{
  "manageEntity": {
    "action": "Save",
    "entityId": "250938",
    "entityType": "Track",
    "nonce": "0x69d9aed0c714ad1914d14d14e5566d63f7d8a2a42355266411e00fc2c16913a1",
    "signature": "0x3ef350ca8f58a9b644a92c0d61b6bb4b0147ed84187ba14ddfca4a0b83f78382038748bdc4eb9d07048329cf7078ff13b2e1e73ce2210ec9570739c9aa0f2a691c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}