Fix INACTIVITY_PENALTY_QUOTIENT

The amount of inactivity penalty was adjusted to half since we were applying penalty for missing FFG target and source. But now we only apply it for missing target, so `INACTIVITY_PENALTY_QUOTIENT` should be `2**24`.
ethereum · Apr 8, 2020 · c10e59b · c10e59b
1 parent 2a36f36
commit c10e59b
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diff --git a/configs/mainnet.yaml b/configs/mainnet.yaml
@@ -122,8 +122,8 @@ BASE_REWARD_FACTOR: 64
 WHISTLEBLOWER_REWARD_QUOTIENT: 512
 # 2**3 (= 8)
 PROPOSER_REWARD_QUOTIENT: 8
-# 2**25 (= 33,554,432)
-INACTIVITY_PENALTY_QUOTIENT: 33554432
+# 2**24 (= 16,777,216)
+INACTIVITY_PENALTY_QUOTIENT: 16777216
 # 2**5 (= 32)
 MIN_SLASHING_PENALTY_QUOTIENT: 32
 

diff --git a/configs/minimal.yaml b/configs/minimal.yaml
@@ -122,8 +122,8 @@ BASE_REWARD_FACTOR: 64
 WHISTLEBLOWER_REWARD_QUOTIENT: 512
 # 2**3 (= 8)
 PROPOSER_REWARD_QUOTIENT: 8
-# 2**25 (= 33,554,432)
-INACTIVITY_PENALTY_QUOTIENT: 33554432
+# 2**24 (= 16,777,216)
+INACTIVITY_PENALTY_QUOTIENT: 16777216
 # 2**5 (= 32)
 MIN_SLASHING_PENALTY_QUOTIENT: 32
 

diff --git a/specs/phase0/beacon-chain.md b/specs/phase0/beacon-chain.md
@@ -242,10 +242,10 @@ The following values are (non-configurable) constants used throughout the specif
 | `BASE_REWARD_FACTOR` | `2**6` (= 64) |
 | `WHISTLEBLOWER_REWARD_QUOTIENT` | `2**9` (= 512) |
 | `PROPOSER_REWARD_QUOTIENT` | `2**3` (= 8) |
-| `INACTIVITY_PENALTY_QUOTIENT` | `2**25` (= 33,554,432) |
+| `INACTIVITY_PENALTY_QUOTIENT` | `2**24` (= 16,777,216) |
 | `MIN_SLASHING_PENALTY_QUOTIENT` | `2**5` (= 32) |
 
-- The `INACTIVITY_PENALTY_QUOTIENT` equals `INVERSE_SQRT_E_DROP_TIME**2` where `INVERSE_SQRT_E_DROP_TIME := 2**12 epochs` (about 18 days) is the time it takes the inactivity penalty to reduce the balance of non-participating validators to about `1/sqrt(e) ~= 60.6%`. Indeed, the balance retained by offline validators after `n` epochs is about `(1 - 1/INACTIVITY_PENALTY_QUOTIENT)**(n**2/2)`; so after `INVERSE_SQRT_E_DROP_TIME` epochs, it is roughly `(1 - 1/INACTIVITY_PENALTY_QUOTIENT)**(INACTIVITY_PENALTY_QUOTIENT/2) ~= 1/sqrt(e)`.
+- The `INACTIVITY_PENALTY_QUOTIENT` equals `INVERSE_SQRT_E_DROP_TIME**2` where `INVERSE_SQRT_E_DROP_TIME := 2**12` epochs (about 18 days) is the time it takes the inactivity penalty to reduce the balance of non-participating validators to about `1/sqrt(e) ~= 60.6%`. Indeed, the balance retained by offline validators after `n` epochs is about `(1 - 1/INACTIVITY_PENALTY_QUOTIENT)**(n**2/2)`; so after `INVERSE_SQRT_E_DROP_TIME` epochs, it is roughly `(1 - 1/INACTIVITY_PENALTY_QUOTIENT)**(INACTIVITY_PENALTY_QUOTIENT/2) ~= 1/sqrt(e)`.
 
 ### Max operations per block