{
  "manageEntity": {
    "action": "Save",
    "entityId": "450449",
    "entityType": "Track",
    "nonce": "0x024d8da4dc66ff36aa1b2120fe284f1f7b39b5e578927d673197c1a0d5ea2469",
    "signature": "0x5988167f80f1402fe236d36a030c1f78ffc42366fc98a35436a49e76c0ff49694355ac00891a34ce9e950230f927c27e967a25e60c65569e460795abff25f7771b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}