{
  "manageEntity": {
    "action": "Save",
    "entityId": "571662793",
    "entityType": "Track",
    "nonce": "0xf7761c7357ae48f5fbba4ed99e8aec43633c5d49f1357dda029ee80346621798",
    "signature": "0xcfe74fa88fee9a8b20eb5d0aafc999c4ee286de991d1b438db44f980ca2f5c9367f4f40aae6649904d85b05aee2de4698c64ec8a99c35ca31f21918b37e75a6c1c",
    "signer": "0xd708949D0521A856Ca6eB44B4112bAEE59741ADD",
    "userId": "490478463"
  }
}