{
  "_id": ...,
  "txnNum": ...,
  ...,
  "state": "prepared",
  "affectedNamespaces": [
    "mydb.orders",
    "mydb.inventory"
    ...
  ],
  // New Field
  "m": [
    {"uuid": uuid1, "sz": <int64>, "ct": <int64>},
    {"uuid": uuid2, "sz": <int64>, "ct": <int64>},
    ...
  ]
}