{
  "manageEntity": {
    "action": "Save",
    "entityId": "1957609503",
    "entityType": "Track",
    "nonce": "0x31b7af2ba93b24662b275ad934490c128893986cd114edc5a9157a53ea1920bc",
    "signature": "0x584ae170f8c1255f3c9d8195cc5508cdbbe0e86901aedd28181c5f241569c8757a2aaa6a41e13e8d03573e6583f40761237d772303bba9cc98705eb2dfa7abd61b",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}