{
  "manageEntity": {
    "action": "Save",
    "entityId": "229987",
    "entityType": "Track",
    "nonce": "0xa5d6ee7498072102a501f4ec93fc7769d939d7b9c8a032caff4bad0598accb1a",
    "signature": "0x91d2678cd1c001d62e993f14df2364dee252554aa7842a094d0f0b26d90d56a04ae06c6afdd7b3c34233de53316494b359e6c3a78a0eb3147de1c8c4a3b078931c",
    "signer": "0x4D8EDeF47b57f98c89BDFf851267B0327BE4cD05",
    "userId": "5307724"
  }
}