{
  "manageEntity": {
    "action": "Save",
    "entityId": "1670899087",
    "entityType": "Track",
    "nonce": "0x5763b20795dd79e3653087d6ada115da15f5dc23d319d4ab5c14688a20044406",
    "signature": "0xb96eae63583cece2268940106fc3428050c3cb418b69cbb3a887e31dbb4827235b4dade5459d62e36ed524f8e0e3b911aad7c227268b6c3b1b62fc3538b1bb6b1b",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}