{
  "manageEntity": {
    "action": "Save",
    "entityId": "499053867",
    "entityType": "Track",
    "nonce": "0x9c57676e8de33416c842abe7150904cf7b7ad1f22a90baf9b2180f4d716b1d8d",
    "signature": "0xd063c3a1888cf753ede3523d0dee056895b8434ac9b6bd410af7206153c6e8956d1c424a9265a90fa0fa775d744add955d097340b53b72c6d0b865a4d1f5b4981b",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}