{
  "manageEntity": {
    "action": "Save",
    "entityId": "399489092",
    "entityType": "Track",
    "nonce": "0xd6b42fac889b4149558935586d6b2c278e8dfbb4e04beec2ce89721ad1755918",
    "signature": "0x13bdae71150cf147c1be633006dce7e435a2c7f02c9837c5c0b469e236f6650d745dbfa5f463993b4771b41fedd517aef3da1fa44206505c51e4a08a7fa7498b1b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}