{
  "manageEntity": {
    "action": "Save",
    "entityId": "348906296",
    "entityType": "Track",
    "nonce": "0x9d8737dbcf3157733339c27daf81f6f7fb9c2cdd7cdc1808f24c7c6e02520278",
    "signature": "0x4c4ca37b8fa81beb93127eea226f2a9df3e9c4e14b6c3e125b679cde522667b47c9c6cf6464d838977d48211e005a8615212b7ca4f6dbc2c6debfbe55e07bb191c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}