{
  "manageEntity": {
    "action": "Save",
    "entityId": "1883394996",
    "entityType": "Track",
    "nonce": "0x507d4eb002f9366f9f777ec1af4d8600ff487a4d7c693dd00f78c3908c3c11f6",
    "signature": "0xf411ea30e583439192960f061ff447d29dd64b0e56d3d2d738e220487dd2def0086c3f75b76d8ff7217d57f34c04e54a89485c8b1144a7554e72030d73e52f251b",
    "signer": "0x5452f86EfcB1153FF9C10bdbe4103Ce25434D124",
    "userId": "620307004"
  }
}