Date: September 23rd, 2017 4:37 PM
Author: Hairraiser Learning Disabled Laser Beams
i get it from various places.
ive pulled gdax tick level data through their api.
ive gotten historical bitfinex data from this useful site:
https://www.bfxdata.com/
quandl is OK
(http://www.autoadmit.com/thread.php?thread_id=3741213&forum_id=7#34278014)