{
  "manageEntity": {
    "action": "Save",
    "entityId": "840125247",
    "entityType": "Track",
    "nonce": "0x1622bf01aa4a0ed104298fa977a25ec4835cbffe5abd27c952d1c5d5527a9b6e",
    "signature": "0x61ab9a7ff96b046e578cf9cba3ceaefa4a8b6eadfe79ef16de2c2de036aca06872339719aeaf58266d8d0bf687e96eab7b6f666d8cf57d84764e0260162585a21c",
    "signer": "0x4dafC3e774A1033C5604372f17ccBDcE545f478D",
    "userId": "889450527"
  }
}