{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xfefe01b3f2d25f66cf713c870bcc9a6968849ed1779816e90291b52bcd9eae30",
    "signature": "0x88fc6120d6a2ba341d71e5d7558a9f7da034da79c49cc2d858496bd6577f05053bd2ff2343bb2f0a70789fd7487c08f0de859d07a0270d6f40e9f3d467557f181c",
    "signer": "0xe146b51A629Fb0fD2E28314C333218882Ef67DF4",
    "userId": "255544284"
  }
}