$BTC - Bitcoin 

W1: first impulsive wave (5)

W2: first corrective wave (3)

W3: second extended impulsive wave (5)

W4: second extended corrective wave (3)

W5: next up

W2 and W4 tend to alternate between a relative sharp and flat correction:

W2: retraced to <0.272 retracement of W1 (Sharp)

W4: retraced to 0.5 retracement of W3 (Flat)

Invalidation: Whenever W4 enters territory of W1, i.e. price drops below $13.8k