Rate Limiting Nullifier (RLN) is a privacy-preserving and decentralized spam-prevention mechanism for anonymous broadcast networks: each member can emit at most rr signals per epoch, and any violation reveals a secret that enables the member's stake to be slashed. The standard construction binds each membership to a single secret key skG\mathsf{sk}_G, so the unit of identity, the unit of authorization, and the unit of slashing all coincide with one party. This rules out settings in which a group