{
  "manageEntity": {
    "action": "Save",
    "entityId": "375880",
    "entityType": "Track",
    "nonce": "0xb10691bf19eab01df2162cc97e5d683da8ae99678aa261c70c9d08c4a0fb5f9b",
    "signature": "0xaa7013f5070d1fcea4b177904dd1052800265c94864bb9e77efd155693400c1464fc1b01749b2dd0de2441b255a9ff8884e33d05a7e2ab3c9f186f1af87077f81b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}