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Re:CBOE Will Start Bitcoin Futures Trading on December 10 by destructaball on Monday December 04, 2017 @10:21AM (#15844456)
30% is far too small of an initial margin for such a volatile commodity.

The initial margin is expected to cover a the movement of an observable through making the margin call, the period of time the margin call could be filled, declaring the counter-party in default and closing out the position. This normally adds up to a minimum of 2 working days.

Saying that it's beyond the realms of possibility for bitcoin to jump or fall 30% in 2 days seems ridiculous.

Re:CBOE Will Start Bitcoin Futures Trading on December 10 by tome on Monday December 04, 2017 @12:12PM (#15845455)
The highest daily volatility ever was 15% and it's currently around 4%, according to https://bitvol.info/ . Two times the highest daily standard deviation ever doesn't seem so unreasonable.
Re:CBOE Will Start Bitcoin Futures Trading on December 10 by 1053r on Monday December 04, 2017 @12:54PM (#15845875)
That's the highest AVERAGE ROLLING 30 DAY volatility.

For example, on Dec 7, 2013, volatility between the high and the low was 54.6%. [1] However, it was lower for the other days of all 30 day periods that include that day, and averaged out to under 15%.

1 - https://www.coindesk.com/price/

Re:CBOE Will Start Bitcoin Futures Trading on December 10 by baddox on Monday December 04, 2017 @10:30AM (#15844533)
Do you have any data on what the largest 48-hour jumps in Bitcoin price have been?
Re:CBOE Will Start Bitcoin Futures Trading on December 10 by pmontra on Monday December 04, 2017 @10:47AM (#15844718)
This could be the largest one in absolute value: according to http://www.xe.com/en/currencycharts/?from=XBT&to=USD&view=1W it went from 11258 USD on November 28 to 9136 on November 29. Then it went up and down again to 9217 on the night of November 30.