{
  "manageEntity": {
    "action": "Save",
    "entityId": "685581906",
    "entityType": "Track",
    "nonce": "0x0af0bd7f887d802c7dae30103a7bc414a689526a4544ff3b3b3350563cec4ad7",
    "signature": "0x05a2cd9146377eb463ce10eb2b0dcf701d12f569e710a35ff0ec4d43050f5f632679e6848f54163adc9d01cb34bb427d4b584bcb1d17ec6a8a7ad1e321bc4d4b1b",
    "signer": "0x73317E9D44b6E1b7d146760b12dc5546Cd140ED2",
    "userId": "683609933"
  }
}