{
  "manageEntity": {
    "action": "Save",
    "entityId": "899789441",
    "entityType": "Track",
    "nonce": "0x743a372a5daf2ff7be828a3a1cd929fd7bc12b57d9e6854d4355895e10159513",
    "signature": "0xe80df6f69ee78ed11cdfc8b7f9711575c1b70625c5caee8be4cad93088805a15160d7a548d91c884d0ad22f8da85d5d05a1107f620b2a9c145292765b67741251c",
    "signer": "0x36d29AA5C780341f3b35bDE6c1411a7Abcf8794C",
    "userId": "571117272"
  }
}