chore: decrease SlashFractionDoubleSign to 2% (backport #2630) (#2666)

This is an automatic backport of pull request #2630 done by
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Co-authored-by: Chirag <[email protected]>

app/default_overrides.go

@@ -98,7 +98,7 @@ func (slashingModule) DefaultGenesis(cdc codec.JSONCodec) json.RawMessage {
 	params.MinSignedPerWindow = sdk.NewDecWithPrec(75, 2) // 75%
 	params.SignedBlocksWindow = 5000
 	params.DowntimeJailDuration = time.Minute * 1
-	params.SlashFractionDoubleSign = sdk.NewDecWithPrec(5, 2) // 5%
+	params.SlashFractionDoubleSign = sdk.NewDecWithPrec(2, 2) // 2%
 	params.SlashFractionDowntime = sdk.ZeroDec()              // 0%
 
 	return cdc.MustMarshalJSON(&slashingtypes.GenesisState{

specs/src/specs/params.md

@@ -44,7 +44,7 @@ are blocked by the `x/paramfilter` module.
 | slashing.SignedBlocksWindow | 5000 | The range of blocks used to count for downtime. | True |
 | slashing.MinSignedPerWindow | 0.75 (75%) | The percentage of SignedBlocksWindow that must be signed not to get jailed. | True |
 | slashing.DowntimeJailDuration | 1 min | Duration of time a validator must stay jailed. | True |
-| slashing.SlashFractionDoubleSign | 0.05 (5%) | Percentage slashed after a validator is jailed for double signing. | True |
+| slashing.SlashFractionDoubleSign | 0.02 (2%) | Percentage slashed after a validator is jailed for double signing. | True |
 | slashing.SlashFractionDowntime | 0.00 (0%) | Percentage slashed after a validator is jailed for downtime. | True |
 | staking.UnbondingTime | 1814400 (21 days) | Duration of time for unbonding in seconds. | False |
 | staking.MaxValidators | 100 | Maximum number of validators. | False |