{
  "manageEntity": {
    "action": "Save",
    "entityId": "502578",
    "entityType": "Track",
    "nonce": "0x8b836499440ab325b8567801a36d5b0a333a3e57a7e1c5203189dd19ef62d571",
    "signature": "0xcc01c159175df004c8540cbc0301a55ab55e1492ab92f0799d52cf30c8a6059371ac5f6c0c830b6ca8e8251d8f9dbe95f850a28c0a1983512a43b8bba53886731b",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}