{
  "manageEntity": {
    "action": "Save",
    "entityId": "2047690405",
    "entityType": "Track",
    "nonce": "0x20726804011878c7d84074b8c06ae8dbcdfdc67c020fba42c8403cefb68c0e3a",
    "signature": "0x00a2cf78b4929cc7e6b2db7060d04dab8dd392a6ef219f8744712ed1f5023dc14c2986c18bfa273cbba5f850c274d47d5b28eb45e10fc484255a28dd256cb4a11b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}