{
  "manageEntity": {
    "action": "Save",
    "entityId": "486602575",
    "entityType": "Track",
    "nonce": "0xa7b19d85e125af742bde3255d9fface8a89e604e26235a4561062c43ebe90487",
    "signature": "0xfe3d02019590dedac816b1d1d6dac392362067c56e0dd377d305219f93fd53622541dd7ae4d335366a36bcb2f03c7f498460c11a72dffe7b3b990b8ed53a70031c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}