{
  "manageEntity": {
    "action": "Save",
    "entityId": "589358997",
    "entityType": "Track",
    "nonce": "0x94d1cbbcc7f41914a5779b91b6fea770647fee72eb1a85a80daa50c46996af49",
    "signature": "0xf5658df5ac1c4f5fffdf2b8ff882bce89a25aca32dff4471313e4114243c46e60cd8046e3a5ffb1cb354eee8134ab1335215e26026456a7ae28b599efad88cfb1c",
    "signer": "0x5fa60F185681545769de01098bB8F29cfbaE3cF0",
    "userId": "489026160"
  }
}