{
  "manageEntity": {
    "action": "Save",
    "entityId": "755809958",
    "entityType": "Track",
    "nonce": "0x5fd0d6687dc9e82309a2691b33ebec7cd4ae743d27b570cbd9704215ba8e1ccd",
    "signature": "0xdd3e8266d2cda399e3586076b3db12876bcdd818a4c6a734ff4cde3fa263e9273673d0c78b0e45e6d967d2bf1202862efe1ac6eb180dd1cb57b047bbdfb393651c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}