{
  "manageEntity": {
    "action": "Save",
    "entityId": "658561200",
    "entityType": "Track",
    "nonce": "0xa1b04a73c8186b35a0617d50c1ecdf89649e8370d0811374010b025cc9792899",
    "signature": "0x565a719b69df33b9ffc236fbbe0f3e76264afc9bf32440f329288fa97d72107b793c27ad052fad053bb8d4885ca6f273d6f09c862b69731a96ddf07198f1caba1b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}