{
  "manageEntity": {
    "action": "Save",
    "entityId": "1335675209",
    "entityType": "Track",
    "nonce": "0x72c26dde77c8e13a269ce2ef0bd60da19a982f374d9517d2bbc6274444c458c1",
    "signature": "0x42493fb587a96bcd12a42aa38db4a09a5154ac42e474865506667e3a4b44b85b07db04aa651e4718c4f9e0b5bbde9f2eb327a0ba54832fdc19c77a5dc4ff8b8b1c",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}