Large amount of BTC moved around time of hack
Just under 1% of all Bitcoin held in Pat-to-script-hash (P2SH) addresses was moved at or around the time of the Bitfinex hack.
You can see the drop here https://snapshot.raintank.io/dashboard/snapshot/5IL74enaj3THSTX1d6VO3MNy9lTxQLNy
source: https://twitter.com/julianor