{
  "manageEntity": {
    "action": "Save",
    "entityId": "1903225232",
    "entityType": "Track",
    "nonce": "0x321659df77eeb4deb9825b7d5ca98480a93dd086c49c3da9dbad7917e684f2ed",
    "signature": "0x4d16d8ae9326ea4f9d7bb9a68da61be9df39bfdfd6a75a5953624290430f120c13687830b5ad4ae1efdfea3c20b598a70970e81b19d43b036624b7750a1c2a191c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}