{
  "manageEntity": {
    "action": "Save",
    "entityId": "123909",
    "entityType": "Track",
    "nonce": "0xd3604c4442e2290ad7f870ce2615369cff7db90dfc5dd90c4ace2c5be81b3c31",
    "signature": "0xe7b1c7908ad8503d417971920e1c16cfcafee8488edbd42db4991be53aa259357de7c7f92d8b377d6fc467f476e8391b9373f474ba6ff21eeb51ea7ba58098621c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}