{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x5890a3cd6ef9ff694cb1ae4b245be3cb67fb09b630f25a9f53c65a6c6bcb4116",
    "signature": "0x94adc9d99ddc204bd054a9a076350ab4509d9c6b9c5c38503fbe82bf9e37d54a62faa9b627a9ad490b404ddfcbfc29d5e33ae0c153b4e3cc425fa7074d88fb6a1c",
    "signer": "0x2A5FAa19C84dAdAC2355a17b2c6E12Aa3c0014A7",
    "userId": "216889217"
  }
}