{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x4cb39356f0625764f822dc86b8a32318a085113500cd0bab825eed5542a27b86",
    "signature": "0x068b651a2e3c150d5b47f3455dd663226ad90f338cca899500cdf388ba4e117b4c6add71b38464f5d54f1c4ef54fd7b1e5a853003c9cece36e70ba594a9f653c1b",
    "signer": "0x5704a6cACD81be1f7Aa2FA1b9B3c575Ad279Bd77",
    "userId": "770031034"
  }
}