{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x1f18f50c8eabb50bfb0c922ac3fff7fe6b673e922d10451b71b029d376318712",
    "signature": "0x9a7de50d79b49cf42166dc487c74ee7896ece97a99b5b7483c52e0ced814099c283c5bec325f1531530a43dcca66fcdde8116779050e2a4a5a9c55ad5cc2b9411c",
    "signer": "0xfffF643204D053ae5bFC296Aa20F15313084C719",
    "userId": "473911971"
  }
}