{
  "manageEntity": {
    "action": "Save",
    "entityId": "1539453711",
    "entityType": "Track",
    "nonce": "0xd4a4ba4ff8354f48486611acf4ecf9fb6c41611642d15db8356f058f622e0304",
    "signature": "0xfea2aea4ccf5cbbd34b99be3255e5cb169cd27806def400c567c683275a37bc93fff79cd8514eb02297b692ab341d4574e6ab6e32787e63b6130976bbe7bc98c1c",
    "signer": "0x9B305fd00d9a363195749eec4f162986083A6dC7",
    "userId": "648443373"
  }
}