{
  "manageEntity": {
    "action": "Save",
    "entityId": "257949469",
    "entityType": "Track",
    "nonce": "0x3025037c147a9a732760e35e7945b42dd2abaa14b92a391bddf884051aa8835f",
    "signature": "0x1b8ed9c0663a20ea78db73d60b02f76dd9353825de9f586e737bc1741d344482090ba6eafc1e5c3c698a2128081cfb49af0963f3b917462adef8d1011ce2f2711c",
    "signer": "0xbe916820AF010608151C80f3A74F7c83218094B2",
    "userId": "881446128"
  }
}