Create the single outstanding changeset for staging mempool additions and removals.
Declared in <txmempool.h>
[[requires_capability(0x7f2e1b5a3b08), requires_capability(0x7f2e2721cb18), requires_capability(0x7f2e421ce228), requires_capability(0x7f2e2880d1e8), requires_capability(0x7f2e32130578), requires_capability(0x7f2e347f8c08), requires_capability(0x7f2e2b05d078), requires_capability(0x7f2e2bee4718)]]
std::unique_ptr<ChangeSet>
GetChangeSet();A new changeset bound to this mempool.