{
  "manageEntity": {
    "action": "Save",
    "entityId": "1407616769",
    "entityType": "Track",
    "nonce": "0xb94770054c5c3a9194a8d28c247cce30d7c8a641758782c62054d9c1d9b69a5e",
    "signature": "0xe0304e482325c906234d8b596d89627b55e162be856a333c6da0d16d60fc0de8494c59b59a6756feeff6712729ff6089eaa1713722e4db3d34f33bd7d4ec4d1f1b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}