[epic] ✅ Native Group Support

[benjaminbollen]

Native group currencies, user stories

Registering

• a group can register in a graph, and receives a group circle node contract

Trusting

• an avatar can trust a group
  • upon trusting group, its group tokens are 1-1 fungible with yours trustGroup() (simply trust() indiscriminately)
  • upon trusting group, avatar implicitly trusts all the group members trustGroupMembers() #36
• a group can trust a group
• a group can trust an avatar

Path transfers

• if the group has some balances on the trust graph, they are path fungible
• (?) if the group has some balances (group's or avatar's), should group get called upon transfer such that it can selectively block? -- already covered by trust relations?

Wrapping / minting

• mint through explicit call;
• can mint happen after path-transfer - look into pre-/post- hooks on intents
• create callback to group contract to review and adjust the mint (see 0cb9358)

Demurrage

• group tokens have the same demurrage behaviour as avatar tokens

Unwrapping with exit fee

• A clean proposal for redeeming group tokens #34

Burnt collateral for composing group tokens

• if the exit fee was set to 100%, then collateral is burnt upon minting. No unwrapping is possible, but group tokens can be used to mint (other) group tokens

[benjaminbollen]

#24 implements initial proposal for native group circles