{
  "manageEntity": {
    "action": "Save",
    "entityId": "541519",
    "entityType": "Track",
    "nonce": "0x3fd9d044c019b51e3afaf0c5d960bda52a3090c962dcdb1a3ec374468cbb43f4",
    "signature": "0xcb22d29ddb590b7480cf131b6894e171b1b23d5c641b8a148656b456af1427801349ec3ec33381efbf4a2df4e903340723f59ad36eacdce9f0cf6715e60fa58f1c",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}