{
  "manageEntity": {
    "action": "Save",
    "entityId": "1475719377",
    "entityType": "Track",
    "nonce": "0xf3b9458684e5d5b8bfc9cd2e2b02090f3c666a0de2d14b109dbfbe0a7578c34a",
    "signature": "0xa4beb4f4b5d56a59d1363f7af42550cebb1066e17d8876acac08b8c539977efe1b61ed7487ee0c470e5ff2b29382861e2e9ff390e0dcf5a8a81fde1102157cd31b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}