{
  "manageEntity": {
    "action": "Save",
    "entityId": "413489",
    "entityType": "Track",
    "nonce": "0xf9b0268b0f9e68f5a6aef4ce983efb239b4e0b2c7f6a69f36bbcaa9d34a3af41",
    "signature": "0x46b599edab45ec556bcd48696b90bda55e263ab499e79593b01283c68712ee9b1003960b2d6d596b15a444cff5e8181b74008e946e46fa6706cd885f4620f7c31b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}