{
  "manageEntity": {
    "action": "Save",
    "entityId": "2137584504",
    "entityType": "Track",
    "nonce": "0xb13f582e43ec8334119a90612a4f2330a39070230d32bac193b049681c1dc3a5",
    "signature": "0x9eae5b870f8b0865c240d542aeb1b330ea3fbcb20bdf2e0117b6900d5ee31aa52320513e29a50a1f3e1992d5022baeab7727b83e8bffc8f6219a5de23c4c7d7c1c",
    "signer": "0x21Fd9B00abe46D332aD583DED844CE1b04f07047",
    "userId": "397438294"
  }
}