{
  "manageEntity": {
    "action": "Save",
    "entityId": "337782369",
    "entityType": "Track",
    "nonce": "1785396120682547396",
    "signature": "0xa24f4c4a12efe65f9a6097666544bc91fe741b6885bf74f07412a36a51dd1c872347997124abfce28353dccb428af735cd755e2e4e509a9589659cd8ec95cb301b",
    "signer": "0xd30fAF377491796757Ef4C1B0ccA8a407920e663",
    "userId": "451691735"
  }
}