Request beacon node to provide all validators that are scheduled to propose a block in the given epoch. Duties should only need to be checked once per epoch, however a chain reorganization could occur that results in a change of duties. For full safety, you should monitor head events and confirm the dependent root in this response matches:

• event.current_duty_dependent_root when compute_epoch_at_slot(event.slot) == epoch
• event.block otherwise

The dependent_root value is get_block_root_at_slot(state, compute_start_slot_at_epoch(epoch) - 1) or the genesis block root in the case of underflow.