{
  "manageEntity": {
    "action": "Save",
    "entityId": "478857361",
    "entityType": "Track",
    "nonce": "0xbbb59d64bea9b12943003bca77a9040e8e4441fce850aeedb7b3a4a0c3e93a77",
    "signature": "0xb094544c7accf2b129e83633dc11f195f2ef2478ecb088bb6104adf8bc4167bb2b420b2d7ce332ad9abdd0f554989c34ddc1da5f5fb829e6c536bce773f8592f1c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}