Create the single outstanding changeset for staging mempool additions and removals.
Declared in <txmempool.h>
[[requires_capability(0x7fb95f557638), requires_capability(0x7fb968bc8d48), requires_capability(0x7fb95fdd2b88), requires_capability(0x7fb978b77f48), requires_capability(0x7fb96b8fd4a8), requires_capability(0x7fb96e5c3f78), requires_capability(0x7fb97a07dfa8), requires_capability(0x7fb96be45cf8)]]
std::unique_ptr<ChangeSet>
GetChangeSet();A new changeset bound to this mempool.