{
  "manageEntity": {
    "action": "Save",
    "entityId": "475331",
    "entityType": "Track",
    "nonce": "0x0fc92fa9c0131a8395b5f29cdedef73c339e83764452276ed80e1a4d00f3749a",
    "signature": "0x6744df16d71282f7b5a55789cd6544883ce8f09c19c92560f9b2c6b9fab3891d1b33e7ca40597dd027eb09fa52f9140861bdeb94e4b84d7a83ef30fa84b7ea361c",
    "signer": "0x9765cbE8e26a2c6c4847C1B69ABeB0B5250EC254",
    "userId": "678556080"
  }
}