{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x5cb5a775a5fdcfda4b33a7c9446e62f45115093be910a856bea8bc9563da07d8",
    "signature": "0xb2ed4c2f83d858c90573902038d87c2002ff7863d554927bfe0d87fb952f82fb39d2846baaf30137fd1137c59b50bee4f014b431d705dbc22dd4342afd3435f71b",
    "signer": "0x88D453C6A497F83c176bCE8F25e6F00ae8510cA1",
    "userId": "971524822"
  }
}