{
  "manageEntity": {
    "action": "Save",
    "entityId": "1879690828",
    "entityType": "Track",
    "nonce": "0x47d684662aeff87adf78a3bee06773afb30e98534a62b2f3a04df6d48b66a522",
    "signature": "0xfadec1c7e916966018bebe52eee89e37aa152a23d8352a53ccb7e1ba4b92b29320bd61729f16dfdd3354b0cfd5bb846d5416e0b399d9267da6b65b8aa3e6f7c31b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}