{
  "manageEntity": {
    "action": "Create",
    "entityId": "554019815",
    "entityType": "Comment",
    "metadata": "{\"cid\":\"\",\"data\":{\"entity_type\":\"Track\",\"body\":\"Nice\",\"entity_id\":251586,\"track_timestamp_s\":38}}",
    "nonce": "0xb8203421246510f101aec78057847353e180194f1a287d3fdc6c1b6ba2b596dd",
    "signature": "0x976235f17db8085310d1e4aa361f487bd5e789536ae24ab278063bd80c4620b2737dc74357a7f1c4e9d7f6238f0c3c15b18b035ab8e4f3fddab9f4dad47ad19b1c",
    "signer": "0x7Cd44Dc53B13eEA7335A000Ce36c05cDFE34b348",
    "userId": "355113"
  }
}