{
  "manageEntity": {
    "action": "Save",
    "entityId": "1407616769",
    "entityType": "Track",
    "nonce": "0x7813eb22c9c9022fc121e3a6fc74439799c3e7a3527be53383a5259f8a2d23a9",
    "signature": "0xcea171113561bd2a8184fb1f6c641fd1fed430107b13e729c640a424e29b72252cac139f140ed2119045be64847ed514ef88d6a44e73e36bd1503f70d18fc5691c",
    "signer": "0x0fe82f565AaE260D57b8e691c61Fb05fE83B6F81",
    "userId": "614212580"
  }
}