{
  "manageEntity": {
    "action": "Save",
    "entityId": "865996556",
    "entityType": "Track",
    "nonce": "0xb74c210b1dc09ced94d1501f22ec77d3283f260f2d66efdcbe9a921963af0609",
    "signature": "0xccb7b00c1836e177d6909dc749a3a7f12d6d2528509683dfe2fadf9aa23afc6a421d501a723eb1111d43f17b81957a90493ef5885065637765fabf29bc06a2531b",
    "signer": "0x849938DF063059EbF6d907f55E72C083347C9343",
    "userId": "796529120"
  }
}