{
  "manageEntity": {
    "action": "Save",
    "entityId": "1247702650",
    "entityType": "Track",
    "nonce": "0x860fc327093ab41f659a2ca4aab420959a51f47156d6ff4f10f8bd6b97ff6e52",
    "signature": "0xf7bc457f0637ded845b8875ff92319d27e9a6c8a8c8e7d121b580afdd84d451f56265f6f5d63a35c7a2063b0a370c0b228cf03d7b7863c28eeb45f1e9fd2aa601c",
    "signer": "0xbe916820AF010608151C80f3A74F7c83218094B2",
    "userId": "881446128"
  }
}