{
  "manageEntity": {
    "action": "Save",
    "entityId": "617902",
    "entityType": "Track",
    "nonce": "0x478b56fbd85254ea741dfb60f73b2e6e33345fde1e3c9a8bdcf5e98d9ef45af6",
    "signature": "0x1cf400d531ad45144a756ca70963cd689c3bd728c456519edde7f008e887d2542acb631b3cc26265c495236ed5039be74c9d45fe9c202693b8decdeae668a7ef1b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}