[pallet-referenda] Crowd Sourced Decision Deposit

[ggwpez]

Currently the decision deposit for a referendum must be paid in full by a single address. We should add a mechanism that allows it to be crowdsourced. @bkchr suggested that we can re-use the code of the crowdloan-pallet from the Polkadot runtime. I am not familiar with the code of tha pallet but probably needs a new pallet though to manage the deposits.

Requirement:

• It should be possible to split the payment between different addresses (at least 128)
• The code should only consider the n highest amounts paid and refund the lower ones

[runcomet]

Hi @ggwpez, I would like to work on this! Decision deposits could help mitigate some whale activity in OpenGov.

Assigning me would be nice if possible

[ggwpez]

Thanks @runcomet!

[bkchr]

I already have this ready in a branch 😅

[bkchr]

https://github.com/paritytech/polkadot-sdk/tree/bkchr-referenda-deposit-contribute this is my current work. Just misses some benchmarking improvements and more tests.

[apopiak]

https://github.com/paritytech/polkadot-sdk/tree/bkchr-referenda-deposit-contribute this is my current work. Just misses some benchmarking improvements and more tests.

Do you want help cleaning it up? (Looking for bounties projects for PBA graduates)

[bkchr]

Yeah can be taken by someone @apopiak. If you have someone, you can send them to me.

[PolkadotDom]

@apopiak Will take this if you haven't passed it off yet

[apopiak]

Go for it

[runcomet]

@PolkadotDom Still working on this?