Partial Slashing about casper

[vbuterin]

What is recently_slashed for?

The intention is to slash validators by an amount proportional to the percentage of other validators that were slashed around the same time. recently_slashed is the numerator.

Aah, sorry, I think it's meant to be equal to total_slashed[withdraw_time] - total_slashed[withdraw_time - 2 * withdrawal_delay]

How the numbers(2 and 6) are decided in (total_slashed[withdraw_time] - total_slashed[withdraw_time - 2 * withdrawal_delay]) * 6?

The 2 basically means that if you commit a violation at time T, you're slashed based on the portion of validators that misbehaved between time [T - withdrawal_delay, T + withdrawal_delay]

The 6 makes the slashing 100% if 16.667% of validators are slashed. Originally the interval was [T - withdrawal_delay, T] which meant that if 1/3 were slashed due to the attack, the validators that are slashed first would lose less, making the attack 25% less costly; if the denominator was more forgiving (eg. 3) then the attackers would lose far less. Now that the interval wraps around in both directions, I actually would favor decreasing the 6 to a 3.

[lounlee]

I have a few questions.

• What is recently_slashed for?
• How the numbers(2 and 6) are decided in (total_slashed[withdraw_time] - total_slashed[withdraw_time - 2 * withdrawal_delay]) * 6?

I think I need to read articles(if exist) about the reasoning behind slashing conditions and parameters including this, like sharding spec. Where can I find it?

[djrtwo]

addressed in #115