Lower System Parachain Existential Deposits

[joepetrowski]

As referenced in a few discussions (e.g. forum), the Asset Hub Existential Deposit was set at genesis to 1/10th of the Relay Chain's. The goal however was always to lower it as the Relay Chain became more efficient at executing parachains to reflect the lower resource consumption on parachains and provide stronger incentives to prefer parachains for user-applications over the Relay Chain.

This PR lowers the Asset Hub existential deposits by a factor of ten, to 1/100th of the Relay Chain's ED, or 0.01 DOT.

For discussion/comment: Should all system paras have a lower ED, or just Asset Hub? On one hand, it is less confusing if they are all the same. On the other, we actually don't necessarily want to encourage lots of accounts on a chain like Bridge Hub.

[ggwpez]

For discussion/comment: Should all system paras have a lower ED, or just Asset Hub? On one hand, it is less confusing if they are all the same. On the other, we actually don't necessarily want to encourage lots of accounts on a chain like Bridge Hub. For this PR, I've adjusted all of the system paras, but in separate commits.

Yea i think this is a good point. We can still reduce them if it should be a problem, but only reducing asset hub should already help.

[joepetrowski]

For discussion/comment: Should all system paras have a lower ED, or just Asset Hub? On one hand, it is less confusing if they are all the same. On the other, we actually don't necessarily want to encourage lots of accounts on a chain like Bridge Hub. For this PR, I've adjusted all of the system paras, but in separate commits.

Yea i think this is a good point. We can still reduce them if it should be a problem, but only reducing asset hub should already help.

Yeah, I'm inclined to just do Asset Hub since that's where we want DOT, and having DOT elsewhere should come with some particular motivation. It should be an easy and uncontroversial "win". For UX, wallets/apps should be able to read the ED of the chain they are on and inform users correctly. If there is compelling evidence that this causes problems, we can look at unifying them.

[adamsteeber]

Sorry if this isn't the best place for this or if it is too late being that it's merged already, but would it be possible to also decrease the assets.approvalDeposit on Asset Hub to 0.01 DOT as part of this merge as well?

[joepetrowski]

Sorry if this isn't the best place for this or if it is too late being that it's merged already, but would it be possible to also decrease the assets.approvalDeposit on Asset Hub to 0.01 DOT as part of this merge as well?

The ApprovalDeposit is the existential deposit, so it's not only possible, it's done.
/~https://github.com/polkadot-fellows/runtimes/blob/v1.1.0/system-parachains/asset-hubs/asset-hub-polkadot/src/lib.rs#L263

[ggwpez]

Looks like this is missing a changelog entry and did therefore not appear in the release changelog.

[joepetrowski]

Oops, adding one would trigger a new release though?

[ggwpez]

I will just manually add it for now. PS: done

[bkchr]

Oops, adding one would trigger a new release though?

No. You can open a pr to add it to the CHANGELOG.