{
  "manageEntity": {
    "action": "Save",
    "entityId": "879147642",
    "entityType": "Track",
    "nonce": "0xa769632e2571b0940026aef958f9924793d497bccfbb88ade7972ce4d2ec0730",
    "signature": "0xc3bafa5805879443f39e092d57f54269bc0eb78c1e7cbec463f16ebacf06403f1ded2678fa67f3266ab68723073f8250b7382d272198caebff4021fd8b70fdd31c",
    "signer": "0x45c4f1dcE13eeF476C74C5758696D56137253980",
    "userId": "824478223"
  }
}