#46 Issue 46: [Feature] Grant Proposal "Staking" (Spam Prevention)


Description:
Require grant applicants to "Stake" a small amount of XLM when submitting a proposal. This stake is returned when the grant is approved or rejected by the DAO.
Acceptance Criteria:

[ ] Implement propose_grant() with a mandatory deposit.

[ ] Implement refund_stake() and slash_stake().
Labels: feature, governance