{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x42635c64ef65bdc58c4806da0b0cc9469125f31fed5bdd8629e8eb3667651d65",
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    "signer": "0x4E6B9e895d4328B1B54C7f3bfe593C72976B9b95",
    "userId": "50459839"
  }
}