{
  "manageEntity": {
    "action": "Save",
    "entityId": "618626782",
    "entityType": "Track",
    "nonce": "0x134d693685d35629e3e99db95d1c7a4659fdc20349ef461f41ac8c5541e154ba",
    "signature": "0x4be2dde9d378e42a44b9f55643bdfc12f55a1c3ae2e6f08ad22564a304e9b90e0c7ccfc7311dfa652ced30387699860f097084af99271b262bef8cc7e2360fe81c",
    "signer": "0x45c4f1dcE13eeF476C74C5758696D56137253980",
    "userId": "824478223"
  }
}