{
  "manageEntity": {
    "action": "Save",
    "entityId": "54045213",
    "entityType": "Track",
    "nonce": "0x69788c02c529b08a59a47b817cd8922d91ac01b5c03a7570dc56e61174a9e84b",
    "signature": "0xbc1578e09ae35cc4bec7f1cf83d182d4cffe14915f4341549911a39e4fddfcef212f49a1f19fde15949788226081f146848c1876f30c6ce1bd06241114f6376f1c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}