{
  "manageEntity": {
    "action": "Save",
    "entityId": "338943495",
    "entityType": "Track",
    "nonce": "0xc0457db37a6aafbfb7af5d534297e995fc91557d7795a1a52b18357fe3d9ed2a",
    "signature": "0xc1108d67fa2844db0f93ccb75c783425f7bf726823b9f39979c6080124242f6043236685b574252c7e53aa94e2a52662254fd7a00d0ccb8a0f52d07e59749c3c1b",
    "signer": "0x283a6Fd0bE176865B404dfc3B2805D3a2701d62e",
    "userId": "484365174"
  }
}