{
  "manageEntity": {
    "action": "Save",
    "entityId": "1900901343",
    "entityType": "Track",
    "nonce": "0x56dd9183e1f0c87f5c307f1b45fff1c29504a179eadf8b9837c910295765af85",
    "signature": "0x028d4979aa9497d6aaa14e06a3fed9cc9f8a1d0d9b01dfb83e296509583319211abe2e491c641e4d3758092eb22dcbdb0b56298ece9e33ffc466cd8e69c8658a1c",
    "signer": "0xC6f6979d7215C4611Cd7aDb30a42B2812294262c",
    "userId": "55290787"
  }
}