{
  "manageEntity": {
    "action": "Save",
    "entityId": "489516877",
    "entityType": "Track",
    "nonce": "0xe41d15c7340a48a795eb6de7a6ebd869424456e1843c192206a3f5ec98f1301a",
    "signature": "0x2e7456193d311815210dd04da0e383f3ac400f97a9baaa740e8dd9bc3d8e11155061c5edbb44d60401a7c9a064659087dcb4ce358c83b3ec08e86456c764b9a81c",
    "signer": "0x1EEEf459C8e361773166d5681a5066659BC751D5",
    "userId": "210033902"
  }
}