{
  "manageEntity": {
    "action": "Save",
    "entityId": "1704249543",
    "entityType": "Track",
    "nonce": "1786646655940672660",
    "signature": "0x4576f8dcbb339adc3a7d105546516c16057a5e30b20444edd90ff02c9e3ed48061a46a7f7ca058e1168f56076a075da28b439f1c598f51aaffa8f5fc107748ff1c",
    "signer": "0xd30fAF377491796757Ef4C1B0ccA8a407920e663",
    "userId": "451691735"
  }
}