Which user role in an IBM Blockchain Platform network manages changes to policies affecting channel creation?

In an IBM Blockchain Platform network, the responsibility for managing changes to policies that affect channel creation lies with the organization administrator. This role is pivotal because the organization administrator oversees the administrative tasks associated with the organization within the blockchain network. This includes defining and managing the membership policies for channels, which dictate how participants can join channels and what governance rules apply.

The organization administrator is also responsible for ensuring that the organization’s configurations align with the network's overall governance model, which encompasses policies related to channel creation. This role involves making decisions about policy updates, allowing for the governance of how channels are structured and operated within the blockchain environment.

While other roles, like network administrators or channel operators, have their designated duties, they do not have the overarching responsibility for policy changes regarding channel creation, making the organization administrator the key role in this context.