{
  "manageEntity": {
    "action": "Save",
    "entityId": "818461442",
    "entityType": "Track",
    "nonce": "0xfc44a3f87a2727a80f13d15e2ef77cc7d19c19a2cc7ae958709f04bb313bb15c",
    "signature": "0xcbc917ecedc6f1e918a08a13496f3a4558d8fa2042cd63e865c34c9e815f95e3380034706729af868446cd92a5dc5d4cd4bae6529cd4dad65f07f8cc8340de291b",
    "signer": "0xF7628Ea36C0C266E289b7538b033fB949A6C31ff",
    "userId": "386745392"
  }
}