Account abstraction (WIP)

[barnabee]

Summary of account abstraction feature for discussion and design and spec work.

tl;dr:

1. Add multisig support with:
   • ability to update signer account IDs
   • ability to change signing threshold
   • ability to separate controller account ID (could be the same or a diff. multisig or single user) and signer accounts
   • multisig account ID can be used anywhere (?) a normal pubkey can be
2. Add fund accounts with:
   • separation of "investor", "controller", and "fund manager/trader" roles (account ID, each can be a multisig, at least investors can be other fund accounts, though with a general abstraction all 3 could be)
   • tracking of users' share of fund NAV
   • optional rules for how long it takes to remove funds
   • ability to apply a "2 and 20" style fee (fraction of NAV per period X + fraction of gains net of losses from prior periods per period X) to be sent to any account ID of fund creator's choosing (can be multisig or another fund)
   • ability to restrict "investors" to a limited set of account IDs or leave open to all
   • ability to cap total "invested" or close to new money coming in
   • ability to restrict the fund to a subset of assets/markets/funds
   • ability to restrict the fund to a subset of trader/LP/fund investor roles
   • fund account ID can be used anywhere (?) a normal pubkey can be as long as not restricted by fund rules
   • delay for changing fund rules >= delay for redemption?
3. Ability to create a "meta" account that allows other accounts do a a rules based subset of activities
   • rules control other accounts ability to act "as" the meta account for any normal tx type
   • can therefore subdivide one "meta" account to diffrent accounts for each type of rule set / responsibility
   • can restrict to specific tx types, markets, assets, etc.

[barnabee]

Thinking about it, we can probably live without item 3 of the tl;dr in the first instance, though I'd need to discuss with some MMs and other community members to understand the specific needs of their use cases better.