{
  "manageEntity": {
    "action": "Save",
    "entityId": "1574792994",
    "entityType": "Track",
    "nonce": "0x1a87dd857615d242e3ad99a595d545041a87429ebe8bc8fda9ceac9a916a066f",
    "signature": "0xa8bd9867f5c6d52bcc545a4da0dcc05c8019d75970d80aa63973887ecfe3fc6743922e2eebd15961b137d952251d2f031c7d8e4b32aa6d0ad422d5fe53ec7f9c1c",
    "signer": "0x6802Fe39C5FA9f99ac1Aa32F164982185A3E70ea",
    "userId": "152482938"
  }
}