Create the single outstanding changeset for staging mempool additions and removals.
Declared in <txmempool.h>
[[requires_capability(0x7ff37b4214d8), requires_capability(0x7ff376fd8e88), requires_capability(0x7ff38def80a8), requires_capability(0x7ff3640f90b8), requires_capability(0x7ff3920f93a8), requires_capability(0x7ff37f5cb4c8), requires_capability(0x7ff37d012748), requires_capability(0x7ff374c15f58)]]
std::unique_ptr<ChangeSet>
GetChangeSet();A new changeset bound to this mempool.