Motion 337 uses a feature added in [a recent substrate PR](https://github.com/paritytech/substrate/pull/8903) to ensure that the staking system maintains a certain level of quality in terms of backing scores. This is **an additional security measure to the staking system being put into place**, as the signed submissions are opening up in the 9080 runtime upgrade. With this motion, all staking solutions provided to the chain (either by offchain workers or signed miners) will need to attain **at least** the score that is specified in this motion. These numbers are obtained by taking the average score of Polkadot/Kusama election for the last 50 eras, and taking their average, then multiplied by 50% to take into account network variability.

As an example, we know that the current entry barrier of Polkadot's validators set is around 1.69 MDOT. This motion will impose any validator set elected henceforth to present a least-staked validators of at least 847.4 KDOT (50% of the current average). Similarly, we know that the average amount staked in Polkadot now is around 655 MDOT. This motion will ensure that all staking election henceforth will at least put 327.69 MDOT at stake.

Note that these numbers need to be updated on a semi-regular basis, depending on the staking rate of the network. Although, given that (lenient) 50% threshold applied to the scores, we don't expect this to be very often.

Lastly, note that this motion has no impact on the current staking parameters. All validators and nominators continue to operate as they did.
The script used to deduce this motion can be found [here](https://github.com/kianenigma/polkadot-election-score-stats/blob/master/src/index.ts).

**Kusama numbers:**

 - `2152798229052511`, 2.1527 kKSM

 - `2714120481763307659`, 2.7141 MKSM

 - `62184223048402160114561549513680866`, 62.1842 ZKSM

 Set a new value for `MinimumUntrustedScore`.

 Dispatch origin must be aligned with `T::ForceOrigin`.

 This check can be turned off by setting the value to `None`.

- Motion 337 is adding a security measure to the staking system.
- Staking solutions need to have a certain score to be accepted.
- The score is based on the average score of previous elections.
- The motion sets a minimum stake for validators and nominators.
- The numbers may need to be updated occasionally.

#337 Additional security measure on staking system: setMinimumUntrustedScore

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