{
  "manageEntity": {
    "action": "Create",
    "entityId": "1254448318",
    "entityType": "Comment",
    "metadata": "{\"cid\":\"\",\"data\":{\"entity_type\":\"Track\",\"user_id\":20,\"entity_id\":1739455950,\"body\":\"YES!!!\",\"comment_id\":1254448318,\"track_timestamp_s\":13,\"mentions\":[]}}",
    "nonce": "0x297cb1c711b8da9d23d0815b6aa24dd379cf05814f001a4010d3e7fce9929b1e",
    "signature": "0x9a958e4f4c8f093bf7f42d456723b08080939c849e563cc516be23200441916843de333719f14b84ae0dc69720ae41c386c0c243b6e1f8bbe4a33ee30d30fde11c",
    "signer": "0x040629E31a68119093b9a0111257C8449c2f8e10",
    "userId": "20"
  }
}