{
  "manageEntity": {
    "action": "Save",
    "entityId": "583429881",
    "entityType": "Track",
    "nonce": "0xfcf344bc58f5d76cb9dd17461828073ff9f1929e5ecac770caf5e1f6f9b83e38",
    "signature": "0x136faacb0f3be6b18312a3a71d4abb16260e3699648ae22a2e4a086be4bf06f93b24f07a154c61a1795d2382366dedc071b86c9dfc3efdafe63d55e1b2d67a551c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}