This proposal closes 7,138 spam bounties on Asset Hub Polkadot created
by exploiting a low BountyDepositBase (~0.002 DOT). The Treasurer origin
calls bounties.closeBounty() on each, slashing proposer deposits to Treasury
and freeing on-chain storage.

Full details, methodology, and call structure: https://hackmd.io/@dhirajs/HJCkrtDRWe