{
  "manageEntity": {
    "action": "Save",
    "entityId": "649956799",
    "entityType": "Track",
    "nonce": "0xb761ba5106380d608fd965366adb31d1029c13e72f9a676aec1d0317239c66c2",
    "signature": "0x2b9bbf30ac8ab77923ca393bd1784d48be5706e39c20fd5e4a8cd178350405c55ef4b36e7582665a3851ec451fa8cee866aa63549b5dec8499817b647b39b2341b",
    "signer": "0x1d868e2cc29848871636BdCF83a08A975835b6DD",
    "userId": "120328011"
  }
}