{
  "manageEntity": {
    "action": "Save",
    "entityId": "203858132",
    "entityType": "Track",
    "nonce": "0x738da0e022308c8600519e3792b6d29c86eca8ff7ecbffb9d2aa3b24418872a4",
    "signature": "0x270bb090c7374f2b2fe0c2702010697f077db37ebbf41bc47b9febd91a35a0676109db5195742bdb96bd43a6b003b95b9f586e220b074ce407b18f13b8977e431b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}