{
  "manageEntity": {
    "action": "Save",
    "entityId": "444354497",
    "entityType": "Track",
    "nonce": "0x8804a563fd3ce0028464102bb840edb3270f40f80277642897d772fc376caa19",
    "signature": "0x2f6837225cda174c0a05164478d984ef662a257aee4d44fdb1737916e9f790130b423b8bb216eab66131030b44c4fd7e67bd62ac1067ddf1a7743bab3350a3c01c",
    "signer": "0x4E3828bc809fb5B9deb81fa536cF73Dd5bF4eeB2",
    "userId": "185184169"
  }
}