{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x9c4c057c2c369ac37e97d60c93f024af15f2b4113b5a98ea578ad59660cb87b2",
    "signature": "0x15eca4da9681980f4828267531f23837ebbe8f94a103c97d296ca54a4cce6a2b0c043a98eb22e3bf418794ab0449300c64c32373d572e54c95e8ab4c892c27521c",
    "signer": "0xe8BAaf9d67869BFe993951C60524b67BC331bac9",
    "userId": "75683930"
  }
}