{
  "manageEntity": {
    "action": "Create",
    "entityId": "271120123",
    "entityType": "Comment",
    "metadata": "{\"cid\":\"\",\"data\":{\"entity_type\":\"Track\",\"user_id\":52309,\"entity_id\":808194482,\"body\":\"cool!\",\"track_timestamp_s\":109}}",
    "nonce": "0x21bdc19f1b316f7e5816a9d9618fd03282881dbd47deba51fc1b90a254a71162",
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    "signer": "0x1CE93c43F8574f553E8071e946654066188B61BC",
    "userId": "52309"
  }
}