{
  "manageEntity": {
    "action": "Save",
    "entityId": "920057015",
    "entityType": "Track",
    "nonce": "0x8ad03c1004d3a6ef052f11f3abadf9cf75fe38b76266095e1395636a57a948c3",
    "signature": "0xbe385c221007cf7b27d675cf9c859f076e686f56c561d3bc7dab862608c0cb2946f8eb1befc32993bb4cd8491f489a5b3074a8487509db7b21b435e805499c641b",
    "signer": "0xa0C10F709D3c5b2b5FecDEA05B821Ac58bF0c782",
    "userId": "641492277"
  }
}