{
  "manageEntity": {
    "action": "Save",
    "entityId": "147364",
    "entityType": "Track",
    "nonce": "0xef30507cbf1b366269a179fd8631480da61ad2a23d0c63d0b327a4325d502366",
    "signature": "0xe4eb53b5f42f279523b9c3b6498ccedeb98f33510f276f6f49861148331b950669553b792d8888f51a2d8e9c66956e471a26bc0175da778ee6e33fbd089734631b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}