{
  "manageEntity": {
    "action": "Save",
    "entityId": "1612918640",
    "entityType": "Track",
    "nonce": "0x7a751c19286a7574839c87760a09458b66727880f1d2b8ddae4c7b1c1f8f889d",
    "signature": "0x4adca25cc4ab683363aa867612a21171a5029eaa7a5588caed66afeda50612d82753fbf4025993ceb25e33fa079a602c24cbd5090ac95d0b29e53b452d06beba1b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}