{
  "manageEntity": {
    "action": "Save",
    "entityId": "409204183",
    "entityType": "Track",
    "nonce": "0x9ff9a7fa2537a68126749d6ddb21603daaf13f9c1c1de09562e4352182db05cb",
    "signature": "0x82eaee83fc05c9a79dabd1dade7ade946030729e6f6375aaa300c74e037a18ab44c79bc04bf793bd42a5f01b590c3724ee09547e0d0c27a49c2f21019250774d1c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}