{
  "manageEntity": {
    "action": "Save",
    "entityId": "1512543310",
    "entityType": "Track",
    "nonce": "0x1fcba5dceab790b0a9795fb8eb9dca870553c2bc597405e7da402de302f6c0ab",
    "signature": "0xec422b6e26e4941a57c5998fcc727674f70aeedb6209ca020e577846fca0cfc00cc18c150917069fc047e4aaefe0f05d73e9548cb61a6bdc1366d1ce15daa5891b",
    "signer": "0xd9bA17330fFb3Ea1356C5eC14971D9e1f2cb5200",
    "userId": "337125448"
  }
}