{
  "manageEntity": {
    "action": "Save",
    "entityId": "386469",
    "entityType": "Track",
    "nonce": "0x759f3f647263489ea33eda28c5c2486ada8803dc7ccdb6317aee9101bd37b19a",
    "signature": "0x3e222a31b955dfed094ce59019f27031c6b1992b283c1ea17c48003584b403693bb8c227c93c2260ae29e431c07a4396c6bfa04cbeabba6b0b8fc887da49e9a41c",
    "signer": "0xa8E11aa224d2579f5cbdb912866bCE84Eb10f9dD",
    "userId": "951616224"
  }
}