistance at 89% where a corresponding reversal is expected.

Sell below 6854. Stop loss at 6972. Take profit at 6571.