  In this paper, we propose several solutions to the committee selection
problem among participants of a DAG distributed ledger. Our methods are based
on a ledger intrinsic reputation model that serves as a selection criterion.
The main difficulty arises from the fact that the DAG ledger is a priori not
totally ordered and that the participants need to reach a consensus on
participants' reputation. Furthermore, we outline applications of the proposed
protocols, including: (i) self-contained decentralized random number beacon;
(ii) selection of oracles in smart contracts; (iii) applications in consensus
protocols and sharding solutions. We conclude with a discussion on the security
and liveness of the proposed protocols by modeling reputation with a Zipf law.
