{
  "manageEntity": {
    "action": "Create",
    "entityId": "1531714823",
    "entityType": "Comment",
    "metadata": "{\"cid\":\"\",\"data\":{\"entity_type\":\"Track\",\"body\":\"flames!\",\"entity_id\":446419159,\"track_timestamp_s\":89}}",
    "nonce": "0x84231eb585ebfd41adb98157fd200a1b6470e1cf63cfbf44dfc5a9785479f9a0",
    "signature": "0x68c91f589d81488a2220fbbc2a024ba5def71606662dbdb0e32454e02d732e7e76541c4996d05c03ce257ff277eeab4aec33add083623244435f7159a01a07991c",
    "signer": "0x040629E31a68119093b9a0111257C8449c2f8e10",
    "userId": "20"
  }
}