{
  "manageEntity": {
    "action": "Save",
    "entityId": "291859728",
    "entityType": "Track",
    "nonce": "0x643b5c2d6e9fa0cfdfb8a07e974002ecacdd22127de861e98cebf9c69bc475cb",
    "signature": "0x8eada8f3bdb2d10bdd9eb6cdff04645063f70ff032e11d40dc6c593592c740900330a076d34c743d5b4b6de685354a7090c74fd77d0f488e55075b3b08f9f7ba1b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}