{
  "manageEntity": {
    "action": "Save",
    "entityId": "1757866287",
    "entityType": "Track",
    "nonce": "0xe67ecbecfe6375f84f54e7f45aff4d8538e0bd939330376076460a67c4e0d2e9",
    "signature": "0x611cd2d8f3088af541c5b2022834cb1f77a3816701ce5029468ee259d6e97e9872b7d3f786b014dd854a3c1e82c1b0418ecb493e2e3392229d2b929739e450621b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}