{
  "manageEntity": {
    "action": "Save",
    "entityId": "391333045",
    "entityType": "Track",
    "nonce": "0x86b90bd977f44850706c6b27065dddee4617bc11f414942a025f689987f68ae5",
    "signature": "0x3573ecc615081fd30fd2953cb945fdc08dc6b3410a0661c8d36f61be4800b12158be47646adcf87c0fda54e6d2145041f6e4335b2d546bec7d40dce19d9bdccd1c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}